August 2017: Looking Back at Harvey 5 Year Later

General Weather Discussions and Analysis
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jasons2k
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Y'all - Beaumont is getting nailed really hard. Prayers for our members out there. It's bad.
ticka1
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prayers sent for our members being affected by harvey's torrential rains!
Ounce
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At 5 a.m., Chita showed radar estimates in the Golden Triangle of 12-15 inches in twelve hours.


-30-

000
WTNT34 KNHC 300851
TCPAT4

BULLETIN
Tropical Storm Harvey Advisory Number 40
NWS National Hurricane Center Miami FL AL092017
400 AM CDT Wed Aug 30 2017

...HARVEY MAKES LANDFALL JUST WEST OF CAMERON LOUISIANA...
...FLOODING RAINS DOUSING EXTREME SOUTHEASTERN TEXAS AND
SOUTHWESTERN LOUISIANA...


SUMMARY OF 400 AM CDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...29.8N 93.4W
ABOUT 5 MI...10 KM W OF CAMERON LOUISIANA
ABOUT 30 MI...50 KM ESE OF PORT ARTHUR TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NNE OR 30 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...990 MB...29.24 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The Tropical Storm Warning and Storm Surge Watch have been
discontinued from High Island, Texas, westward.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Holly Beach Louisiana to Morgan City Louisiana

A Storm Surge Watch is in effect for...
* East of High Island Texas to west of Holly Beach Louisiana

A Tropical Storm Warning is in effect for...
* East of High Island Texas to Grand Isle Louisiana

Catastrophic and life-threatening flooding continues in southeastern
Texas and portions of southwestern Louisiana. Please see warnings
and other products issued by your local National Weather Service
office for additional information on this life-threatening
situation.

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 12 hours in the indicated locations. For a
depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov. This is a life-threatening situation. Persons
located within these areas should take all necessary actions to
protect life and property from rising water and the potential for
other dangerous conditions. Promptly follow evacuation and other
instructions from local officials.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 400 AM CDT (0900 UTC), the center of Tropical Storm Harvey was
located just inland near latitude 29.8 North, longitude 93.4 West.
Harvey is moving toward the north-northeast near 7 mph (11 km/h). A
north-northeastward and then northeastward motion at a faster
forward speed is expected through Thursday night. On the forecast
track, the center of Harvey will move across the Lower Mississippi
Valley and Tennessee Valley through Thursday.

Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Gradual weakening is forecast now that the center has crossed the
coast, and Harvey is expected to become a tropical depression by
tonight.

Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center.

Surface observations indicate that the estimated minimum central
pressure is 990 mb (29.24 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL: Harvey is expected to produce additional rainfall
accumulations of 3 to 6 inches from southwestern Louisiana and the
adjacent border of eastern Texas northeastward into western Kentucky
through Friday with isolated amounts up to 10 inches. While the
threat of heavy rains has ended in the Houston/Galveston area,
catastrophic and life-threatening flooding will continue in and
around Houston eastward into southwest Louisiana for the rest of the
week. The expected heavy rains spreading northeastward from
Louisiana into western Kentucky may also lead to flash flooding and
increased river and small stream flooding. DO NOT ATTEMPT TO TRAVEL
IN THE AFFECTED AREA IF YOU ARE IN A SAFE PLACE. DO NOT DRIVE INTO
FLOODED ROADWAYS. Please see warnings and products issued by your
local National Weather Service office for additional information on
this life-threatening situation.

Elsewhere, the outer bands of Harvey are expected to produce
additional rainfall amounts of 3 to 6 inches over portions of the
central and eastern Gulf States and 2 to 4 inches farther north into
parts of the Tennessee Valley through Friday. These rains may lead
to flooding concerns across these areas.

A list of rainfall observations compiled by the NOAA Weather
Prediction Center can be found at:
http://www.wpc.ncep.noaa.gov/discussions/nfdscc1.html

STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water is
expected to reach the following heights above ground if the peak
surge occurs at the time of high tide...

Holly Beach to Morgan City...2 to 4 ft
San Luis Pass to west of Holly Beach incl. Galveston Bay...1 to 3 ft
Morgan City to Grand Isle...1 to 2 ft

The deepest water will occur along the immediate coast near the
area of onshore winds. Surge-related flooding depends on the
relative timing of the surge and the tidal cycle, and can vary
greatly over short distances. For information specific to your
area, please see products issued by your local National Weather
Service forecast office.

WIND: Tropical storm conditions are occurring over portions of
the warning area along the coast and are likely to persist through
today.

SURF: Swells generated by Harvey are still affecting the coasts of
Texas and Louisiana. These swells are likely to cause
life-threatening surf and rip current conditions. Please consult
products from your local weather office.

TORNADOES: A few tornadoes are possible today and tonight over
parts of Louisiana, Mississippi, southern Alabama, and southeast
Arkansas.


NEXT ADVISORY
-------------
Next intermediate advisory at 700 AM CDT.
Next complete advisory at 1000 AM CDT.

$$
Forecaster Berg
Ounce
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Ch 11 played a tape from sister station in Beaumont recorded early this morning concerning Port Arthur. They were talking to, I believe, the mayor. The mayor said in response to how many houses have water, "Well, we have 18,000 water bills for about 20,000 structures. I can tell you that all 18,000 have water in their homes. And I'm talking to you from my home and it has 3-1/2 feet in it."
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srainhoutx
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Ounce wrote:Ch 11 played a tape from sister station in Beaumont recorded early this morning concerning Port Arthur. They were talking to, I believe, the mayor. The mayor said in response to how many houses have water, "Well, we have 18,000 water bills for about 20,000 structures. I can tell you that all 18,000 have water in their homes. And I'm talking to you from my home and it has 3-1/2 feet in it."
I know radar estimates suggest 15 to 20 inches, possibly higher in some locations across the Beaumont/Port Arthur/Golden Triangle Region over the past 12-18 hours.

For the Houston/Galveston Region. A PNS forthcoming may likely NWS Houston/Galveston may surpass the Hawaii 52" record. We STRONGLY urge everyone to not attempt to go "Site Seeing" today. A massive search/recue effort will continue as well as a Recovery Phase beginning as waters recede in some areas. I know for a fact that there are those that lost their lives in this Catastrophic Flood event. My Brother in law was in Friendswood area yesterday with a boat assisting in the search and recue operations being done by volunteers. It was not a pleasant experience at all and impacted him very deeply emotionally seeing death of those that could not escape the floodwaters. Do not venture too far from home. We all have cabin fever, but let's give our Recue and Recovery Teams a chance to do their work. Those efforts will continue well into the weekend I suspect.
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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srainhoutx
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BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
712 AM CDT WED AUG 30 2017

The National Weather Service in League City has issued a

* Flash Flood Warning for...
North central Harris County in southeastern Texas...

* Until 315 PM CDT Wednesday.

* The Northgate Crossing Municipal Utility No. 1 (The Water
District) has announced that a mandatory evacuation from the Water
District is necessary. This includes the Northwood Pines
Subdivision. It is possible, if conditions continue to deteriorate
at the current rate, you may not be able to leave the Water
District.

* Northwood Pines residents are under an immediate mandatory
evacuation. Please exit the Water District along I-45 south and
proceed to Spring High School located at 19428 I-45, Spring TX
77373 for shelter. To reach Spring high School, exit Cypresswood
Drive and turn left. Spring High School is located on the left.

* Some locations that will experience flooding include...
Northwood Pines Subdivision.

Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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srainhoutx
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Tropical Storm Harvey Local Statement Intermediate Advisory Number 40A
National Weather Service Lake Charles LA AL092017
719 AM CDT Wed Aug 30 2017

This product covers SOUTHWEST LOUISIANA AND SOUTHEAST TEXAS

**CENTER OF HARVEY OVER SOUTHWESTERN LOUISIANA**

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
- None

* CURRENT WATCHES AND WARNINGS:
- A Tropical Storm Warning is in effect for Calcasieu, Jefferson
Davis, Lower St. Martin, and Orange
- A Tropical Storm Warning and Storm Surge Watch are in effect
for Jefferson
- A Storm Surge Warning and Tropical Storm Warning are in effect
for East Cameron, Iberia, St. Mary, Vermilion, and West Cameron

* STORM INFORMATION:
- About 20 miles west-northwest of Lake Charles LA or about 100
miles southwest of Alexandria LA
- 30.2N 93.6W
- Storm Intensity 45 mph
- Movement North or 360 degrees at 9 mph

SITUATION OVERVIEW
------------------

As of 7 AM CDT, Tropical Storm Harvey was 20 miles west-northwest of
Lake Charles, Louisiana. Harvey is moving toward the north at 9 mph.
The storm is expected to move north-northeastward later this morning,
and then a northeastward motion at a faster forward speed is expected
through Thursday night. On this forecast track, the center of Harvey
will exit central Louisiana tonight and will move across the Lower
Mississippi Valley and Tennessee Valley through Thursday.

Widespread catastrophic flooding will continue across southeast Texas
with the potential for flash flooding to increase across extreme southwest
Louisiana and the western part of central Louisiana through Wednesday.
Areas of rain with embedded heavier showers and thunderstorms will continue
west and north of the center of circulation. Isolated tornadoes are also
possible across the area today.

Tropical storm force winds, mainly in the form of gusts, will continue
across Southeast Texas this morning before weakening early in the afternoon.
Across Southwest, South Central, and portions of Central Louisiana,
Tropical storm force wind gusts will continue to develop this morning
and weaken during the late part of the of the afternoon.

Storm surge of 2 to 4 feet above ground level can be expected along
the coast from Holly Beach east to Morgan City, with surge of 1 to
3 feet above ground level expected west of Holly Beach through
Wednesday. Surge will be highest around the times of astronomical high
tides.

POTENTIAL IMPACTS
-----------------

* FLOODING RAIN:
Potential impacts from the flooding rain are still unfolding across
East Texas and extreme Southwest Louisiana. Remain well guarded against
life-threatening flood waters having additional catastrophic impacts.
If realized, these impacts include:
- Extreme rainfall flooding may prompt numerous evacuations and
rescues.
- Rivers and tributaries may overwhelmingly overflow their banks
in many places with deep moving water. Small streams, creeks,
canals, and ditches may become raging rivers. Flood control
systems and barriers may become stressed.
- Flood waters can enter numerous structures within multiple
communities, some structures becoming uninhabitable or washed
away. Numerous places where flood waters may cover escape
routes. Streets and parking lots become rivers of raging water
with underpasses submerged. Driving conditions become very
dangerous. Numerous road and bridge closures with some weakened
or washed out.

Potential impacts from the flooding rain are still unfolding across
Interior Southeast Texas and the western half of Central Louisiana.
Remain well guarded against life-threatening flood waters having possible
limited to devastating impacts.

* WIND:
Potential impacts from the main wind event will continue to develop this
morning across Southwest LOUISIANA and Southeast TEXAS and expand into South
Central and Central LOUISIANA into the afternoon. Remain well sheltered from
hazardous wind having additional limited impacts. If realized, these
impacts include:
- Damage to porches, awnings, carports, sheds, and unanchored
mobile homes. Unsecured lightweight objects blown about.
- Many large tree limbs broken off. A few trees snapped or
uprooted, but with greater numbers in places where trees are
shallow rooted. Some fences and roadway signs blown over.
- A few roads impassable from debris, particularly within urban
or heavily wooded places. Hazardous driving conditions on
bridges and other elevated roadways.
- Scattered power and communications outages.

* SURGE:
Potential impacts from the main surge event are now unfolding across
Coastal Louisiana. Remain well away from life-threatening
surge having possible significant impacts. If realized, these impacts
include:
- Areas of inundation with storm surge flooding accentuated by
waves. Damage to non-elevated structures is possible.
- Sections of escape routes and secondary roads become weakened
or washed out, especially in usually vulnerable low spots.
- Major beach erosion with heavy surf breaching dunes. Strong and
numerous rip currents.
- Moderate damage to marinas, docks, and piers. Several small
craft broken away from moorings, especially in unprotected
anchorages.

Potential impacts from the main surge event are also now unfolding
across Coastal Southeast Texas. Remain well away from locally
hazardous surge having possible limited impacts.

* TORNADOES:
Potential impacts from tornadoes are elevated today across East Texas
and Southwest, South Central, and Central Louisiana today. Remain well
braced against a tornado event having additional limited impacts. If
realized, these impacts include:
- The occurrence of isolated tornadoes can hinder the execution
of emergency plans during tropical events.
- A few places may experience tornado damage, along with power
and communications disruptions.
- Locations could realize roofs peeled off buildings, chimneys
toppled, mobile homes pushed off foundations or overturned,
large tree tops and branches snapped off, shallow-rooted trees
knocked over, moving vehicles blown off roads, and small boats
pulled from moorings.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* EVACUATIONS:

Do not return to evacuated areas until hazardous winds diminish and flood
waters abate.

* OTHER PREPAREDNESS INFORMATION:

Do not be a thrill seeker or risk your life for senseless photos or
videos. Be wise and avoid becoming another statistic.

Continue to keep your cell phone well charged for as long as
possible. If you lose power, use it more sparingly and mainly for
personal emergencies and check-ins. Do not overload communications
systems with idle chatter.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Lake Charles LA around 11 AM CDT, or sooner if conditions
warrant.

Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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srainhoutx
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Jeff Lindner‏ @JeffLindner1 · 41m41 minutes ago
Water levels on Buffalo Bayou between HWY 6 and Dairy Ashford have stabilized and will hold steady #hounews #houwx

Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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srainhoutx
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Jeff Lindner‏ @JeffLindner1 · 46s46 seconds ago
More green than red for the first time in a long time. Recessions on nearly all channels now #houwx #hounews #txwx

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08302017 JEff 1 Tweet DIekUZJVoAAZn3n.jpg
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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Rip76
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Did an actual front come through, or is the ground surface just cooler from all the rain?
Along with the breeze.
Nuby33
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Rip76 wrote:Did an actual front come through, or is the ground surface just cooler from all the rain?
Along with the breeze.
might experience evaporational cooling. you guys all live at the lake now.. lake eerie
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Drier air associated with the Northerly flow on the back side of Harvey will means lower dew points. Refreshing for those involved in Search and Rescue.

Image
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I grew up in Friendswood and that breaks my heart srain. I know Forest Bend and The Forest of Friendswood were probably hit hard and I'm sure just about everywhere in between. Tried just to travel to 528 & Bay Area Blvd yesterday and still couldn't get through the water, plus rescue boats including probably five Game Warden trucks parked along the road. From Dickinson all the way to Spring this storm caused damage and unfortunately cost lives. I really believe people thought they had time and it would be a long duration event, when the real event, at least for us down here, happened on the night of August 26th 27th. That's when we had intense, extremely intense rain where I reside. Unfortunately, despite the many warnings and advisories it still caught people by surprise on how fast the water actually rose.
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srainhoutx
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HGX has made the decision to Extend the Flood Warning and expand it to include areas impacted by rising waters from Rivers, Streams, Creeks, Bayous and Reservoirs/Levees...including our Freeway Systems and surface Roads.

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Houston/Galveston TX
1004 AM CDT WED AUG 30 2017

Jackson TX-Grimes TX-Washington TX-Galveston TX-Montgomery TX-
San Jacinto TX-Houston TX-Brazoria TX-Chambers TX-Waller TX-Polk TX-
Walker TX-Harris TX-Trinity TX-Colorado TX-Wharton TX-Austin TX-
Fort Bend TX-Liberty TX-Matagorda TX-
1004 AM CDT WED AUG 30 2017

The National Weather Service in League City has issued a

* Flood Warning for...
Eastern Jackson County in south central Texas...
Southeastern Grimes County in southeastern Texas...
Southeastern Washington County in southeastern Texas...
Galveston County in southeastern Texas...
Montgomery County in southeastern Texas...
San Jacinto County in southeastern Texas...
Eastern Houston County in southeastern Texas...
Brazoria County in southeastern Texas...
Chambers County in southeastern Texas...
Waller County in southeastern Texas...
Polk County in southeastern Texas...
Walker County in southeastern Texas...
Harris County in southeastern Texas...
Trinity County in southeastern Texas...
Eastern Colorado County in southeastern Texas...
Wharton County in southeastern Texas...
Eastern Austin County in southeastern Texas...
Fort Bend County in southeastern Texas...
Liberty County in southeastern Texas...
Matagorda County in southeastern Texas...

* Until 1000 AM CDT Thursday.

* At 1000 AM CDT, automated rain gauges indicated that heavy rain
had fallen over the area. Multiple rivers, bayous and creeks are
still in flood and surrounging areas around these basins are in
flood. Streets and underpasses still have water in urban areas and
will be slow to drain. These are still life threatening conditions.

* Some locations that will experience flooding include...
Pasadena, Pearland, League City, Sugar Land, Baytown, Missouri
City, Conroe, Galveston Island West End, Galveston Causeway, Texas
City, Huntsville, Friendswood, La Porte, Deer Park, Rosenberg, Lake
Jackson, Alvin, Angleton, Dickinson and Stafford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

A Flood Warning means that flooding is imminent or occurring. All
interested parties should take necessary precautions immediately.

Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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Texaspirate11
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For those who can help in recovery


We are doing a local donation drop off for medical supplies needed for people with disabilities.

DONATIONS NEEDED ASAP. PLEASE HELP!

On Wednesday, August 30, 2017 from 10 a.m. to 3 p.m. we will be welcoming donations for specific items to support our disability community who have been affected by the recent floods. Items can be delivered to West Gray Multipurpose Center located at 1475 West Gray Street, Houston, TX 77019.

Please limit donations to these specific items. All other supplies will need to be turned away.

- wheelchairs
- wheelchair cushions
- walkers
- canes
- catheters
- diapers (children and adult)
- gloves
- bed liners

This effort is in collaboration with The City of Houston and other local nonprofits including Rehabilitation Services Volunteer Project (RSVP) and Ms. Wheelchair Texas.
Just because you're disabled, you don't have to be a victim
Be Weather Aware & Prepared!
Barbara Jordan Winner in Media
Disability Integration Consultant
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DoctorMu
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srainhoutx wrote:Drier air associated with the Northerly flow on the back side of Harvey will means lower dew points. Refreshing for those involved in Search and Rescue.

Image

That's an amazing view. It's remarkable to see harvey still fighting off the dry air.

Thoughts and prayers to all in Houston, Beaumont, and now Louisiana.
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srainhoutx
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mcheer23 wrote:12z GFS is just not what the gulf wants
Let's use the September Topic for this information regarding next week.

http://forums.khou.com/viewtopic.php?f=2&t=2176
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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unome
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some good reads, though heart-wrenching

from Eric Berger:
https://arstechnica.com/science/2017/08 ... -the-same/

Jeff Masters
https://www.wunderground.com/cat6/anoth ... ort-arthur

"A nice summary of how #Harvey happened from the NHC forecaster point of view: From Forecast to Disaster via @NYTimes" thanks to Eric Blake's Twitter feed for this find
https://www.nytimes.com/2017/08/30/us/h ... eline.html
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srainhoutx
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08302017 mcd0768.gif
MESOSCALE PRECIPITATION DISCUSSION 0768
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
212 PM EDT WED AUG 30 2017

AREAS AFFECTED...FAR EAST TX...WEST AND NORTH LA...WEST-CENTRAL MS

CONCERNING...HEAVY RAINFALL...FLASH FLOODING LIKELY

VALID 301810Z - 302310Z

SUMMARY...FLASH FLOODING IS LIKELY TO CONTINUE WITH PERSISTENT
HEAVY RAIN BANDS FROM FAR EAST TEXAS INTO WESTERN LOUISIANA...WITH
ADDITIONAL HEAVY RAIN BANDS POSSIBLY DEVELOPING FROM NORTHEAST
LOUISIANA INTO WEST-CENTRAL MISSISSIPPI.

DISCUSSION...THE DISTRIBUTION OF THE RAIN BANDS IN THE IMMEDIATE
VICINITY OF T.S. HARVEY HAS NOT CHANGED APPRECIABLY IN THE PAST
6-12 HOURS...WITH AN ARCING HEAVY RAIN BAND PERSISTING TO THE WEST
AND NORTHWEST OF THE LOW-LEVEL CIRCULATION CENTER. THIS IS
ASSOCIATED WITH A DEFORMATION ZONE AND ENHANCED CONVERGENCE IN THE
LOW LEVELS...AND HAS A HISTORY OF PRODUCING SIGNIFICANT RAINFALL
IN SHORT PERIODS OF TIME. DUAL POL RAIN RATES OBSERVED BY THE NWS
RADAR NETWORK HAVE GENERALLY BEEN PEAKING IN THE 1.5-2.0 IN/HR
RANGE OVER THE PAST COUPLE HOURS...AND THAT IS CONSISTENT WITH
MRMS RAIN RATES AS WELL.

NON-OPERATIONAL GOES-16 IR CHANNELS REVEAL A LACK OF DEEP
CONVECTION IN THIS REGION AS OF 18Z...AND THAT MAY BE KEEPING THE
RAIN RATES LOWER THAN THE PROLIFIC NUMBERS OBSERVED LAST NIGHT
WHEN DEEP CONVECTION WAS PRESENT. AND THE GOES-16 MICROPHYSICS AND
CONVECTION RGBS GENERALLY CONFIRM WEAKER CONVECTION AS WELL.

THEREFORE RAIN RATES WILL LIKELY BE DEPENDENT UPON WHETHER DEEPER
CONVECTION CAN BE RE-ESTABLISHED CLOSER TO THE CIRCULATION CENTER.
HOWEVER...EVEN PERSISTENCE OF ONGOING RATES OF 1-2 IN/HR WOULD BE
LIKELY TO CONTINUE FLASH FLOODING GIVEN THE VERY SLOW MOVEMENT OF
THE RAIN BANDS AND ALREADY SATURATED SOILS. HOWEVER...AN INCREASE
IN THE RAIN RATES WOULD HAVE THE POTENTIAL TO INCREASE THE
SEVERITY OF THE ONGOING FLOODING...OR LEAD TO NEW AREAS OF
FLOODING AS EVENING APPROACHES. THE HRRR IS NOT KEEN ON THIS
HAPPENING...WITH SIMULATED IR BRIGHTNESS TEMPERATURES REMAINING
RELATIVELY CONSTANT THROUGH 00Z. NEVERTHELESS...HIGH-RES MODEL
GUIDANCE IS IN GOOD AGREEMENT WITH A HEAVY RAIN SIGNAL OVER THE
NEXT 6 HOURS FROM 18-00Z...WITH THE PROBABILITY MATCHED MEAN FROM
THE HREF YIELDING AN ADDITIONAL 4-6 INCHES OF RAIN. THIS IS A
HIGH-CONFIDENCE SIGNAL IN CONTINUED HEAVY RAIN AND FAIRLY
WIDESPREAD FLOODING.

FURTHER TO THE NORTHEAST...MODELS ALSO SHOW THE DEVELOPMENT OF
HEAVY RAIN AS CONVERGENT RAIN BANDS CONTINUE TO DEVELOP IN THE
EASTERN SEMI-CIRCLE OF HARVEY'S CIRCULATION. THESE RAIN BANDS ARE
NARROWER...ONLY 10-20 MILES WIDE AS OF 18Z...AND THUS MAY PROVIDE
A MORE TRANSIENT OR LOCALIZED FLASH FLOODING THREAT.
HOWEVER...TRAINING OF THE RAIN BANDS FOR AN HOUR OR TWO MAY
PRODUCE RAIN RATES HIGH ENOUGH TO GENERATE FLASH FLOODING...AND
THE SPATIAL COVERAGE OF HEAVY RAIN IN THIS AREA MAY EXPAND AS
HARVEY DRIFTS CLOSER.

LAMERS

ATTN...WFO...HGX...JAN...LCH...LIX...SHV...

Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

Member: National Weather Association
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srainhoutx
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Velma and Dr. Neil just called to check in. They are safe and dry. They're keeping a keen eye on the Brazos River Rise, but for now all is well with these Saints.
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

Member: National Weather Association
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