2011 ATL Hurricane Season: Coming to an End

[Andrew]

Very interesting to note that the GFS has been hinting at a possible BOC storm sometime next week:

http://mag.ncep.noaa.gov/NCOMAGWEB/appc ... mageSize=M

[srainhoutx]

TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 AM EDT THU OCT 13 2011

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

A BROAD AREA OF LOW PRESSURE...INCLUDING THE REMNANTS OF EAST
PACIFIC TROPICAL DEPRESSION TWELVE-E...EXTENDS FROM SOUTHEASTERN
MEXICO EASTWARD INTO THE NORTHWESTERN CARIBBEAN SEA AND IS
PRODUCING AN AREA OF DISORGANIZED SHOWER AND THUNDERSTORM ACTIVITY.
WHILE TROPICAL CYCLONE DEVELOPMENT IS NOT EXPECTED DUE TO LAND
INTERACTION...LOCALLY HEAVY RAINFALL IS LIKELY DURING THE NEXT
COUPLE OF DAYS OVER PORTIONS OF SOUTHEASTERN MEXICO...THE YUCATAN
PENINSULA...BELIZE...AND GUATEMALA AS THIS SYSTEM REMAINS NEARLY
STATIONARY. THIS SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...OF
BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.

$$
FORECASTER BRENNAN

[wxman57]

Texas is done with any TC threat for 2011. Jet stream is already dipping south into the Gulf. Anything developing by the Yucatan will either track westward into Mexico or get picked up by an approaching front and driven NE toward Cuba and/or the Bahamas.

[srainhoutx]

While there is not a lot of model support for the SW Caribbean disturbance, the Canadian, UKMET and Euro Ensembles are suggesting there may be some credence lending to development in this region over the next several days. Michelle (2001) comes to mind and with Fantasy Fest next week in Key West, it may be something to watch in the days ahead. HPC makes mention as well:

CMC AND UKMET ALONG WITH A CONSIDERABLE NUMBER OF ECMWF ENS
MEMBERS INDICATE THE POTENTIAL OF TROPICAL DEVELOPMENT IN THE NWRN
CARRIBEAN NEXT WEEK.

[Ptarmigan]

I looked at the specific humidity and air temperature anomaly at the 300 millibar level for 2011 from August to September and compared it to 1995, 2005, and 2010 August to October. I noticed that the air is drier at the 300 millibar level in 2011, while it is wetter in 1995, 2005, and 2010. As for air temperature at the 300 millibar level, it is warmer than normal in 1995, 2005, 2010, and 2011.

300 Millibar Specific Humidity Anomaly





300 Millibar Air Temperature Anomaly

[Ptarmigan]

August to September

1990
Air Temperature Anomaly 700 mb


Specific Humidity Anomaly 700 mb


The air temperature at 700 mb level or 10,000 feet is normal to cooler than normal for the most part, but not unusually cold. The air is drier than normal at 10,000 feet especially over the Caribbean and Gulf of Mexico.

Active Season (1995, 2005, and 2010)
Air Temperature Anomaly 700 mb


Specific Humidity Anomaly 700 mb


The air temperature and specific humidity is higher than normal over most of the basin. It is not abnormally warm at 10,000 feet. The level of humidity is abnormally high at 700 mb, which makes it more conducive for tropical development.

2011
Air Temperature Anomaly 700 mb


Specific Humidity Anomaly 700 mb


The air temperature in 2011 is warm at 10,000 feet, but again not unusually warm. However, the specific humidity is higher than normal in the Atlantic and parts of the Caribbean. Those areas saw most of the development. However, Gulf of Mexico is drier, which is no surprise from the ongoing drought. Gulf of Mexico has been hostile in 2011.

[srainhoutx]

The 2011 NATL Hurricane Season via satellite in review from NOAA...

http://www.nnvl.noaa.gov/MediaDetail.ph ... iaTypeID=2

[Ptarmigan]

Active 2011 hurricane season breaks 'Hurricane Amnesia'
http://www.noaanews.noaa.gov/stories201 ... _2011.html

Irene broke the "Hurricane Amnesia". The last hurricane to hit America was Ike on September 13, 2008.