About Jeff Masters
Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters from 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather
By: Dr. Jeff Masters , 3:19 PM GMT on November 07, 2009
Tropical Storm Ida is slowly strengthening, as it heads north-northwest towards an encounter with Mexico's Yucatan Peninsula. Infrared satellite loops show that Ida's heavy thunderstorms are expanding in area, and the cloud tops are cooling, indicating that the updrafts in the storm are growing stronger and pushing higher into the atmosphere. Wind shear is a moderate 15 - 20 knots, and is forecast to remain moderate through Sunday night. SSTs are a warm 29°C, and the total ocean heat content is over 100 kJ/cm^2, which is very favorable for intensification. The rains have ended over Nicaragua and Honduras, and Ida dumped up to eleven inches of rain along the coast in Nicaragua, causing flooding that damaged thousands of homes, but caused no deaths or injuries as of yet.
Figure 1. Satellite-estimated rainfall from Ida. The dark red colors (275 mm) represent rainfall in excess of about eleven inches. Image credit: NASA/TRMM project. Wunderground meteorologist Dr. Rob Carver presents another estimate of Ida's precipitation in his blog today.
The forecast for Ida
The moderate wind shear of 15 - 20 knots should allow for continued slow but steady intensification of Ida through Sunday afternoon, as long as the center remains over water. I give Ida a medium (30 - 50% chance) of reaching Category 1 hurricane strength before arriving at the Yucatan, since the total heat content of the ocean in the Western Caribbean is so high. We'll have a better idea of Ida's current strength early this afternoon, when the Hurricane Hunters have had time to investigate the storm.
The current wind speed probabilities for Cozumel give the Mexican resort island a 46% chance of receiving tropical storm-force winds of 39 mph of higher, Sunday or Monday. The odds of receiving hurricane force winds are given as 3%. Given the current trend in organization of Ida, these numbers should probably be bumped up to about 60% and 5%, respectively.
Once Ida crosses into the Gulf of Mexico on Sunday night, the storm will encounter much cooler SSTs and a strong trough of low pressure that will dump cold air into the storm and bring 40 knots of wind shear. This will cause Ida to lose its tropical characteristics and become a powerful extratropical storm with 45 - 55 mph winds. It is highly unlikely that Ida will hit the U.S. as a tropical storm, but it could still bring tropical storm-force winds of 45 mph to the coast next week as an extratropical storm.
I'll have an update later today, or on Sunday morning.
Jeff Masters
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Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters from 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather
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2900. TedrickMechanical
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2899. portcharlotte
7:37 PM GMT on November 08, 2009I certainly give you credit for seeing this as I do...This storm is not moving northwest or Northnorthwest at 10 or 12 mph..There will be changes unless NHC does not want to admit it
2898. portcharlotte
7:34 PM GMT on November 08, 20092897. kmanhurricaneman
5:23 PM GMT on November 08, 20092896. catastropheadjuster
4:29 PM GMT on November 08, 2009sheri
2895. kanc2001
4:20 PM GMT on November 08, 2009similar setup to the cliche perfect storm of Oct 91
2894. atmoaggie
4:10 PM GMT on November 08, 20092893. weathersp
3:59 PM GMT on November 08, 2009Trying to find it's bearings after forming a complete eyewall
2892. portcharlotte
3:51 PM GMT on November 08, 2009No Movement?
2891. portcharlotte
3:47 PM GMT on November 08, 20092890. stormwatcherCI
3:44 PM GMT on November 08, 2009(KEYW) 24-33N 81-46W 5M
Conditions at
2009.11.08 1453 UTC
Wind from the E (080 degrees) at 22 MPH (19 KT) gusting to 33 MPH (29 KT)
2889. CyberStorm
3:38 PM GMT on November 08, 20092888. fishinfool33825
3:35 PM GMT on November 08, 20092887. portcharlotte
3:35 PM GMT on November 08, 20092886. fishinfool33825
3:32 PM GMT on November 08, 2009I am in complete agreement with this statement. That front was pretty wicked in the PNW with gale force winds and when added to the mix of whats already in the GOM, I shiver at the possibility of the tornado activity this could spawn from S GA all the way down the peninsula.
2885. responderkv
3:31 PM GMT on November 08, 20092884. dearmas
3:30 PM GMT on November 08, 2009My 9yr old has swin also and it is really nasty. The fevers are high.
2883. 1965
3:29 PM GMT on November 08, 2009Totally agree. Suspect there will be a fair amount of tree damage well inland. Tree damage=power failure. People well inland need to keep apprised of this situation, and not have needless deaths as happened in Alabama and Georgia during Opal.
2881. WeatherCaneFF1331
3:26 PM GMT on November 08, 2009i agree
2880. txag91met
3:25 PM GMT on November 08, 20092879. Progster
3:25 PM GMT on November 08, 2009True, but destructive potential increases with the speed of the wind *squared*. 80 kt is 2.5 times more forceful than 50 kt. So while long fetch storm force winds can create significant problems for coastal communities from wave action, and heavy rain is a problem almost everywhere, it is still important to know the track of the area of the strongest winds.
2878. Drakoen
3:24 PM GMT on November 08, 20092877. hurricane23
3:24 PM GMT on November 08, 2009If that, strong westerlies should begin to impact the system pretty dramatically as it approaches the gulfcoast. TS winds could spread onshore as the windfield expands during ET transition.
2876. stormpetrol
3:24 PM GMT on November 08, 2009I think Ida might be headed for SWFL imo, she has slowed a bit from I can tell and resume a more northerly movement, jmo of course.
2875. Cavin Rawlins
3:23 PM GMT on November 08, 2009an advancing upper trough. the BOC is just a surface feature.
Also Ida has a lower pressure than the BOC system, it wont be attracted towards something that has a higher pressure.
2874. WeatherCaneFF1331
3:23 PM GMT on November 08, 2009i live in milton which is just east of p'cola its kinda ironic how my late great great grandmothers name was ida she passed 2 yrs ago ( may she rest in peace ) and now a storm named after her is comming this way.
lmao
2873. stormy2008
3:23 PM GMT on November 08, 2009FORECAST A LARGE BAROCLINIC LOW OFF THE U. S. EAST COAST. IT IS
NOT CLEAR WHETHER THIS IS THE REMAINS OF IDA OR A SECOND LOW THAT
ABSORBS IDA. AT THIS TIME...THE FORECAST USES THE SCENARIO THAT
THIS IS A SECOND LOW THAT ABSORBS THE REMAINS OF IDA."
This may be an interesting thing to watch as well.
2872. IKE
3:23 PM GMT on November 08, 2009CycloneOZ....you picked the perfect spot.
2871. lawntonlookers
3:23 PM GMT on November 08, 2009451 and a few other have been agreeing with that for a couple of days. We will see.
2870. Autistic2
3:22 PM GMT on November 08, 2009Thanks`, I thoiught that was not possible but hey i don't know much about weather patterns expect to stay away from the real powerfull ones.
2869. nrtiwlnvragn
3:22 PM GMT on November 08, 20092868. bjdsrq
3:20 PM GMT on November 08, 2009It ain't exactly "howling", just kind of pleasantly breezy, sunny and dry for now. Nice to have the windows open for the first time since April.
2867. WPBHurricane05
3:20 PM GMT on November 08, 20092866. icepilot
3:20 PM GMT on November 08, 2009Got it just after the post, thanks, and I'm going to start putting the heavy weather bill in effect - lopsided grin
2865. txag91met
3:19 PM GMT on November 08, 20092864. bingcrosby
3:19 PM GMT on November 08, 20092863. Cavin Rawlins
3:19 PM GMT on November 08, 20092862. JamesSA
3:19 PM GMT on November 08, 20092861. Cavin Rawlins
3:19 PM GMT on November 08, 2009extratropical storm with hurricane force winds.
2860. portcharlotte
3:18 PM GMT on November 08, 2009Thanks...the advancing trough will eventually change that northerly flow in the central Gulf to more southwesterly
2859. naplesdreamer28
3:18 PM GMT on November 08, 20092858. mossyhead
3:18 PM GMT on November 08, 20092857. Cavin Rawlins
3:18 PM GMT on November 08, 20092856. IKE
3:18 PM GMT on November 08, 2009NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL112009
900 AM CST SUN NOV 08 2009
THE LAST PASS OF AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT NEAR
1100 UTC SHOWED A CENTRAL PRESSURE OF 983 MB AND AN ELLIPTICAL EYE.
SATELLITE IMAGERY AND RADAR DATA FROM CUBA AND MEXICO SINCE THAT
TIME SUGGEST LITTLE CHANGE HAS OCCURRED IN THE STRUCTURE. BASED ON
THIS AND SATELLITE INTENSITY ESTIMATES OF 90 AND 77 KT FROM TAFB
AND SAB...THE INITIAL INTENSITY REMAINS 80 KT. ANALYSES FROM CIMSS
AT THE UNIVERSITY OF WISCONSIN INDICATE THAT THE HURRICANE IS
CURRENTLY EXPERIENCING ABOUT 20 KT OF SOUTHWESTERLY VERTICAL WIND
SHEAR.
THE INITIAL MOTION IS 325/9. IDA REMAINS BETWEEN A MID/UPPER-LEVEL
TROUGH OVER THE WESTERN GULF MEXICO AND ADJACENT LAND AREAS AND AN
MID/UPPER-LEVEL RIDGE OVER THE EASTERN GULF OF MEXICO AND THE
NORTHERN CARIBBEAN SEA. IN ADDITION...A STRONG LOW-LEVEL RIDGE
COVERS THE NORTHERN GULF OF MEXICO. THE DYNAMICAL MODELS FORECAST
THE TROUGH AND RIDGE TO MOVE EASTWARD...ALLOWING IDA TO TURN TOWARD
THE NORTH DURING THE NEXT 36 HR OR SO. THE GFDL...HWRF...GFS...
ECMWF...AND CANADIAN MODELS ARE NOW FORECASTING A FASTER NORTHWARD
MOTION...WITH THE CENTER OF IDA REACHING THE NORTHERN GULF COAST IN
36-48 HR. THE UKMET AND NOGAPS MODELS CONTINUE TO SHOW A SLOWER
FORWARD SPEED. THE NEW FORECAST TRACK IS FASTER THAN THE PREVIOUS
TRACK THROUGH 48 HR...ALTHOUGH IT IS SLOWER THAN THE GFDL AND ITS
COLLEAGUES. THE FASTER NORTHWARD MOTION ALSO RESULTS IN A MORE
NORTHERLY POSITION FOR THE LATER PART OF THE FORECAST TRACK...SO
THE 72-96 HR POSITIONS HAVE BEEN ADJUSTED NORTHWARD AS WELL.
SOME STRENGTHENING IS POSSIBLE TODAY. AFTER THAT...IDA WILL BE
MOVING OVER COOLER SEA SURFACE TEMPERATURES...INTO A COOLER AIR
MASS...AND INTO STRONGER SHEAR. THE DYNAMICAL MODELS AGREE THAT
EXTRATROPICAL TRANSITION SHOULD BEGIN BY ABOUT 24 HOURS AND IS
LIKELY TO BE COMPLETE IN ABOUT 48 HR. HOWEVER...THE INTENSITY
GUIDANCE FORECASTS HURRICANE-FORCE WINDS THROUGH 48 HR...SO THE
INTENSITY FORECAST MAINTAINS HURRICANE STRENGTH THROUGH THAT TIME.
IN THE 72-120 HR TIME FRAME...THE GFS...ECMWF...AND CANADIAN MODELS
FORECAST A LARGE BAROCLINIC LOW OFF THE U. S. EAST COAST. IT IS
NOT CLEAR WHETHER THIS IS THE REMAINS OF IDA OR A SECOND LOW THAT
ABSORBS IDA. AT THIS TIME...THE FORECAST USES THE SCENARIO THAT
THIS IS A SECOND LOW THAT ABSORBS THE REMAINS OF IDA.
WHILE IT IS LIKELY THAT IDA WILL LOSE TROPICAL CYCLONE
CHARACTERISTICS BEFORE REACHING THE NORTHERN GULF COAST...IT IS
POSSIBLE THAT TROPICAL STORM- OR HURRICANE-FORCE WINDS COULD REACH
PORTIONS OF THE COAST BEFORE EXTRATROPICAL TRANSITION IS COMPLETE.
THUS...A HURRICANE WATCH HAS BEEN ISSUED FOR PORTIONS OF THE
NORTHERN GULF COAST AT THIS TIME. OTHER POTENTIAL HAZARDS
ASSOCIATED WITH IDA ARE...FOR NOW...BEING HANDLED BY LOCAL NATIONAL
WEATHER SERVICE OFFICES ALONG THE GULF COAST IN THEIR PRODUCT SUITE
WITH MARINE AND COASTAL FLOOD WATCHES...WARNINGS...AND ADVISORIES.
FORECAST POSITIONS AND MAX WINDS
INITIAL 08/1500Z 21.2N 86.0W 80 KT
12HR VT 09/0000Z 22.8N 87.1W 85 KT
24HR VT 09/1200Z 25.6N 88.4W 85 KT
36HR VT 10/0000Z 28.2N 88.6W 75 KT
48HR VT 10/1200Z 30.0N 87.8W 65 KT...EXTRATROPICAL
72HR VT 11/1200Z 30.5N 84.5W 40 KT...EXTRATROPICAL INLAND
96HR VT 12/1200Z 30.0N 81.0W 30 KT...EXTRATROPICAL
120HR VT 13/1200Z...ABSORBED BY EXTRATROPICAL LOW
$$
FORECASTER BEVEN
2855. Autistic2
3:18 PM GMT on November 08, 20092854. charlottefl
3:18 PM GMT on November 08, 20092853. stormy2008
3:18 PM GMT on November 08, 2009WTNT41 KNHC 081516
TCDAT1
HURRICANE IDA DISCUSSION NUMBER 18
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL112009
900 AM CST SUN NOV 08 2009
THE LAST PASS OF AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT NEAR
1100 UTC SHOWED A CENTRAL PRESSURE OF 983 MB AND AN ELLIPTICAL EYE.
SATELLITE IMAGERY AND RADAR DATA FROM CUBA AND MEXICO SINCE THAT
TIME SUGGEST LITTLE CHANGE HAS OCCURRED IN THE STRUCTURE. BASED ON
THIS AND SATELLITE INTENSITY ESTIMATES OF 90 AND 77 KT FROM TAFB
AND SAB...THE INITIAL INTENSITY REMAINS 80 KT. ANALYSES FROM CIMSS
AT THE UNIVERSITY OF WISCONSIN INDICATE THAT THE HURRICANE IS
CURRENTLY EXPERIENCING ABOUT 20 KT OF SOUTHWESTERLY VERTICAL WIND
SHEAR.
THE INITIAL MOTION IS 325/9. IDA REMAINS BETWEEN A MID/UPPER-LEVEL
TROUGH OVER THE WESTERN GULF MEXICO AND ADJACENT LAND AREAS AND AN
MID/UPPER-LEVEL RIDGE OVER THE EASTERN GULF OF MEXICO AND THE
NORTHERN CARIBBEAN SEA. IN ADDITION...A STRONG LOW-LEVEL RIDGE
COVERS THE NORTHERN GULF OF MEXICO. THE DYNAMICAL MODELS FORECAST
THE TROUGH AND RIDGE TO MOVE EASTWARD...ALLOWING IDA TO TURN TOWARD
THE NORTH DURING THE NEXT 36 HR OR SO. THE GFDL...HWRF...GFS...
ECMWF...AND CANADIAN MODELS ARE NOW FORECASTING A FASTER NORTHWARD
MOTION...WITH THE CENTER OF IDA REACHING THE NORTHERN GULF COAST IN
36-48 HR. THE UKMET AND NOGAPS MODELS CONTINUE TO SHOW A SLOWER
FORWARD SPEED. THE NEW FORECAST TRACK IS FASTER THAN THE PREVIOUS
TRACK THROUGH 48 HR...ALTHOUGH IT IS SLOWER THAN THE GFDL AND ITS
COLLEAGUES. THE FASTER NORTHWARD MOTION ALSO RESULTS IN A MORE
NORTHERLY POSITION FOR THE LATER PART OF THE FORECAST TRACK...SO
THE 72-96 HR POSITIONS HAVE BEEN ADJUSTED NORTHWARD AS WELL.
SOME STRENGTHENING IS POSSIBLE TODAY. AFTER THAT...IDA WILL BE
MOVING OVER COOLER SEA SURFACE TEMPERATURES...INTO A COOLER AIR
MASS...AND INTO STRONGER SHEAR. THE DYNAMICAL MODELS AGREE THAT
EXTRATROPICAL TRANSITION SHOULD BEGIN BY ABOUT 24 HOURS AND IS
LIKELY TO BE COMPLETE IN ABOUT 48 HR. HOWEVER...THE INTENSITY
GUIDANCE FORECASTS HURRICANE-FORCE WINDS THROUGH 48 HR...SO THE
INTENSITY FORECAST MAINTAINS HURRICANE STRENGTH THROUGH THAT TIME.
IN THE 72-120 HR TIME FRAME...THE GFS...ECMWF...AND CANADIAN MODELS
FORECAST A LARGE BAROCLINIC LOW OFF THE U. S. EAST COAST. IT IS
NOT CLEAR WHETHER THIS IS THE REMAINS OF IDA OR A SECOND LOW THAT
ABSORBS IDA. AT THIS TIME...THE FORECAST USES THE SCENARIO THAT
THIS IS A SECOND LOW THAT ABSORBS THE REMAINS OF IDA.
WHILE IT IS LIKELY THAT IDA WILL LOSE TROPICAL CYCLONE
CHARACTERISTICS BEFORE REACHING THE NORTHERN GULF COAST...IT IS
POSSIBLE THAT TROPICAL STORM- OR HURRICANE-FORCE WINDS COULD REACH
PORTIONS OF THE COAST BEFORE EXTRATROPICAL TRANSITION IS COMPLETE.
THUS...A HURRICANE WATCH HAS BEEN ISSUED FOR PORTIONS OF THE
NORTHERN GULF COAST AT THIS TIME. OTHER POTENTIAL HAZARDS
ASSOCIATED WITH IDA ARE...FOR NOW...BEING HANDLED BY LOCAL NATIONAL
WEATHER SERVICE OFFICES ALONG THE GULF COAST IN THEIR PRODUCT SUITE
WITH MARINE AND COASTAL FLOOD WATCHES...WARNINGS...AND ADVISORIES.
FORECAST POSITIONS AND MAX WINDS
INITIAL 08/1500Z 21.2N 86.0W 80 KT
12HR VT 09/0000Z 22.8N 87.1W 85 KT
24HR VT 09/1200Z 25.6N 88.4W 85 KT
36HR VT 10/0000Z 28.2N 88.6W 75 KT
48HR VT 10/1200Z 30.0N 87.8W 65 KT...EXTRATROPICAL
72HR VT 11/1200Z 30.5N 84.5W 40 KT...EXTRATROPICAL INLAND
96HR VT 12/1200Z 30.0N 81.0W 30 KT...EXTRATROPICAL
120HR VT 13/1200Z...ABSORBED BY EXTRATROPICAL LOW
2852. bjdsrq
3:18 PM GMT on November 08, 2009If this map pans out, NHC is going to be eating crow and begging for "Obama money" like everyone else.
2851. eyesontheweather
3:18 PM GMT on November 08, 20092850. IKE
3:17 PM GMT on November 08, 2009See post 2848.