Dr. Jeff Masters' WunderBlog

Matthew drenching Central America and Mexico
Posted by: Dr. Jeff Masters, 3:35 PM GMT on September 25, 2010 +4
Tropical Storm Matthew continues to dump heavy rains over Honduras, Belize, Guatemala, and neighboring regions of Mexico today. Puerto Barrios, in northern Guatemala, has received 4.57" of rain in the past 24 hours. With Matthew expected to slow down and dissipate by Sunday, the storm's heavy rains of 6 - 15 inches can be expected to cause severe flooding and dangerous mudslides. The rains are of particular concern for Guatemala, which suffered its rainiest August in its history, followed by the landfall of Tropical Depression 11E during the first week of September, which dumped torrential rains on the country that triggered flooding and mudslides that killed at least 48 Guatemalans.


Figure 1. Visible satellite image from NASA's Terra satellite taken yesterday, showing Tropical Storm Matthew approaching landfall.


Figure 2. Forecast rain amounts for the 5-day period beginning at 2am EDT today (Saturday, September 25) as predicted by this morning's 2am EDT (6Z) run of the GFDL. Very heavy rains in excess of eight inches (yellow colors) are predicted for portions of Central America along Matthew's track. Image credit: Morris Bender, NOAA/GFDL.

Lisa
Tropical Storm Lisa pulled a bit of a surprise last night, intensifying into a Category 1 hurricane with 80 mph winds in the far Eastern Atlantic. Lisa's longitude of 27.9W at the time made it the 10th strongest hurricane so far east in the Atlantic. Record keeping began in 1851, but it is likely that many hurricanes stronger than Lisa were missed prior to the advent of reliable satellite coverage in 1974. Lisa is even farther east than Category 4 Hurricane Julia, which earlier this month set the record for strongest hurricane ever recorded so far east. Lisa's glory will be short-lived, though, as strong upper level winds out of the west are expected to increase tonight, bringing high wind shear of 20 - 45 knots over the storm. The high shear may be capable of destroying the storm by early next week. It appears unlikely that Lisa will affect any land areas.

Forecast for the rest of the tropics
Most of the models continue to predict that by Wednesday, the remnants of Matthew, and/or a piece of a tropical disturbance over the Eastern Pacific off the coast of Guatemala, will evolve into a huge and very wet low pressure system that will start spinning over Central America and the Western Caribbean. NHC has been referring to this expected storm as a "monsoon low", and these sorts of storms are very dangerous for Central America and the Western Caribbean, even if they do not develop into a tropical storm. In October 2007, a similar monsoon low I dubbed "the sleeping giant" spent a week spinning over the region, dumping very heavy rains over all of Central America and the countries bordering the Western Caribbean. Rains from this system triggered flooding that killed 45 people in Haiti, damaged thousands of homes in Cuba, and caused havoc in Guatemala, El Salvador, Belize, Mexico, Jamaica, the Cayman Islands, and the Bahamas. A similar type of storm is likely to develop on Wednesday and Thursday, and most of Central America and the nations surrounding the Western Caribbean can expect to see dangerous flooding rains develop this week in association with this giant low. Most of the models also predict that this big low will eventually develop into a tropical storm or hurricane that would be drawn northwards over Cuba late in the week, and threaten the Bahamas, Florida, or the U.S. Gulf of Mexico coast. This is an exceptionally difficult system to forecast correctly, and the models have been coming up with some pretty unusual solutions as to what might happen. We'll just have to wait and see what unfolds over the next few days.

I'll have an update Sunday by 2pm.

Jeff Masters
Categories: Hurricane
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1103. Patrap 12:44 AM GMT on September 26, 2010    
Member Since: July 3, 2005 Posts: 377 Comments: 113014
1104. Patrap 12:44 AM GMT on September 26, 2010    
Member Since: July 3, 2005 Posts: 377 Comments: 113014
1105. muddertracker 12:45 AM GMT on September 26, 2010    
Quoting Patrap:

Gulf of Mexico Near Real-Time Altimeter Viewer

Great link, Patrap! Thank you for posting this one :)
Member Since: August 16, 2007 Posts: 1 Comments: 2169
1106. Patrap 12:45 AM GMT on September 26, 2010    
GOM IR loop

Member Since: July 3, 2005 Posts: 377 Comments: 113014
1107. Patrap 12:45 AM GMT on September 26, 2010    
Quoting muddertracker:

Great link, Patrap! Thank you for posting this one :)


No problemo,..no charge too.
Member Since: July 3, 2005 Posts: 377 Comments: 113014
1108. Patrap 12:46 AM GMT on September 26, 2010    
GOES-12 Atmospheric Imagery


These images are primarily for use in tropical storm monitoring. There are several areas to choose from providing a large-scale view of the Atlantic, down to the Gulf of Mexico. During hurricane season, the hurricanes page provides a variety of GOES atmospheric products to help monitor the active storms.


Member Since: July 3, 2005 Posts: 377 Comments: 113014
1111. Patrap 12:47 AM GMT on September 26, 2010    
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1114. muddertracker 12:48 AM GMT on September 26, 2010    
Does anyone else see spin in that blob below the Fla panhandle?
Member Since: August 16, 2007 Posts: 1 Comments: 2169
1117. PanhandleChuck 12:49 AM GMT on September 26, 2010    
Quoting Patrap:
,,..anything but "Senior" Chuck.,ol Buddy

Im only 50.



I know good ol bud sir... just meant time on blog!
Member Since: May 13, 2008 Posts: 0 Comments: 1189
1118. Patrap 12:49 AM GMT on September 26, 2010    
Now I must relinquish the puter so the wife can do FACEBOOk.

Im out voted again.
Member Since: July 3, 2005 Posts: 377 Comments: 113014
1120. beell 12:50 AM GMT on September 26, 2010    
Quoting NavarreMark:


Take it as a badge of honor. LOL

Just don't take it behind the wheel.

(A free public service announcement)
Member Since: September 11, 2007 Posts: 126 Comments: 13072
1121. TropicalWeatherGrl 12:50 AM GMT on September 26, 2010    
Quoting anyotherliestotell:
looks like florida is safe again. no chance of a cane coming, looks like a tropical wave with some weak little 35 mph winds . . . AT WORST . . . and possibly nothing. heat content dissipating, days getting shorter, sun not at as high an angle . . . season almost over. people have been wishing for a florid a storm for over a MONTH now . . . and still haven't been right. i guess they figure it's too late to admit they were wrong and just hope something happens so as to save some face.


Please tell me...Where are you getting this information from is this true or are you just trying to prove people wrong? If you are serious I would love to know where I can read or find this out? TIA
Member Since: September 20, 2010 Posts: 0 Comments: 132
1124. scott39 12:51 AM GMT on September 26, 2010    
Quoting Dakster:
Are they sure that Matthew is going to slow down... He still seems to be moving quite quickly to the roughly WNW.
It doesnt look like it, but evertime I doubt the NHC they are right. LOL
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1126. shawn26 12:51 AM GMT on September 26, 2010    
Can someone please attach the latest computer model runs?
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1127. Patrap 12:51 AM GMT on September 26, 2010    
Quoting PanhandleChuck:


I know good ol bud sir... just meant time on blog!


Your an old dog here too chuck..

But at least were coherent most da time
Member Since: July 3, 2005 Posts: 377 Comments: 113014
1128. Patrap 12:53 AM GMT on September 26, 2010    
ATCF images (Hurricane Track Models)

Current Storms:
Lisa
Invest95

Now Im really out,,that hurt dear.
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1129. scott39 12:54 AM GMT on September 26, 2010    
Patrap is the NHC back on 6 hours advisories?
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1130. xcool 12:54 AM GMT on September 26, 2010    


18Z GFS ensembles
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1131. MiamiHurricanes09 12:55 AM GMT on September 26, 2010    
Matthew dumping very heavy rain across Guatemala and Mexico.

Member Since: September 2, 2009 Posts: 129 Comments: 20012
1132. muddertracker 12:55 AM GMT on September 26, 2010    


I wasn't kidding about that spin. Link
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1134. PSLFLCaneVet 12:55 AM GMT on September 26, 2010    
Quoting Patrap:
,,..anything but "Senior" Chuck.,ol Buddy

Im only 50.

Wings was a Great Band.



Good link, Pat. Love that song.
Member Since: July 23, 2010 Posts: 0 Comments: 12406
1136. MiamiHurricanes09 12:56 AM GMT on September 26, 2010    
Quoting xcool:


18Z GFS ensembles
They're a little bit further south and later than the operational, but overall pretty good agreement.
Member Since: September 2, 2009 Posts: 129 Comments: 20012
1138. InTheCone 12:56 AM GMT on September 26, 2010    
Quoting shawn26:
Can someone please attach the latest computer model runs?


Here you go... Canefever

this will keep you busy!
Member Since: September 1, 2007 Posts: 0 Comments: 1979
1139. flsky 12:57 AM GMT on September 26, 2010    
Quoting muddertracker:


I wasn't kidding about that spin. Link

Please point out the L/L for the spin.
Member Since: October 24, 2006 Posts: 0 Comments: 1293
1140. TropicalWeatherGrl 12:57 AM GMT on September 26, 2010    
Quoting muddertracker:


I wasn't kidding about that spin. Link


Hello Mudtkr What is that and where did it come from?
Member Since: September 20, 2010 Posts: 0 Comments: 132
1142. muddertracker 12:58 AM GMT on September 26, 2010    
Quoting flsky:

Please point out the L/L for the spin.

86/28?
Member Since: August 16, 2007 Posts: 1 Comments: 2169
1143. sunlinepr 12:58 AM GMT on September 26, 2010    
Member Since: August 2, 2010 Posts: 19 Comments: 8469
1144. PSLFLCaneVet 12:59 AM GMT on September 26, 2010    
Quoting MiamiHurricanes09:
Matthew dumping very heavy rain across Guatemala and Mexico.



Evening, MH09. Matt's putting up a good fight. Bad night for those under the rain shield..
Member Since: July 23, 2010 Posts: 0 Comments: 12406
1146. muddertracker 1:00 AM GMT on September 26, 2010    
Quoting TropicalWeatherGrl:


Hello Mudtkr What is that and where did it come from?
Not sure..I'm going to the NHC site to see if it's a stalled front or something..does anyone else know?
Member Since: August 16, 2007 Posts: 1 Comments: 2169
1149. Patrap 1:01 AM GMT on September 26, 2010    
00z Invest95y Cycle NHC model tracks

Matthew Statistical/Simple Models (CLIPER,BAMs,LBAR,other Statistical Models)




Dynamic Models (More sophisticated models)




Member Since: July 3, 2005 Posts: 377 Comments: 113014
1151. popartpete 1:01 AM GMT on September 26, 2010    
That looks like an incredible amount of thunderstorm activity over the E-Pac, Central America, The Yucatan, and the Western Carribean. Now I can see why the computer models are spitting out possible storms for the upcoming weeks. I heard the pattern will be such that the massive moisture, be it an organized system or not, will work its way up the East Coast. Wow!
Member Since: July 10, 2007 Posts: 0 Comments: 416

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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