Dr. Jeff Masters' WunderBlog

Western Caribbean disturbance bringing heavy rains
Posted by: Dr. Jeff Masters, 3:02 PM GMT on October 15, 2011 +20
In the Western Caribbean, a large area of disturbed weather associated with a low pressure system is bringing heavy rains to Western and Central Cuba, the Cayman Islands, and Mexico's Yucatan Peninsula. Moisture from Tropical Depression 12-E, which moved inland near the Mexico/Guatemala border and dissipated on Wednesday, has invigorated this low. Rainfall amounts of 5 - 10 inches have fallen over Central Cuba since October 9, according to radar estimates from the Key West Radar.


Figure 1. Morning radar image from Key West, FL radar.

The low is too large to develop quickly, and is likely to move over the Yucatan Peninsula on Sunday, limiting the potential for development. NHC is giving the system just a 20% chance of developing into a tropical depression by Monday. Most of the models predict only weak development of the storm, since wind shear is currently a moderate to high 15 - 25 knots, and is expected to be in the moderate to high range over the next three days. The low is likely to move north and then northeast early next week, and cross the west coast of Florida on Tuesday or Wednesday. Rains from the storm are already affecting the Florida Keys, as seen on long-range Key West radar. Mexico's Yucatan Peninsula and Western Cuba will see the heaviest rains from the disturbance over the weekend, and extreme South Florida and the Florida Keys could see heavy rains of 3 - 5 inches through Monday.

Another area of disturbed weather over the far Eastern Atlantic, 700 miles southwest of the Cape Verde Islands, has developed a modest degree of spin, but has very limited heavy thunderstorm activity. NHC is giving this system a 20% chance of developing into a tropical depression by Monday.

Jeff Masters
Categories: Hurricane
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101. kmanislander 5:22 PM GMT on October 15, 2011    
Well the rain has eased off so I am going to make a run for it. Back later.
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102. stormpetrol 5:27 PM GMT on October 15, 2011    
I think the center of 95l is around 16N.82.5W, that is really the only area where I can see a distinct spin

Link
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103. KEEPEROFTHEGATE (Mod) 5:28 PM GMT on October 15, 2011    
.
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104. Saltydogbwi1 5:29 PM GMT on October 15, 2011    
img src="">

About 1/2 hour ago looking west from spotts beach south side grand cayman
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105. seflagamma 5:30 PM GMT on October 15, 2011    
Quoting kmanislander:
LOL

My forecast Thursday for the NW Caribbean to become an Invest was between midnight last night and noon today. 95L shows up 1 hour before the end of that period.



I've been lurking.. you did good! :o)



Member Since: August 29, 2005 Posts: 286 Comments: 40485
106. druseljic 5:30 PM GMT on October 15, 2011    
Quoting Saltydogbwi1:
img src="">

About 1/2 hour ago looking west from spotts beach south side grand cayman


Crazy weather but it makes a beautiful picture!
Member Since: August 13, 2007 Posts: 0 Comments: 649
107. TropicalAnalystwx13 5:38 PM GMT on October 15, 2011    
TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT SAT OCT 15 2011

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

A BROAD LOW PRESSURE SYSTEM CENTERED JUST EAST OF BELIZE CONTINUES
TO PRODUCE A LARGE AREA OF DISORGANIZED SHOWERS AND THUNDERSTORMS
ACROSS MUCH OF THE NORTHWESTERN CARIBBEAN SEA AND ADJACENT LAND
AREAS. ALTHOUGH SURFACE PRESSURES OVER THE NORTHWESTERN CARIBBEAN
SEA HAVE CHANGED LITTLE DURING THE PAST DAY OR SO...SOME
DEVELOPMENT OF THIS LOW IS POSSIBLE BEFORE THE CENTER MOVES OVER
THE YUCATAN PENINSULA ON SUNDAY. THIS SYSTEM HAS A LOW CHANCE...20
PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.
REGARDLESS OF DEVELOPMENT...THIS DISTURBANCE IS EXPECTED TO PRODUCE
LOCALLY HEAVY RAINS OVER THE YUCATAN PENINSULA...CUBA...JAMAICA...
AND THE CAYMAN ISLANDS DURING THE NEXT COUPLE OF DAYS. IN
ADDITION...STRONG GUSTY WINDS ARE LIKELY OVER THE SOUTHERN
GULF OF MEXICO DURING THE NEXT COUPLE OF DAYS.

SHOWERS AND THUNDERSTORMS ASSOCIATED WITH AN AREA OF LOW PRESSURE
LOCATED ABOUT 800 MILES WEST-SOUTHWEST OF THE CAPE VERDE ISLANDS
HAVE DECREASED SINCE THIS MORNING. DEVELOPMENT...IF ANY...OF THIS
SYSTEM IS EXPECTED TO BE SLOW TO OCCUR. THIS DISTURBANCE HAS A LOW
CHANCE...10 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS AS IT MOVES WESTWARD AT ABOUT 15 MPH.

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

$$
FORECASTER CANGIALOSI/BROWN
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108. seflagamma 5:39 PM GMT on October 15, 2011    
Hi everyone,

just checking in to see what is going on with our Caribbean blob... some of those outter clouds are slipping up to us here in SE Florida.


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109. Patrap 5:40 PM GMT on October 15, 2011    
Member Since: July 3, 2005 Posts: 372 Comments: 111605
110. KEEPEROFTHEGATE (Mod) 5:41 PM GMT on October 15, 2011    
XX/INV/95L
MARK
19.96N/84.63W
Member Since: July 15, 2006 Posts: 143 Comments: 40636
111. seflagamma 5:41 PM GMT on October 15, 2011    
Florida over all is in good shape with rainfall this year since our very dry/drought winter/spring ... the only part of the state still in trouble is the Panhandle.
as you can see from the drought map and the moisture maps.

and a few days ago all of South and Central Florida were blue and dark green on moisture maps.


These maps are measuring fire hazard and soil moisture, not necessary drought according to rainfall.


-------------------------

This is the real "drought map" for our area.




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112. Patrap 5:42 PM GMT on October 15, 2011    
I always wondered, Who is "Mark" ?



: )
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113. Patrap 5:44 PM GMT on October 15, 2011    
RAMMB AL952011 - INVEST


Enhanced Infrared (IR) Imagery (4 km Mercator)




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114. Levi32 5:53 PM GMT on October 15, 2011    
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115. Patrap 5:54 PM GMT on October 15, 2011    
Lake Erie's Toxic Algae Bloom Seen From Space: Green Scum Rampant In The Great Lakes (PHOTOS)



Toxic algae is sucking the oxygen out of Lake Erie.

The lake is currently undergoing one of the worst algae blooms in decades, turning the water a scummy bright green. According to NASA, blooms like this did occur in the 1950's and 60's, but now phosphorus from farms, sewage, and industry have fertilized the waters.

After the 60's, increased regulations and improvements in agriculture and sewage treatment limited the phosphorus and helped to control the blooms. However, the shallower Western basin near Detroit has been more susceptible to the algae than other deeper areas.

The exact reason behind the bloom is a bit unclear, but scientists believe it could be linked to increased rainfall and, believe it or not, mussels. It seems the types of mussel, zebra and quagga that have invaded the lake feed on phytoplankton instead of algae, making it even easier for the blooms to occur, according to NASA.

While the algae doesn't directly kill fish, it's still not good. As the algae dies, it's broken down by bacteria which uses oxygen from the water. This oxygen removal creates areas where fish can't survive. In addition, if consumed, it can also create flu-like symptoms in people or even kill pets.

Former Vice President Al Gore spoke Thursday in Detroit on the matter, associating climate change with the algae problem. "We're still acting as if it's perfectly OK to use this thin-shelled atmosphere as an open sewer. It's not OK," he said. "We need to listen to the scientists. We need to use the tried and true method of using the best evidence, debating and discussing it, but not pretending that facts are not facts."

While in the past, some have criticized Gore, claiming that he's made exaggerated statements about the environment, yesterday's speech drew upon some pretty hard scientific evidence, leading many leaders at the International Joint Commission to listen a bit more intently.

This past summer, an algae bloom spread across a beach in China, dying everything in its path "a shocking bright green."
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116. CitikatzSouthFL 5:57 PM GMT on October 15, 2011    
Quoting KEEPEROFTHEGATE:
XX/INV/95L
MARK
19.96N/84.63W


Well, that post does not confirm "slow to develop" to me! JMHO
Lots of clouds in S. Florida all, but no rain so far. We still need rain although not as dangerously dry as earlier in the summer. We are still behind on total rainfall amount, Lake Okeechobee is still to low for comfort, soooo bring us some more please 95L.
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117. CitikatzSouthFL 5:58 PM GMT on October 15, 2011    
Quoting Saltydogbwi1:
img src="">

About 1/2 hour ago looking west from spotts beach south side grand cayman

AWESOME photo!! Thanks for sharing.
Member Since: August 14, 2009 Posts: 0 Comments: 293
118. Levi32 6:00 PM GMT on October 15, 2011    
A tropical wave just west of Jamaica is coming into the sandbox to play with the broad low in the western Caribbean. This may enhance vorticity over the water just east of the main low which is hugging the Belize coastline according to radar. The Caymans are about to get the big shot of rain that Kingston just got.

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119. KEEPEROFTHEGATE (Mod) 6:00 PM GMT on October 15, 2011    
Quoting Patrap:
I always wondered, Who is "Mark" ?



: )

mark be the centre of the image

:)
Member Since: July 15, 2006 Posts: 143 Comments: 40636
120. KEEPEROFTHEGATE (Mod) 6:04 PM GMT on October 15, 2011    
212

WHXX01 KWBC 151514

CHGHUR

TROPICAL CYCLONE GUIDANCE MESSAGE

NWS NATIONAL HURRICANE CENTER MIAMI FL

1514 UTC SAT OCT 15 2011



DISCLAIMER...NUMERICAL MODELS ARE SUBJECT TO LARGE ERRORS.

PLEASE REFER TO NHC OFFICIAL FORECASTS FOR TROPICAL CYCLONE

AND SUBTROPICAL CYCLONE INFORMATION.



ATLANTIC OBJECTIVE AIDS FOR



DISTURBANCE INVEST (AL952011) 20111015 1200 UTC



...00 HRS... ...12 HRS... ...24 HRS. .. ...36 HRS...

111015 1200 111016 0000 111016 1200 111017 0000



LAT LON LAT LON LAT LON LAT LON

BAMS 17.4N 86.4W 18.5N 87.2W 18.9N 88.5W 19.1N 89.9W

BAMD 17.4N 86.4W 18.8N 87.2W 19.9N 88.3W 20.7N 89.9W

BAMM 17.4N 86.4W 18.7N 87.1W 19.4N 88.2W 19.9N 89.7W

LBAR 17.4N 86.4W 18.8N 87.2W 20.9N 88.0W 23.2N 88.5W

SHIP 25KTS 31KTS 38KTS 45KTS

DSHP 25KTS 31KTS 29KTS 27KTS



...48 HRS... ...72 HRS... ...96 HRS. .. ..120 HRS...

111017 1200 111018 1200 111019 1200 111020 1200



LAT LON LAT LON LAT LON LAT LON

BAMS 19.1N 91.1W 19.7N 92.3W 18.1N 93.1W 14.9N 95.5W

BAMD 21.0N 91.4W 21.4N 93.2W 21.5N 93.4W 20.4N 90.8W

BAMM 20.0N 91.1W 20.4N 93.1W 19.7N 94.8W 17.7N 97.4W

LBAR 25.3N 88.2W 30.3N 82.7W 38.5N 67.3W 41.7N 59.2W

SHIP 53KTS 63KTS 60KTS 49KTS

DSHP 33KTS 43KTS 40KTS 28KTS



...INITIAL CONDITIONS...

LATCUR = 17.4N LONCUR = 86.4W DIRCUR = 0DEG SPDCUR = 2KT

LATM12 = 17.0N LONM12 = 86.4W DIRM12 = 360DEG SPDM12 = 2KT

LATM24 = 16.6N LONM24 = 86.5W

WNDCUR = 25KT RMAXWD = 75NM WNDM12 = 25KT

CENPRS = 1006MB OUTPRS = 1008MB OUTRAD = 225NM SDEPTH = S

RD34NE = 0NM RD34SE = 0NM RD34SW = 0NM RD34NW = 0NM



$$

NNNN
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121. masonsnana 6:10 PM GMT on October 15, 2011    
Quoting Levi32:
Good morning.

Blog update:

Tropical Tidbit for Saturday, October 15th, with Video
Thanks Levi, great tibit as usual!
Member Since: February 14, 2004 Posts: 2 Comments: 513
122. Saltydogbwi1 6:15 PM GMT on October 15, 2011    
Quoting CitikatzSouthFL:

AWESOME photo!! Thanks for sharing.


Tks ;-) rains slowed to a drizzle for now but looks like a LOT more on the way over the next day or two
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123. CitikatzSouthFL 6:20 PM GMT on October 15, 2011    
Quoting Saltydogbwi1:


Tks ;-) rains slowed to a drizzle for now but looks like a LOT more on the way over the next day or two

South FL might get our share too. I sure wish I were in that tropical setting right now, tho, rain or no rain! I do so love to visit the islands of the Carrib! Beautiful water and beaches...not mention good beer and rum!
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124. pottery 6:25 PM GMT on October 15, 2011    
Quoting Saltydogbwi1:
img src="">

About 1/2 hour ago looking west from spotts beach south side grand cayman

Great image!
Thanks for showing that.
Member Since: October 24, 2005 Posts: 0 Comments: 20708
125. Neapolitan 6:34 PM GMT on October 15, 2011    
95L is moving slightly north of northwest:

AL, 95, 2011101518, , BEST, 0, 187N, 872W, 25, 1006, DB, 34, NEQ, 0, 0, 0, 0, 1008, 200, 75, 0, 0, L, 0, , 0, 0, INVEST, S,
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126. wunderkidcayman 6:36 PM GMT on October 15, 2011    
hey guys let not worry about where the COC is right now lets just say its a broad area of low pressure however I do have to say it just seems that the center of the broad area of low pressure is located near 15/16N 81/82W and very very slowly shifting N
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127. DDR 6:39 PM GMT on October 15, 2011    
oh boy,its pouring here in Trinidad,radar doesnt look pretty eitherLink
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129. pottery 6:43 PM GMT on October 15, 2011    
Quoting DDR:
oh boy,its pouring here in Trinidad,radar doesnt look pretty eitherLink

Heavy here since about noon.
An inch or so, so far.
Stopped now.
Ground is soaked from the showers this week.
First time in a LONG while.....
Member Since: October 24, 2005 Posts: 0 Comments: 20708
130. pottery 6:44 PM GMT on October 15, 2011    
Quoting wunderkidcayman:
hey guys let not worry about where the COC is right now lets just say its a broad area of low pressure however I do have to say it just seems that the center of the broad area of low pressure is located near 15/16N 81/82W and very very slowly shifting N

Coming your way?
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131. DDR 6:56 PM GMT on October 15, 2011    
Quoting pottery:

Heavy here since about noon.
An inch or so, so far.
Stopped now.
Ground is soaked from the showers this week.
First time in a LONG while.....

Nice,about an inch and still coming down.Ground soaked with heavy rain that cant be good...
Looks like a repeat of last years La nina rain and floods.
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132. BenBIogger 6:57 PM GMT on October 15, 2011    
Quoting pottery:

Coming your way?


Heavy rain and wind heading his way.
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133. sunlinepr 6:58 PM GMT on October 15, 2011    
Quoting ITCZmike:
NOLA NOLA NOLA NOLA. NOLA!!

Ratrap's 100% NOLA.

NOLA NOLA NOLA NOLA. NOLA!!

He a 1,000% NOLA.

">

LOL

Action:
Quote
| Ignore User


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2nd time that racist mistake or error is posted here....
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135. TropicalAnalystwx13 6:59 PM GMT on October 15, 2011    
Tropical Wave + Caribbean Disturbace + Strong MJO = HEAVY HEAVY Rain

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136. prcane4you 7:04 PM GMT on October 15, 2011    
Wow...people spending their time the entire day watching a low to develop.Boring.
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137. charlottefl 7:05 PM GMT on October 15, 2011    
Did the blog change to where the most recent page is now the first instead of the last? And the most recent posts are at the top now?
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139. Neapolitan 7:06 PM GMT on October 15, 2011    
Quoting charlottefl:
Did the blog change to where the most recent page is now the first instead of the last?

At the top of the "Reader Comments" section, there are links to reverse the sort order; you may have hit it by mistake.
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140. charlottefl 7:07 PM GMT on October 15, 2011    
Quoting Neapolitan:

At the top of the "Reader Comments" section, there are links to reverse the sort order; you may have hit it by mistake.


Thank you so very much. Oh my gosh I thought I was looking my mind. :)
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141. seflagamma 7:09 PM GMT on October 15, 2011    
Post 133 did that "quote thing again" and now everything is since is showing up in his quote.

how did this get fixed last time it happened???
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142. BenBIogger 7:09 PM GMT on October 15, 2011    
Quoting charlottefl:
Did the blog change to where the most recent page is now the first instead of the last?


You must of change the "Sort" option. Its right next to "filter"
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143. charlottefl 7:11 PM GMT on October 15, 2011    
Quoting BenBIogger:


You must of change the "Sort" option. Its right next to "filter"


Yeah it's been like that for a couple days couldn't figure out what happened. I'd get on the blog and the same post would be at the end of the page for hours. Was thinking it was really dead in here lol.
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144. BenBIogger 7:11 PM GMT on October 15, 2011    
Quoting seflagamma:
Post 133 did that "quote thing again" and now everything is since is showing up in his quote.

how did this get fixed last time it happened???



Its working fine.
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145. TropicalAnalystwx13 7:11 PM GMT on October 15, 2011    
Quoting seflagamma:
Post 133 did that "quote thing again" and now everything is since is showing up in his quote.

how did this get fixed last time it happened???

I don't see a problem with that post...Are you using Internet Explorer?
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146. ChillinInTheKeys 7:12 PM GMT on October 15, 2011    




Dang, they reset our rainfall totals. For some reason NWS Key West only resets every couple of weeks. I wish they would have waited for this storm to pass.

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147. BenBIogger 7:16 PM GMT on October 15, 2011    
146.


How are you holding up?
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149. ChillinInTheKeys 7:18 PM GMT on October 15, 2011    
147. All's good here. Light to moderate rain all day. 15 to 20MPH.

Looks like it'll be going downhill soon here. Lower Keys.
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150. DDR 7:20 PM GMT on October 15, 2011    
Pottery
about 1.6 inches and starting to rain again.round 2 has begun...flash floods in Tunapuna
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151. LargoFl 7:32 PM GMT on October 15, 2011    
Quoting ChillinInTheKeys:




Dang, they reset our rainfall totals. For some reason NWS Key West only resets every couple of weeks. I wish they would have waited for this storm to pass.

gee that looks like a strong line of storms, stay safe down there
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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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