Dr. Jeff Masters' WunderBlog

97L to spread heavy rains in Lesser Antilles; major flooding in North Carolina
Posted by: Dr. Jeff Masters, 2. lokakuuta 2010 klo 15:42 (GMT) +3
A large region of disturbed weather (Invest 97L), centered about 400 miles east of the northern Lesser Antilles Islands, is headed west-northwest at about 15 mph and will bring heavy rain showers and gusty winds to the northern Lesser Antilles Islands today and Sunday. These showers can be seen approaching the islands on Martinique radar this morning. Wind shear is a moderate 10 - 20 knots over 97L, and the waters beneath are very warm, 29°C, but recent satellite imagery shows that 97L's heavy thunderstorms are limited and not well organized. A pass from the Windsat satellite at 5:51am EDT showed a moderate wind shift associated with 97L, but nothing close to a closed circulation. Top winds were around 30 - 35 mph. The SHIPS model predicts that wind shear over 97L will rise to the high range, 20 - 30 knots, today through Monday, then decline. The ECMWF model is the only model currently showing significant development 97L in the next seven days. The model predicts 97L will be near Puerto Rico on Monday, the Dominican Republic on Tuesday, and Haiti on Wednesday, with the storm developing into a tropical depression on Wednesday just north of Haiti, then moving northwards through the Turks and Caicos Islands and out to sea on Thursday. NHC is giving 97L a 20% chance of developing into a tropical depression by Monday, and has not tasked the Hurricane Hunters to fly into the storm over the next two days. 97L will move at about 10 mph through the islands on Sunday through Wednesday, bringing the potential for an extended 3-day period of heavy rains for the islands in its path. Even if 97L does not develop into a tropical depression, its slow motion may result in life-threatening flash flooding and mudslides in Puerto Rico, the Dominican Republic, Haiti, and eastern Cuba as it moves past.


Figure 1. Morning satellite image of Invest 97L.

Major flooding in northeastern North Carolina
Major flooding continues in northeastern North Carolina, where the Cashie River in Windsor is 5.4 feet over flood stage. North Carolina has been deluged by more than twenty inches of rain in some regions over the past week, due to tropical moisture streaming northwards in advance of Tropical Storm Nicole. Wilmington, NC set records this week for the heaviest 3-day, 4-day, and 5-day rainfall events in city history, and the month of September ended up as the second rainiest month ever recorded in the city. A remarkable 22.54" of rain fell on Wilmington during the 5-day period Sunday through Thursday. The previous record was 19.06", set in September 1999 during Hurricane Floyd. Fortunately, eastern North Carolina was under moderate drought conditions prior to this week's rainfall onslaught, with just 0.18" of rain falling during the first 25 days of September. Representatives from Portlight.org are on their way to the hardest-hit areas of North Carolina to beginning identifying needs in the wake of the flooding. Portlight expects to perform the first deployment of their new relief trailer within the next few days and send a truck loaded with water, food and personal hygiene supplies. You can follow their progress via the live webcam on the Portlight truck.

Our new Weather Extreme blogger, Christopher C. Burt, has posted a comparison of the maximum rainfall totals in each state affected by Hurricane Floyd of 1999, and this weeks extreme rainfall event, which he dubs "Super-Rainstorm Nicole." The two storms were very similar in the amount of rain they dumped, and we are very fortunate that moderate drought conditions preceded the arrival of this week's storm, or else billions in damage would have resulted.


Figure 2. Rainfall for the 7-day period ending at 8am EDT this morning shows the remarkable accumulations that fell in association with the tropical moisture ahead of Tropical Storm Nicole. Image credit: NOAA.

Elsewhere in the tropics
Disturbed weather has diminished in the Central Caribbean, where the remnants of Tropical Storm Nicole are no longer kicking up significant thunderstorm activity. Several of the models are predicting the formation of a tropical depression in the Mid-Atlantic 6 - 8 days from now, in a location that would not be of any danger to land areas.

Next update
I'll have an update Sunday morning.

Jeff Masters
Flooding Bristol Vermont (31337)
Flooding Bristol Vermont
Too Wet To Harvest Today (duck29)
Heavy rain and high winds for 2 days caused flash flooding in many areas of New York State
Too Wet To Harvest Today
Categories: Flood Hurricane
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151. robert88 2. lokakuuta 2010 klo 20:14 (GMT)    
Quoting CybrTeddy:


Its only October 2nd. You have no idea whether or not October's a bust or not.


Talking about the first 2 weeks for sure will be a bust. Link
Member Since: 22.05.2010 Posts: 0 Comments: 877
152. TOMSEFLA 2. lokakuuta 2010 klo 20:15 (GMT)    
Quoting winter123:


Good catch! This is an analogy year I hadn't heard of. Seems the overall steering patterns were the same. i.e. No east coast landfalls but one close call, lots of mexico landfalls.


nice job its looks pretty close.
153. TropicalAnalystwx13 2. lokakuuta 2010 klo 20:17 (GMT)    
We'll likely see up to five more named storms before the end of the season (Whenever it decides to end).

I believe we'll see 3 named storms this month, and 1/2 between November and December.

The season isn't over, guys...
Member Since: 6.07.2010 Posts: 89 Comments: 25166
154. KEEPEROFTHEGATE (Mod) 2. lokakuuta 2010 klo 20:18 (GMT)    
looks like we will be in stealth mode for a while even the blog is slow may even get a lot slower coming up on five hrs and we are struggling to get to 200 posts still
Member Since: 15.07.2006 Posts: 143 Comments: 40385
155. robert88 2. lokakuuta 2010 klo 20:18 (GMT)    
(greater than 130 percent of climatology.) I don't think so. That ain't happening.
Member Since: 22.05.2010 Posts: 0 Comments: 877
156. TropicalAnalystwx13 2. lokakuuta 2010 klo 20:19 (GMT)    
Quoting weatherman123456:
97L Still a Threat for Flooding
my blog update


Imposter? :|

Weatherman12345's Wunderblog
Member Since: 6.07.2010 Posts: 89 Comments: 25166
158. Patrap 2. lokakuuta 2010 klo 20:26 (GMT)    
Storm Junkie has entered the flood zone as seen on the Portlight Webcam here

Portlight Disaster Relief


We are headed up to eastern North Carolina right now to begin identifying communities that are a good fit for the Portlight mission. Specific information and contacts have been hard to come by today, but being in the area today should make things much easier.

We are also prepared to assist in anyway we can while we are also carrying out an assessment. The Portlight Live Webcam is running for much of this trip and you can view it and participate here:Portlight WEBCAM


We are beginning to identify needs in Eastern North Carolina in the aftermath of the recent torrential rains there. Many rural, isolated and under served areas will need our help. We are connecting with local officials and pastors who will be instrumental in helping us deliver relief. Our expectation is to deploy our relief trailer and, additionally, a truck loaded with water, food and personal hygiene supplies within the next few days.

If you live in the area and know of specific needs, please post them here. Or WU mail us.

As usual, your support makes this work possible.

Thank you for continuing to make a difference in people's lives.
Member Since: 3.07.2005 Posts: 370 Comments: 111244
159. fldude99 2. lokakuuta 2010 klo 20:28 (GMT)    
So nice to see the fall weather set in...goodbye to the 2010 season
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160. asgolfr999 2. lokakuuta 2010 klo 20:29 (GMT)    
Quoting NRAamy:
Eenie, meenie, miney, mo
Hurricane season is over

Hurricane season is not over



Let me clear it up for you. Hurricane season falls between 2 specific dates. The second of those 2 dates is in your future not your past. Ergo, hurricane season is not over. Put your eenie meenie coin away now, you have your response.

:-)
Member Since: 18.08.2007 Posts: 0 Comments: 310
161. CybrTeddy 2. lokakuuta 2010 klo 20:30 (GMT)    
Quoting robert88:


Talking about the first 2 weeks for sure will be a bust. Link


I think they're right.
Member Since: 8.07.2005 Posts: 253 Comments: 20179
162. stillwaiting 2. lokakuuta 2010 klo 20:41 (GMT)    
Quoting CybrTeddy:


Its only October 2nd. You have no idea whether or not October's a bust or not.
..alot stated the begining if october as being quite active w/a forecast for another tc forming behind nicile which never hsppened,rather obvious that the first half will.not be as active as many experts forecast jist a week ago,including docmasters,no ones always right though this" busy beginning of oct w/a pattern favoring a tc landfalls in the se"...was a blown forecast biiiig time!!!!imo
Member Since: 5.10.2007 Posts: 20 Comments: 4970
163. Patrap 2. lokakuuta 2010 klo 20:46 (GMT)    
SJ is up re conning the area and has found a lotta folks under water..4-5 ft deep.

So there is a need for help in these area's and we have found some to focus on.,,already seems.

We will be posting some info in the portlight Blog when SJ gets done today, more likely tomorrow after SJ, Paul and I have a phone conference.

SJ will have some pics uploaded here later tonight maybe as well.

Member Since: 3.07.2005 Posts: 370 Comments: 111244
164. CaptnDan142 2. lokakuuta 2010 klo 20:47 (GMT)    
Quoting asgolfr999:


Let me clear it up for you. Hurricane season falls between 2 specific dates. The second of those 2 dates is in your future not your past. Ergo, hurricane season is not over. Put your eenie meenie coin away now, you have your response.

:-)


Guess now you know, Amy. ;-)

The Atlantic hurricane season is officially from 1 June to 30 November. There is nothing magical in these dates, and hurricanes have occurred outside of these six months...


Link

Bottom line:
Per the calendar it isn't over.
As for storms, well, truth is, nobody actually "knows". Either side could be right.
Member Since: 21.08.2007 Posts: 0 Comments: 856
165. Tazmanian 2. lokakuuta 2010 klo 20:52 (GMT)    
hurricane season may be overe for the E PAC looks like they may end up with olny 7 name storms
Member Since: 21.05.2006 Posts: 5088 Comments: 111319
166. KoritheMan 2. lokakuuta 2010 klo 20:54 (GMT)    
Quoting Tazmanian:
hurricane season may be overe for the E PAC looks like they may end up with olny 7 name storms


Agreed. I'm very surprised that this year has been more inactive than 1999.
Member Since: 7.03.2007 Posts: 408 Comments: 15418
167. plywoodstatenative 2. lokakuuta 2010 klo 21:00 (GMT)    
When was the last time that we had a very active season as we are having right now, and the E. Pacific season ended early with a small amount of storms? Anything I can correlate that to?
Member Since: 15.11.2005 Posts: 16 Comments: 4147
168. KoritheMan 2. lokakuuta 2010 klo 21:00 (GMT)    
Quoting plywoodstatenative:
When was the last time that we had a very active season as we are having right now, and the E. Pacific season ended early with a small amount of storms? Anything I can correlate that to?


1995 and 1999.
Member Since: 7.03.2007 Posts: 408 Comments: 15418
169. plywoodstatenative 2. lokakuuta 2010 klo 21:01 (GMT)    
in both of those years, what was the final setup in October for us. Is there any way to match up the wind shear and trough set ups with this year?
Member Since: 15.11.2005 Posts: 16 Comments: 4147
170. WeatherfanPR 2. lokakuuta 2010 klo 21:12 (GMT)    
cloudy but no rain at Villa Fontana, Carolina, PR
Member Since: 23.08.2006 Posts: 0 Comments: 1506
171. PanhandleChuck 2. lokakuuta 2010 klo 21:19 (GMT)    
Wow, I thought yesterday was ssssssssssssssslllllllllllllooooooooooooooooowwwwwwwwwwwwwwwwwwwww
Member Since: 13.05.2008 Posts: 0 Comments: 1183
173. CaptnDan142 2. lokakuuta 2010 klo 21:28 (GMT)    
Quoting PanhandleChuck:
Wow, I thought yesterday was ssssssssssssssslllllllllllllooooooooooooooooowwwwwwwwwwwwwwwwwwwww


LOL! I had my comments set to show 100 per page to keep up. Guess I can lower that back down. They should make "6" an option. ;-)
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174. KEEPEROFTHEGATE (Mod) 2. lokakuuta 2010 klo 21:28 (GMT)    
Quoting PanhandleChuck:
Wow, I thought yesterday was ssssssssssssssslllllllllllllooooooooooooooooowwwwwwwwwwwwwwwwwwwww
more like a winter blog with such low post numbers going on 6 hrs still not at 200
Member Since: 15.07.2006 Posts: 143 Comments: 40385
175. KoritheMan 2. lokakuuta 2010 klo 21:29 (GMT)    
Quoting plywoodstatenative:
in both of those years, what was the final setup in October for us. Is there any way to match up the wind shear and trough set ups with this year?


1995:

Define "set up". If you are asking what the mean steering pattern was, then it should be noted that more storms moved equatorial (westward) during this period, a sharp contrast from the predominant recurvatures observed throughout August and September.

While I don't have any data on that period (since I don't know how to access it if such data exists, though I'm relatively certain it does), I would wager that this more westward propagation of storms was primarily due to an anomalous westward extension of the Bermuda High throughout the month. It is difficult to say this definitively though, as most of the observed storms during this period (Opal, Pablo, Roxanne, and Sebastien) either formed farther westward from tropical waves so that they effectively avoided recurvature, or they formed in the central/eastern Atlantic as low-latitude Cape Verde storms, but overall, I do believe that the high was stronger during October.

Since they stayed weaker, they tended to follow the low-level flow, thereby avoiding recurvature.

One storm, Noel, formed in September but persisted throughout the first week of October. Noel recurved harmlessly out to sea, but appears to be an outlier among the other observed storms during the month.

1999:

More or less the same, though there is a much smaller sample size during this year than in 1995, because only three storms were observed in October 1999: Irene, Jose, and Katrina.

All three of these storms impacted land, the first being Irene, which pummeled south Florida. Then there was Jose, which, though ultimately recurved, did not do so until it lashed the northern Leeward Islands.

Lastly, Katrina impacted Central America as a weak tropical storm. Katrina is not considered to be reflective of the overall upper air pattern for October 1999 though, because she was spawned off the western extent of a fronal zone, and thereby had no chance of recurvature.

All in all though, it appears that October 1999 had stronger troughing than was observed in October 1995.

In summary, it appears that in both those years, arbitrarily listed because both featured strong La Nina events (just like this year), the month of October featured a more westward propagation of storms compared to earlier in the season, which is noteworthy.

As far as vertical shear goes, in both the aforementioned years, it averaged well below average, and we can probably expect the same this year as well.
Member Since: 7.03.2007 Posts: 408 Comments: 15418
177. PanhandleChuck 2. lokakuuta 2010 klo 21:31 (GMT)    
Quoting CaptnDan142:


LOL! I had my comments set to show 100 per page to keep up. Guess I can lower that back down. They should make "6" an option. ;-)
Quoting KEEPEROFTHEGATE:
more like a winter blog with such low post numbers going on 6 hrs still not at 200


I had mine at 200, I can walk away for hours on end and not fall behind. I imagine it'll pick up this evening.

Member Since: 13.05.2008 Posts: 0 Comments: 1183
178. jurakantaino 2. lokakuuta 2010 klo 21:31 (GMT)    
Against all odds both siblings are getting more spin as they approach the islands , the first one is already on top of the leewards.
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179. CaptnDan142 2. lokakuuta 2010 klo 21:33 (GMT)    
Quoting PanhandleChuck:


I had mine at 200, I can walk away for hours on end and not fall behind. I imagine it'll pick up this evening.



Maybe. Sure didn't last night. I'm sure some are loving it - just not the ones that pay the bills. lol
Member Since: 21.08.2007 Posts: 0 Comments: 856
180. jurakantaino 2. lokakuuta 2010 klo 21:33 (GMT)    
Quoting WeatherfanPR:
cloudy but no rain at Villa Fontana, Carolina, PR
On the contrary here in the North west of PR is raining hard and thunders everywhere, lucky you!!
Member Since: 31.07.2008 Posts: 0 Comments: 730
181. bappit 2. lokakuuta 2010 klo 21:38 (GMT)    
Quoting KEEPEROFTHEGATE:
more like a winter blog with such low post numbers going on 6 hrs still not at 200

A few of our prolific bloggers are absent. That's part of it.
Member Since: 18.05.2006 Posts: 3 Comments: 4357
182. KoritheMan 2. lokakuuta 2010 klo 21:42 (GMT)    
Quoting bappit:

A few of our prolific bloggers are absent. That's part of it.


I'm here. :P
Member Since: 7.03.2007 Posts: 408 Comments: 15418
183. bappit 2. lokakuuta 2010 klo 21:42 (GMT)    
Quoting Neapolitan:


The blog can definitely be childish at times. And those who use real science to forecast what might happen should never be open to ridicule, in my opinion. But those who pull baseless wishcasts out of thin air--that is, with absolutely nothing substantial to support what they write--do deserve to be laughed at. That's how a social organism works to keep the foolishness to a minimum.

Again, I'm not saying anyone's opinion should be squashed...but if someone wants to come on here and say, "My feeling is that three Cat 5's will make landfall in Tampa by October 15th", he or she needs to be willing to accept derision when those storms fail to materialize. By the same token, those proclaiming the season over here on October 2nd, while the Atlantic waters are still warm and deep and atmospheric conditons aren't unnecessarily hostile all over, deserves to be questioned as to his or her methodology...especially if that methodology is based on nothing more scientific than gazing into a Harry Potter crystal ball.

That's how science works, guys.

A bit stuffy in here. Open some windows, let in the crisp fall air coming down from up north.
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184. Bielle 2. lokakuuta 2010 klo 21:45 (GMT)    
Quoting cat5hurricane:
Thanks for update, Doc


Great avatar photo!
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185. NRAamy 2. lokakuuta 2010 klo 21:47 (GMT)    
Ok, fine.....

I'm going with 47 1/2 and 56 2/3 chances.....

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186. CaribBoy 2. lokakuuta 2010 klo 21:48 (GMT)    
18N 63W.. light rain right now
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187. traumaboyy 2. lokakuuta 2010 klo 21:48 (GMT)    
Watup Amy.....Kori....Dan....and weekend crew!!
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188. CaptnDan142 2. lokakuuta 2010 klo 21:49 (GMT)    
Quoting NRAamy:
Ok, fine.....

I'm going with 47 1/2 and 56 2/3 chances.....



Hippo math?

;-)
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189. CaptnDan142 2. lokakuuta 2010 klo 21:50 (GMT)    
Quoting traumaboyy:
Watup Amy.....Kori....Dan....and weekend crew!!


Hiya Hiya
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190. hydrus 2. lokakuuta 2010 klo 21:50 (GMT)    
Quoting KoritheMan:


I'm here. :P
I think I found something interesting...Look at this loop. There is a good spin between Puerto Rico and the Domenican Republic...Link If you zoom on it ya cant miss it.
Member Since: 27.09.2007 Posts: 1 Comments: 14246
191. oakland 2. lokakuuta 2010 klo 21:51 (GMT)    
Quoting CaptnDan142:


Hippo math?

;-)


It's Amy, what else could it be?
Member Since: 4.09.2005 Posts: 41 Comments: 7520
192. NRAamy 2. lokakuuta 2010 klo 21:52 (GMT)    
Hola trauma y Captn.....

We had a cool lightning storm at 6 AM....no rain.... I watched the flashes out over the ocean.... Can't remember the last time that happened....
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193. NRAamy 2. lokakuuta 2010 klo 21:53 (GMT)    
Hi Oakland!

:)
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194. JupiterFL 2. lokakuuta 2010 klo 21:53 (GMT)    
The blog is slow for this time of year and this is my opinion why:
Part of the problem is the all out assault certain bloggers have taken recently. Would anyone really fault Reed if he never showed up again? Some people make jokes and some are students, some are professional mets and some are smart enough to be if so desired. The main thing is that this is a community. We should all be more tolerant no matter what the other person adds to the blog. This blog has a huge population that is a sample of the real world. I certainly am not going to get along with everyone in here but I can skip their posts. Its ok if someone makes a joke about me. I can laugh at myself without "reporting" or "flagging".
CAN YOU?
Member Since: 10.08.2005 Posts: 0 Comments: 2146
195. Dakster 2. lokakuuta 2010 klo 21:55 (GMT)    
NRAamy - Can I borrow one our your forks... I need to stick it in 97L, 'cause it looks done...

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196. oakland 2. lokakuuta 2010 klo 21:55 (GMT)    
{{{Amy}}}
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197. InTheCone 2. lokakuuta 2010 klo 21:55 (GMT)    
Quoting bappit:

A few of our prolific bloggers are absent. That's part of it.


I'm here, lurking as usual. We have a bit of a fall lull underway, but we might get something to watch later in the week. Till then, all's quiet on the blog front! In some ways, I kind of like it, since the clean out awhile ago, a large part of the blog was at times simply moronic. Most all of the posts at the present time are a nice read, just aren't very many of them!
Member Since: 1.09.2007 Posts: 0 Comments: 1979
198. NRAamy 2. lokakuuta 2010 klo 21:56 (GMT)    
Sure, Dak....just make sure you give it back asap..... I get the feeling I'm not through with it....
Member Since: 24.01.2007 Posts: 315 Comments: 31937
199. CaptnDan142 2. lokakuuta 2010 klo 21:56 (GMT)    
Quoting NRAamy:
Hola trauma y Captn.....

We had a cool lightning storm at 6 AM....no rain.... I watched the flashes out over the ocean.... Can't remember the last time that happened....


Kitty didn't think it was all that cool tho, eh? lol
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200. hydrus 2. lokakuuta 2010 klo 21:57 (GMT)    
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201. Dakster 2. lokakuuta 2010 klo 22:00 (GMT)    
Will do... Thanks.

Ohh can you at least wipe it off first?

JupiterFL - Sometimes this place reminds me of Junior High... I do agree with you. I may not agree with everyone here, but I don't let it affect me personally. I also don't go "after" people for their viewpoint either. (A certain annoying blogger excluded)
Member Since: 10.03.2006 Posts: 0 Comments: 4922

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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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