97L gets disrupted by Hispaniola

By: Dr. Jeff Masters , 12:53 PM GMT on July 21, 2010

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A tropical wave (Invest 97L) near the north coast of Hispaniola has been disrupted by interaction with the island, plus the effects of moderate wind shear of 10 - 20 knots. The storm is no longer a threat to develop into a tropical depression today, and the Hurricane Hunter flight that was scheduled for today has been postponed until Thursday. The disturbance has brought heavy rains of 8+ inches to Culebra, Vieques, the Virgin Islands, and some of the northern Lesser Antilles Islands. Wunderblogger Weather456 reported that the power was knocked out on the island of St. Kitts for about 24 hours, due to the intense lightning associated with 97L. All of Puerto Rico and the Virgin Islands are under flash flood watches today.

Satellite images of 97L show a relatively meager number of heavy thunderstorms that are not well-organized. The curved bands to the north and east of the center have disappeared, and there is no evidence of low-level spiral banding or of a surface circulation. Surface observations over the northern Dominican Republic show only light winds, with no westerly winds indicating that a surface circulation is forming. Long-range radar loops from San Juan show a much reduced amount of thunderstorm activity.


Figure 1. Total radar-estimate rainfall for 97L.

Track Forecast for 97L
The storm is in a fairly straightforward steering current environment, and 97L should progress steadily to the west-northwest through Saturday. The rains from 97L's thunderstorms will bring the threat of isolated flooding to the Dominican Republic today, and to Haiti on today and Thursday. Heavy rains from 97L will affect eastern Cuba, the Turks and Caicos Islands, and the eastern Bahamas Thursday, and South and Central Florida can expect heavy rains to arrive Thursday night or Friday morning. The latest suite of model runs from 2am EDT this morning (6Z) foresee 97L making landfall on the Florida coast somewhere between Miami and Cape Canaveral on Friday, then continuing into the Gulf of Mexico on Saturday. Only the Canadian model foresees a threat to Texas, and the other models predict a second landfall between eastern Louisiana and the Florida Panhandle.

Intensity Forecast for 97L
The primary detriment to development of 97L today will be its close proximity to the landmass of Hispaniola. Once the storm pulls away from the island tonight, 97L has a better chance of development. Also hindering development over the next two days will be the presence of dry, stable air in its path over the Bahamas, thanks to the upper-level low to the north of the Dominican Republic. The SHIPS model predicts shear will stay in the moderate range, 10 - 20 knots, over the next three days, which should allow for some steady development of 97L on Thursday and Friday before it reaches Florida. NHC is giving 97L a 60% chance of developing into a tropical depression by Friday, which is a reasonable forecast. I think there is a 70% chance 97L will eventually become Tropical Storm Bonnie, sometime in the next five days. Sudden rapid development before 97L reaches Florida is unlikely, due to the storm's current state of disorganization and the dry air over the Bahamas. It's very unlikely that 97L has time to organize into a hurricane before hitting Florida. I put the odds of 97L making it to hurricane strength before reaching Florida at 5%, and I give a 20% chance it will be a hurricane in the Gulf of Mexico. The probability of 97L being a hurricane in the Gulf of Mexico will depend heavily upon how long the storm spends over water in the Gulf, which is very uncertain. The environment in the Gulf of Mexico should be favorable for intensification, if passage over Florida does not disrupt the storm too much.

I'll have a new post Thursday morning, or earlier if there's a major change to 97L.

Famed climate scientist Steven Schneider dies
Steven Schneider, one of the most influential and talented climate scientists of our time, died on Monday. Ricky Rood has a tribute to Dr. Schneider in today's blog. Ricky comments, "He is known for feistiness. His last book was Science as a Contact Sport: Inside the Battle to Save Earth's Climate. He was a man who was, bluntly, harassed and threatened by those who did not like his message. He never shrank from the battle."

Jeff Masters

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4262. 7544
morning all wow looks like 97l has formed nice overnight and u can see the conv buliding around the coc now pres dropping

and as the nhc says we could see td3 at anytime but i think it will a ts shortly after that . looks like that old cmc has this one right on and this could get stronger just before it reaches so fla
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Expect a renumber shortly.
Member Since: July 8, 2005 Posts: 259 Comments: 24016
Quoting bohonkweatherman:
98L will be a southern or central Mexico storm and should have little if any impact on Texas


But you folks living in Mexico, this will cause catastrophic floods there, as this system will generally be weak as it moves onshore, according to the NHC "in a day or two."
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Quoting futuremet:


It is also amazing how the blog makes a 180 degree shift in less than two hours lol.
Goodmorning all. Shift in 2 hours. The blog made a U turn in a matter of minutes after that 100% circle was drawn on the NHC's map.
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4257. scott39
Quoting Snowlover123:
lol



100% chance of formation, anyone?
Ive seen near 0% but first time of seen near 100%.
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From 40% to 100% in a matter of 6 hours.

Impressive.
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Quoting gulfbreeze:
It needs to stay east or north of the oil>

Please stay north and hits s fla and then the panhandle as a TS...
please stay away from the oil...
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Quoting Stormchaser2007:
Wow.

Good ole Avila.
That's always been my main man, lol.
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Quoting MiamiHurricanes09:
Lol I got an alert from the NHC saying that I'm under a TS warning. Lol I had to get on the blog through my phone to see the madness. We might of well have Bonnie at 11 AM.


You'll probably be under a TS warning shortly.
Member Since: July 8, 2005 Posts: 259 Comments: 24016
TWC had breaking news at 8:30 saying a TD or TS has formed, so at least their paying some attention lol
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Quoting Thundercloud01221991:


dont forget we may also have TS watches in TX today from 98L meaning that we will need to watch 2 places in the US later today.... where do you think weather channel will be if that were to happen
98L will be a southern or central Mexico storm and should have little if any impact on Texas
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lol



100% chance of formation, anyone?
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guys my bro form FIU just heard itl go strait to 50 mph thunk he right?
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Quoting Abacosurf:


All depends on the ULL and its progression west. Looks to outpacing 97 at the moment. Moderate rate of intensification is my guess. Let's pray she stays south of the oil.
It needs to stay east or north of the oil>
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Quoting CybrTeddy:
NHC says expect advisories at 11 am.. so much for no named storms in July.
Lol I got an alert from the NHC saying that I'm under a TS warning. Lol I had to get on the blog through my phone to see the madness. We might of well have Bonnie at 11 AM.
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1. VISIBLE SATELLITE IMAGES AND OBSERVATIONS FROM THE BAHAMAS INDICATE
THAT THE AREA OF LOW PRESSURE IN THE SOUTHEASTERN BAHAMAS HAS
BECOME BETTER ORGANIZED AND A CLOSED CIRCULATION HAS FORMED.
ADVISORIES ON A TROPICAL DEPRESSION OR A TROPICAL STORM WILL BE
INITIATED AT 11 AM EDT...1500 UTC TODAY. THIS ADVISORY WILL LIKELY
INCLUDE TROPICAL STORM WATCHES AND WARNINGS FOR PORTIONS OF THE
BAHAMAS AND SOUTHERN FLORIDA.

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Quoting futuremet:


It is also amazing how the blog makes a 180 degree shift in less than two hours lol.


Funny sometimes.

Bring the rain, PLEASE. Our chances looked much better yesterday morning :-(

Jupiter here.
Member Since: January 30, 2010 Posts: 0 Comments: 3259
Wow.

Good ole Avila.
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4240. JLPR2
Quoting CybrTeddy:
NHC says expect advisories at 11 am.. so much for no named storms in July.


I guess Stormtop's toiled just got clogged. XD
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Quoting Jeff9641:


Time to start over and get new tracks because that is wrong.


Just shift the entire ensemble 50-75 miles north.

Center to pass north of Key West IMO. And south of Largo. 50-60 MPH.
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4238. OneDrop
Quoting Abacosurf:


Nah...Pick um off the ground if they fall. Leave the ones up that stay. Put um in your smoothie and have a great day! LOL

Right on Abaco, the ones on the ground are the most delicious. You can also make a mango pineapple salsa to put on top of your grilled dolphin and make a mango margarita to wash it down.
BTW Abaco, nice pic, I'm jonesing for some good surf. Is that pic taken in Abaco on the reef break?
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4237. MahFL
Oh possible TS at 11 am.
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Quoting Abacosurf:
Nice blow up of convection near the center. Really coming together. Amazing what a few hours and a visible can do.....


It is also amazing how the blog makes a 180 degree shift in less than two hours lol.
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NHC says expect advisories at 11 am.. so much for no named storms in July.
Member Since: July 8, 2005 Posts: 259 Comments: 24016
Clearly seen and moving wnw

Quoting Wots:
Morning all

COC visible on Piedra Grande Cuban radar

Link
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4231. IKE
There it is!

Member Since: June 9, 2005 Posts: 23 Comments: 37858
The last few frames of the 98L visible loop show a nice feeder band developing on the south side of the CoC:

Member Since: November 8, 2009 Posts: 4 Comments: 13526
4229. JLPR2
Quoting stormwatcherCI:
SPECIAL OUTLOOK ISSUED TO UPDATE THE DISTURBANCE IN THE SOUTHEAST
BAHAMAS.

VISIBLE SATELLITE IMAGES AND OBSERVATIONS FROM THE BAHAMAS INDICATE
THAT THE AREA OF LOW PRESSURE IN THE SOUTHEASTERN BAHAMAS HAS
BECOME BETTER ORGANIZED AND A CLOSED CIRCULATION HAS FORMED.
ADVISORIES ON A TROPICAL DEPRESSION OR A TROPICAL STORM WILL BE
INITIATED AT 11 AM EDT...1500 UTC TODAY.
THIS ADVISORY WILL LIKELY
INCLUDE TROPICAL STORM WATCHES AND WARNINGS FOR PORTIONS OF THE
BAHAMAS AND SOUTHERN FLORIDA.


Well look at that! XD
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Quoting msgambler:
morning earthly, KoTG, tkeith


Morning
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!!!!!
VISIBLE SATELLITE IMAGES AND OBSERVATIONS FROM THE BAHAMAS INDICATE
THAT THE AREA OF LOW PRESSURE IN THE SOUTHEASTERN BAHAMAS HAS
BECOME BETTER ORGANIZED AND A CLOSED CIRCULATION HAS FORMED.
ADVISORIES ON A TROPICAL DEPRESSION OR A TROPICAL STORM WILL BE
INITIATED AT 11 AM EDT...1500 UTC TODAY. THIS ADVISORY WILL LIKELY
INCLUDE TROPICAL STORM WATCHES AND WARNINGS FOR PORTIONS OF THE
BAHAMAS AND SOUTHERN FLORIDA.


Member Since: July 8, 2005 Posts: 259 Comments: 24016
morning earthly, KoTG, tkeith
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Quoting Thundercloud01221991:


dont forget we may also have TS watches in TX today from 98L meaning that we will need to watch 2 places in the US later today.... where do you think weather channel will be if that were to happen
SPECIAL OUTLOOK ISSUED TO UPDATE THE DISTURBANCE IN THE SOUTHEAST
BAHAMAS.

VISIBLE SATELLITE IMAGES AND OBSERVATIONS FROM THE BAHAMAS INDICATE
THAT THE AREA OF LOW PRESSURE IN THE SOUTHEASTERN BAHAMAS HAS
BECOME BETTER ORGANIZED AND A CLOSED CIRCULATION HAS FORMED.
ADVISORIES ON A TROPICAL DEPRESSION OR A TROPICAL STORM WILL BE
INITIATED AT 11 AM EDT...1500 UTC TODAY.
THIS ADVISORY WILL LIKELY
INCLUDE TROPICAL STORM WATCHES AND WARNINGS FOR PORTIONS OF THE
BAHAMAS AND SOUTHERN FLORIDA.
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TWOAT
SPECIAL TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
825 AM EDT THU JUL 22 2010

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

SPECIAL OUTLOOK ISSUED TO UPDATE THE DISTURBANCE IN THE SOUTHEAST
BAHAMAS.

VISIBLE SATELLITE IMAGES AND OBSERVATIONS FROM THE BAHAMAS INDICATE
THAT THE AREA OF LOW PRESSURE IN THE SOUTHEASTERN BAHAMAS HAS
BECOME BETTER ORGANIZED AND A CLOSED CIRCULATION HAS FORMED.
ADVISORIES ON A TROPICAL DEPRESSION OR A TROPICAL STORM WILL BE
INITIATED AT 11 AM EDT...1500 UTC TODAY. THIS ADVISORY WILL LIKELY
INCLUDE TROPICAL STORM WATCHES AND WARNINGS FOR PORTIONS OF THE
BAHAMAS AND SOUTHERN FLORIDA.

AN AREA OF SHOWERS AND THUNDERSTORMS ASSOCIATED WITH A BROAD AREA OF
LOW PRESSURE IN THE BAY OF CAMPECHE CONTINUES TO SHOW SIGNS OF
ORGANIZATION. ENVIRONMENTAL CONDITIONS APPEAR TO BE CONDUCIVE FOR
SOME DEVELOPMENT OF THE LOW AS IT MOVES WESTWARD OR WEST-
NORTHWESTWARD AT 10 TO 15 MPH. THERE IS A MEDIUM CHANCE...50
PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE BEFORE IT
REACHES THE COAST OF MEXICO IN A DAY OR TWO.

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

$$
FORECASTER AVILA/ROBERTS
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How far will this system track North, if any?
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4220. JLPR2
Looks like 97L had a great night, its looking good! And an LLC appears to be just under the convection in the west side of the system, meaning shear is likely lowering, now this one has TD 3 written all over it.

98L looks good, I think it needs a little working on its LLC, ascat's last pass revealed there was none, once it a acquires one it could start exploding in those hot SSTs, lets just hope it doesn't acquire one so Mexico and Texas can have a break. :)

*Oh and morning everyone, I think I'm a little out of my time frame here. LOL*
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morning everyone..... StormW, Kog, Ike..

KOG or anyone Could you WU mail me on how to post a loop? every time I try I get a blank.
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HPC 36 hour forecast





HPC Preliminary Extended Forecast Discussion

Excerpt:

ALSO EARLY IN THE PERIOD THERE REMAINS A QUESTION OF TRACK/STRENGTH OF A TROPICAL FEATURE THAT IS EXPECTED TO TRACK INTO THE GULF OF MEXICO DURING THE SHORT RANGE. GUIDANCE CONSENSUS IS WELL SWWD OF YDAYS TPC/HPC COORDINATED TRACK... AND AN ADJUSTMENT IN THAT DIRECTION SEEMS REASONABLE GIVEN THE PERSISTENT STRONG RIDGE ALOFT OVER THE SERN CONUS. THE UPDATED PRELIM FCST MAKES A MEANINGFUL THOUGH NOT COMPLETE TREND TOWARD THE IDEAS OF LATEST MODEL SOLNS.
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Quoting scott39:
Does anybody have a fix on what conditions are going to be like in the GOM for 97Ls further developement?


All depends on the ULL and its progression west. Looks to outpacing 97 at the moment. Moderate rate of intensification is my guess. Let's pray she stays south of the oil.
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Looking at the visible imagery from this mornings first shots, 97L looks very close to a TD. Winds have always been high with this feature and thus a TS is not far away. Shear is relaxing as the upper low races towards florida, and convection has been persistant over the center.

I give 97L a 100% chance of becoming a TD/TS Bonnie today. (+ any storm with a track that could be damaging towards the US always has a generic bias to be named with the "just in case" aspect, so it's location alone is forcing upgrading)


98L is a more complex situation, it's a broad circulation with little space around it and landfall is going to happen in the next 24-72hours, so even if the system RI it won't have the time to consolidate into a hurricane.

However, because of the environmental conditions as well as land interaction providing friction around the symmetrical system, it's 80% sure to become a TD, and 50% to become a TS.


Both systems look very dangerous at the moment, in a way they are close to the "tipping point" of organisation and conditions do not look to be getting much worse in the next 24 hours, interesting times ahead!
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4214. MahFL
RED ALERT
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4213. tkeith
Quoting gulfbreeze:
This is not good for the oil in the Gulf will push it toward the coast!!!
If those models verify, (but they're likely to change) the northern Gulf coast will get an oil bath. Even if it's a moderate TS.
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IMO we go straight to TS no depression
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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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