Dr. Jeff Masters' WunderBlog

TD 7 dies; 93L little threat to develop
Posted by: Dr. Jeff Masters, 3:55 PM GMT on August 11, 2012 +32
Tropical Depression Seven is dead, ripped apart by moderate wind shear of 10 - 20 knots this Saturday morning. The storm was too small and fragile to survive the shear, thanks to dry air from the Sahara that had infiltrated the storm environment. None of the reliable models forecasts that TD 7 will regenerate as it tracks westwards across the Caribbean over the next four days. The remains of the storm should arrive in Mexico's Yucatan Peninsula on Wednesday.


Figure 1. Morning satellite image of the remnants of TD 7.

93L
A large tropical wave(Invest 93L) is located in the Eastern Atlantic about 300 miles northwest of the Cape Verde Islands. Satellite loops show a pronounced spin to the atmosphere at mid levels, but little in the way of heavy thunderstorm activity. The latest Saharan Air Layer Analysis from the University of Wisconsin shows that there is a large area of dry air from the Sahara surrounding 93L, which has infiltrated into the storm. This dry air will be a significant impediment to development during the coming week, as the 8 am EDT run of the SHIPS model predicts dryness at mid-levels of the atmosphere will increase during the next five days. None of the reliable computer models develop 93L during the coming seven days, and the storm is expected to move west-northwest and then north, recurving well to the east of Bermuda. In their 8 am Tropical Weather Outlook, NHC gave 93L a 20% chance of becoming a tropical depression by Monday morning.

I'll have a new post on Sunday.

Jeff Masters
Categories: Hurricane
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451. aislinnpaps 10:14 PM GMT on August 11, 2012    
Quoting leelee75k:
Has Pottery or any other Trinidadians been on lately? Heard that there was flooding and mudslides going on in Trinidad today


Pottery was on this morning.
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452. icmoore 10:15 PM GMT on August 11, 2012    
Quoting KEEPEROFTHEGATE:


have not seen him today
but there has been rains there
and maybe still

iam sure he will let us know when he can


I think Pottery may have been on this morning on Doc's old blog and talked briefly about the flooding Etc? but he was okay...
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453. TropicalAnalystwx13 10:15 PM GMT on August 11, 2012    
Quoting ncstorm:


the GFS dosent forecast local weather? funny, I see it in a lot of NWS discussions

I don't believe I ever said that. Tropical Weather and local weather are unrelated. Just because a model does poorly in one subject (local weather), doesn't mean it does in the other (tropical weather). The GFS is a very poor model for Severe Weather and local weather forecasting, but great with tropical weather.
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454. Hurricanes101 10:16 PM GMT on August 11, 2012    
Quoting TropicalAnalystwx13:

The GFS did not completely kill Ernesto, it showed it degenerating and then regenerating later in the Caribbean, which is exactly what it did. The night recon went in while the storm was located south of Jamaica, they did not find a closed circulation. Advisories were continued on the idea that regeneration would occur within 24 hours.


There were several runs of the GFS that did not regenerate Ernesto

it may have kept its vorticity somewhat, but it did not regenerate it to the point that Ernesto actally did until the storm was past Jamaica
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455. BahaHurican 10:16 PM GMT on August 11, 2012    




Keep forgetting it's already 7:15 in the ECar.... lol
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456. pottery 10:17 PM GMT on August 11, 2012    
Quoting leelee75k:
Has Pottery or any other Trinidadians been on lately? Heard that there was flooding and mudslides going on in Trinidad today

I'm here, but have been watching The Games.
Got GOLD in javelin and BRONZE in 4X100 relay today.
Team did real good. 45 th in medal standings out of 200 plus.

Very heavy rains in North Trinidad, major floods in Maraval, Diego Martin valleys.
Going to be $$$tens of millions of damages. Cars washed away, houses flooded out, bridges out, roads slipped away.

Bad stuff there.
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457. CaicosRetiredSailor 10:17 PM GMT on August 11, 2012    
Quoting leelee75k:
Has Pottery or any other Trinidadians been on lately? Heard that there was flooding and mudslides going on in Trinidad today



Some pictures showing up onFB



http://www.facebook.com/cepepcoltd
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458. BahaHurican 10:17 PM GMT on August 11, 2012    
This looks look a lot like it did in May over the Caymans...

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459. BahaHurican 10:18 PM GMT on August 11, 2012    
Quoting Tribucanes:
Area of increasing convection over central Cuba now moving NNE will be one to watch. Wouldn't be shocked to see an invest with this by this time tomorrow.
Reminds me of earlier this year, except hotter...

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460. ncstorm 10:19 PM GMT on August 11, 2012    
Quoting TropicalAnalystwx13:

I don't believe I ever said that. Tropical Weather and local weather are unrelated. Just because a model does poorly in one subject (local weather), doesn't mean it does in the other (tropical weather). The GFS is a very poor model for Severe Weather and local weather forecasting, but great with tropical weather.


TA I have to disagree with you there..look up any NWS, HPC and SPC discussions and they mention the GFS..its a WEATHER model, not just a tropical weather model..if it was terrible in local weather forecasting, then you wouldnt see it weighed on heavily by local weather agencies..with the upgrade it did receive, it has done better but is it spot on..nah..
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461. wunderkidcayman 10:19 PM GMT on August 11, 2012    
also to note new map came out for 925vort and it looks a bit more consolidated and stronger and from the same page the MSLP show one closed isobar that never showed up before

Quoting java162:


don't know how to post animation but there is clearly a spin coming into northern martinique!

don't know what to say but something is going on there

Quoting CosmicEvents:
I have to admire your perseverence, if nothing else. I'd caution you on tracking these zombies. They require a deep faith. There could come a time when there's not even a cloud in sight....that's when many zombie watchers give up. But, it's then, when there's nothing there but possibly some hidden energy...that's the time that separates the zombie watchers from those that wind up getting eaten unexpectedly by these things. Doesn't happen very often, but it has happened in the last few centuries.

I know but this one just has something

Quoting mcluvincane:
This year the GFS has been spot on... if the GFS dont show it, it aint gonna happen. Finally a model we can now count on and predict the very near weather future.

hmm I don't know about spot on spot on per say yeah I give it somethings for being correct for somethings but spot on nah I don't think so



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462. pottery 10:19 PM GMT on August 11, 2012    
Quoting BahaHurican:




Keep forgetting it's already 7:15 in the ECar.... lol


CONGRATULATIONS !!!!
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463. GeoffreyWPB 10:22 PM GMT on August 11, 2012    
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464. Tribucanes 10:22 PM GMT on August 11, 2012    
Hurricanes101, great if you have clarifying information, could you please deliver it in way that doesn't aim to put others under your boot? Debby wasn't an invest off the east coast of Florida for the record 101. There has been one invest there this season, and two other impressive blobs.
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465. wunderkidcayman 10:22 PM GMT on August 11, 2012    
Quoting BahaHurican:
This looks look a lot like it did in May over the Caymans...


right now it overcast and not a drop of rain and dead calm not really like may in may it was rainy
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466. DataNerd 10:23 PM GMT on August 11, 2012    
Afternoon all. Seven degenerated as expected, although it did so about 24 hrs sooner then I thought it would.

Current tropical wave/remains of seven Link

Last model runs we have for it show it heading to central America or Mexico:

Link



Latest runs on 93 show a re-curve, should any development occur: Link




So, for now we can expect things to quiet down. Will bear watching to see if Seven comes back but I doubt it would affect CONUS if it did. Very brief life span, and thats good.


I would expect things to remain quiet now until after the 28th. Also of note, a few days ago NHC upgraded the hurricane outlook to 17 named storms. There were also additional hurricanes and majors added as well. I will look for the documentation later.

Figure that is worth noting as that puts us into a largely above average season forecast and suggests there will be no appreciable El Nino.
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467. VAbeachhurricanes 10:24 PM GMT on August 11, 2012    
Quoting TropicalAnalystwx13:

I don't believe I ever said that. Tropical Weather and local weather are unrelated. Just because a model does poorly in one subject (local weather), doesn't mean it does in the other (tropical weather). The GFS is a very poor model for Severe Weather and local weather forecasting, but great with tropical weather.


I've also noticed the GFS has been getting pretty good with Nor'easters the last couple years.
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468. LargoFl 10:24 PM GMT on August 11, 2012    
Quoting ncstorm:
POSSIBLE TORNADO TOUCH DOWN. ATTACHED CAR PORT BLOWN OFF HOME AND TREE BLOWN DOWN. RESIDENT STATES THAT HE SAW A FUNNEL CLOUD LOWER AND TOUCH DOWN.
..thats it NC..keep abreast of whats going on around you today..some real nasty storms up there..stay safe
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469. BahaHurican 10:25 PM GMT on August 11, 2012    
Quoting Hurricanes101:


and in the short term a few days ago, the GFS said 93L would be a hurricane by now and its clearly not. The GFS also missed the boat by thinking for day that Ernesto would die out completely

the GFS also missed the development of TD 7, although the system was weak and didn't last long
IIRC, the GFS did in fact show a weak system crossing the CATL and dying out in the vicinity of the Antilles... as did one or two other systems...

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470. LargoFl 10:26 PM GMT on August 11, 2012    
FLOOD ADVISORY
NATIONAL WEATHER SERVICE MIAMI FL
523 PM EDT SAT AUG 11 2012

FLC086-112315-
/O.NEW.KMFL.FA.Y.0051.120811T2123Z-120811T2315Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000 Z.OO/
523 PM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED AN

* URBAN FLOOD ADVISORY FOR...
EAST CENTRAL MIAMI-DADE COUNTY IN SOUTHEAST FLORIDA...
THIS INCLUDES THE CITIES OF...SOUTH MIAMI...KENDALL...CORAL
GABLES...

* UNTIL 715 PM EDT

* AT 519 PM EDT NATIONAL WEATHER SERVICE MIAMI DOPPLER RADAR
INDICATED VERY HEAVY RAINFALL OCCURRING IN THE CORAL GABLES AREA. A
STORM SPOTTER NEAR THE INTERSECTION OR RED ROAD AND BIRD ROAD
REPORTED SIGNIFICANT STREET FLOODING. ANOTHER SPOTTER NEAR CORAL WAY
AND 62ND AVENUE REPORTED NEARLY FOUR INCHES OF STANDING WATER WITH
THE ROAD NEARLY IMPASSABLE.

ADDITIONAL STORMS WERE DEVELOPING TO THE SOUTHWEST OF THIS AREA AND
AN ADDITIONAL ONE TO TWO INCHES IS POSSIBLE DURING THE NEXT COUPLE
OF HOURS.

HEAVY RAINFALL WILL CAUSE PONDING OF WATER IN URBAN AREAS, HIGHWAYS,
STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE AREAS AND LOW
LYING SPOTS. RUNOFF WILL ALSO CAUSE ELEVATED WATERS LEVELS IN CANALS
AND DITCHES.

LAT...LON 2565 8031 2575 8038 2582 8022 2576 8019

$$

KOB
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471. ncstorm 10:27 PM GMT on August 11, 2012    
look at the 18z GFS..GOM-156 hours

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472. ncstorm 10:27 PM GMT on August 11, 2012    


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473. DataNerd 10:28 PM GMT on August 11, 2012    
GFS at 168 hours.




Shows one storm heading out to sea and two vigorous waves moving east in the ITCZ, likely to develop one or both of them later in the period.


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474. BahaHurican 10:28 PM GMT on August 11, 2012    
Quoting pottery:

I'm here, but have been watching The Games.
Got GOLD in javelin and BRONZE in 4X100 relay today.
Team did real good. 45 th in medal standings out of 200 plus.

Very heavy rains in North Trinidad, major floods in Maraval, Diego Martin valleys.
Going to be $$$tens of millions of damages. Cars washed away, houses flooded out, bridges out, roads slipped away.

Bad stuff there.
Excellent on the medals... That brings Caricom to 15+ now, right?

Sad to hear about the damage from flooding, though... looks like 07 was not a lucky # wx-wise...
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475. Tribucanes 10:29 PM GMT on August 11, 2012    
North Carolina has seen more than it's fair share of severe weather this year, huh ncstorm? Stay safe today. Grew up in Wilson, N.C and was in a twister there as a young boy. I see the touchdown was close to there today, glad there are no injury reports as of yet.
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476. DataNerd 10:29 PM GMT on August 11, 2012    
Quoting ncstorm:
look at the 18z GFS..GOM-156 hours




Is that mean ensemble or just one ensemble member?
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477. LargoFl 10:29 PM GMT on August 11, 2012    
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
558 PM EDT SAT AUG 11 2012

NCZ021-112230-
FORSYTH-
558 PM EDT SAT AUG 11 2012

...A STRONG THUNDERSTORM WILL MOVE ACROSS FORSYTH COUNTY THROUGH 630
PM EDT...

AT 558 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
WALKERTOWN...OR ABOUT 7 MILES NORTHEAST OF WINSTON-SALEM...MOVING
NORTHEAST AT 20 MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...BELEWS CREEK.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.

SEEK SHELTER IN A NEARBY BUILDING OR VEHICLE. STRONG WINDS ARE
CAPABLE OF KNOCKING DOWN SMALL TREES AND BLOWING AROUND TRASH CANS...
POTTED PLANTS...LAWN FURNITURE AND OTHER LIGHT OUTDOOR OBJECTS.

&&

LAT...LON 3627 8028 3627 8023 3626 8023 3626 8004
3620 8003 3613 8004 3606 8026 3622 8037
TIME...MOT...LOC 2158Z 229DEG 18KT 3620 8019

$$

23
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478. ncstorm 10:30 PM GMT on August 11, 2012    
Quoting Tribucanes:
North Carolina has seen more than it's fare share of severe weather this year, huh ncstorm? Stay safe today. Grew up in Wilson, N.C and was in a twister there as a young boy. I see the touchdown was close to there today, glad there are no injury reports as of yet.


I was in a twister myself when I was a child..the scariest thing I have ever experience..that is one weather event I do not want to experience again.
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479. ncstorm 10:30 PM GMT on August 11, 2012    
Quoting DataNerd:



Is that mean ensemble or just one ensemble member?


thats the operational..its running now
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480. KEEPEROFTHEGATE (Mod) 10:31 PM GMT on August 11, 2012    
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481. ncstorm 10:31 PM GMT on August 11, 2012    
174 hour
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482. GTcooliebai 10:31 PM GMT on August 11, 2012    
Quoting ncstorm:
look at the 18z GFS..GOM-156 hours

Oh well that's new.
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483. ProgressivePulse 10:31 PM GMT on August 11, 2012    
Interesting the reversal of organization in the Atlantic as the MJO is well established in the basin ATM.

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484. TropicalAnalystwx13 10:32 PM GMT on August 11, 2012    
Quoting GTcooliebai:
Oh well that's new.

And demonstrates that regeneration is possible if this gets in the Gulf. The CMC was the first to show this solution a few days ago.
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485. DataNerd 10:32 PM GMT on August 11, 2012    
Quoting ncstorm:


thats the operational..its running now



Check your wundermail please I sent you a request for a URL to where that comes from.


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486. ncstorm 10:32 PM GMT on August 11, 2012    
180 hours and still sitting there spinning off the LA coast

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487. ncstorm 10:33 PM GMT on August 11, 2012    
Quoting DataNerd:



Check your wundermail please I sent you a request for a URL to where that comes from.




Link
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488. pottery 10:33 PM GMT on August 11, 2012    
Quoting BahaHurican:
Excellent on the medals... That brings Caricom to 15+ now, right?

Sad to hear about the damage from flooding, though... looks like 07 was not a lucky # wx-wise...

Good going in the 4x4. Exceptional!
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489. leelee75k 10:34 PM GMT on August 11, 2012    
Thanks Pottery and others for the Trini updates, have family there and family enroute there right now and was worried if the bad weather would affect travel today.

Pictures look really bad, hope everyone there is safe and it's only material damage.
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490. ncstorm 10:35 PM GMT on August 11, 2012    
Wunderkid..man you about to be king if that run pans out..
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491. GTcooliebai 10:35 PM GMT on August 11, 2012    
18z GFS 192 hrs. system approaching the Mississippi Gulf Coast and a Cape Verde system:

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492. ncstorm 10:35 PM GMT on August 11, 2012    
192 hours
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493. LargoFl 10:35 PM GMT on August 11, 2012    
BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BLACKSBURG VA 634 PM EDT SAT AUG 11 2012 THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN ROCKINGHAM COUNTY IN NORTH CENTRAL NORTH CAROLINA SOUTHEASTERN STOKES COUNTY IN NORTH CENTRAL NORTH CAROLINA * UNTIL 715 PM EDT. * AT 630 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WALNUT COVE...AND MOVING NORTHEAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... PINE HALL... ELLISBORO... MADISON... INTELLIGENCE... STONEVILLE... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF QUARTER OR LARGER SIZED HAIL...AS WELL AS WIND DAMAGE...INCLUDING TREES OR LARGE LIMBS DOWNED BY CALLING THE NATIONAL WEATHER SERVICE TOLL FREE AT... 1...8 6 6...2 1 5...4 3 2 4. -------------------------------------------------- ------------------------------ LAT...LON 3652 7996 3626 7964 3627 8012 3632 8016 TIME...MOT...LOC 2234Z 233DEG 21KT 3632 8009 -------------------------------------------------- ------------------------------ RAB
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494. DataNerd 10:36 PM GMT on August 11, 2012    
Quoting ncstorm:


Link



Thanks, bookmarked for future use.
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495. BahaHurican 10:36 PM GMT on August 11, 2012    
Quoting wunderkidcayman:
also to note new map came out for 925vort and it looks a bit more consolidated and stronger and from the same page the MSLP show one closed isobar that never showed up before


don't know what to say but something is going on there


I know but this one just has something


hmm I don't know about spot on spot on per say yeah I give it somethings for being correct for somethings but spot on nah I don't think so



I wish people would be able to separate in their minds between better than before and perfect. The CMC and GFS have both benefitted from their recent tuneups, but neither is now a perfect forecasting tool. Consensus evaluation is still the approach used by the NHC, and IMO it's still the one that works best. I'm not stupid enough to dismiss the GFS solutions altogether, especially given its recent improvements. OTOH, I'm also not stupid enough to take it for gospel. I certainly will be looking at real-time conditions and other models, even the statisticals and climo, to make up my mind about what I think will happen.

Using TD07, I'm noticing that despite the`impact of shear as it approaches the Windwards, it still seems to have maintained a fairly healthy circulation - not I agree, enough for it to remain a TD, but not dead-in-the-water, either... This means I'm taking GFS et al with a grain of salt until I see how it fares with its passage through the ECar. It may be done; it may not. I'm not going to "bow down and worship" the GFS to the point where I take my eye off it altogether. That's the way to get a nasty surprise.

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496. GTcooliebai 10:37 PM GMT on August 11, 2012    
Roll that carpet out, GOM might be opened for business a series of shortwaves coming down to erode that Subtropical Ridge.
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497. DataNerd 10:37 PM GMT on August 11, 2012    
Quoting ncstorm:
192 hours



Note the long track cape verde storm forming.

0z and 12z were hinting at that as well and so does ngps and cmc.



GOM storm looks interesting, will have to see what happens next week. I think that scenario bears some merit.
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498. LargoFl 10:37 PM GMT on August 11, 2012    
PECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
631 PM EDT SAT AUG 11 2012

MDZ010-013-014-112300-
PRINCE GEORGES MD-ANNE ARUNDEL MD-HOWARD MD-
631 PM EDT SAT AUG 11 2012

...STRONG THUNDERSTORM TO AFFECT PRINCE GEORGES...ANNE ARUNDEL AND
HOWARD COUNTIES...

AT 632 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES NORTHEAST
OF GLENN DALE...MOVING NORTHEAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE CROFTON...ODENTON...FORT MEADE...
MILLERSVILLE AND SEVERN.

HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.

&&

LAT...LON 3924 7678 3915 7653 3887 7672 3894 7689
TIME...MOT...LOC 2232Z 206DEG 9KT 3901 7676

$$


BJL
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499. BahaHurican 10:37 PM GMT on August 11, 2012    
Quoting pottery:


CONGRATULATIONS !!!!
Thanks, and back atcha! [Haven't seen much of today's proceedings as yet...]
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500. wunderkidcayman 10:38 PM GMT on August 11, 2012    
Quoting ncstorm:
Wunderkid..man you about to be king if that run pans out..

ok

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501. ncstorm 10:38 PM GMT on August 11, 2012    


moves out on the east coast..264 hours
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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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