TD 7 dies; 93L little threat to develop
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
Reader Comments
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Pottery was on this morning.
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...
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.
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
Keep forgetting it's already 7:15 in the ECar.... lol
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.
Some pictures showing up onFB
http://www.facebook.com/cepepcoltd
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..
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
CONGRATULATIONS !!!!
right now it overcast and not a drop of rain and dead calm not really like may in may it was rainy
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.
I've also noticed the GFS has been getting pretty good with Nor'easters the last couple years.
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
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.
Sad to hear about the damage from flooding, though... looks like 07 was not a lucky # wx-wise...
Is that mean ensemble or just one ensemble member?
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
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.
thats the operational..its running now
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.
Check your wundermail please I sent you a request for a URL to where that comes from.
Link
Good going in the 4x4. Exceptional!
Pictures look really bad, hope everyone there is safe and it's only material damage.
Thanks, bookmarked for future use.
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.
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.
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
ok
moves out on the east coast..264 hours
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