GOM: INVEST 90L

attallaman · #501 Postby **attallaman** » Sat May 23, 2009 9:08 am

Dean4Storms wrote:BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
844 AM CDT SAT MAY 23 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 915 AM CDT

* AT 844 AM CDT...THE PUBLIC REPORTED A LINE OF VERY STRONG WINDS
ASSOCIATED WITH A BAND OF SHOWERS AND ISOLATED THUNDERSTORMS
IN EXCESS OF 60 MPH. THE LEADING EDGE OF THESE WINDS WERE LOCATED
ALONG A LINE EXTENDING FROM BAYOU LA BATRE TO SAINT ELMO TO
IRVINGTON...AND MOVING NORTHWEST AT 15 MPH.

* THE DAMAGING WINDS WILL BE NEAR...
I10 AND MCDONALD ROAD BY 845 AM CDT...
GRAND BAY BY 905 AM CDT...
DEES BY 915 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS ESTIMATED UP TO 60 MPH WERE REPORTED AT ALABAMA PORT
WITH A MACROBURST...AND TORE BARK OF TREES AND THREW AROUND OTHER
UNSECURED ITEMS. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND
STAY AWAY FROM WINDOWS!

Nothing like that going on over here in Biloxi, all's quiet. Looks like my relatives in Lucedale will get more out of this system than I will if it continues on it's present path.

#502 Postby **HURAKAN** » Sat May 23, 2009 9:09 am

Inland now.

#503 Postby **tolakram** » Sat May 23, 2009 9:14 am

Looking at all the observation stations on shore it appears the center, or a center, moved ashore just west of Mobile Bay, near an area named Portersville Bay on the map. Max sustained winds were between 30 and 35MPH, which would be around 30 knots.

You can see on this map that the center was not well defined, so while the winds may have qualified it for a TD the circulation did not. In my opinion.

http://www.wunderground.com/wundermap/? ... fd=0&pix=0

#504 Postby **HURAKAN** » Sat May 23, 2009 9:18 am

It was a good test run for May to get us out of hibernation. 90L needed one more day or so but it ran out of water!

attallaman · #505 Postby **attallaman** » Sat May 23, 2009 9:21 am

Thanks for the info.

#506 Postby **wxman57** » Sat May 23, 2009 9:28 am

Bones says he can officially call it, now:

NEXRAD · #507 Postby **NEXRAD** » Sat May 23, 2009 9:29 am

Dean4Storms wrote:I believe this was a TC.

I initially thought the same when I noted the Fort Morgan, AL, station reporting sustained winds above 34-knots from 7:48 until 8:00 AM along with the Daupin Island pressure report down to 1003-1004 mb. While the system did present a reasonable satellite appearance, clear surface rotation, and a tight vortex on radar, I still wonder whether about it being a tropical storm/tropical cyclone. Technically the winds and pressure do meet tropical storm strength. That said, does a less than 30-minute swath of tropical storm force winds with a circulating system qualify for "tropical storm" (or even "tropical depression")? Would such short-lived systems with more isolated impacts be better classified as severe local storms (as NWS Mobile is obviously treating it this morning)?

I don't have a good answer, but as we're able to observe the oceans with finer detail and spot strangely tiny storm systems (like last year's Marco), I think the professionals are going to need to fine-tune TC definitions. A duration criteria could work, if such isn't already formally in place.

- Jay

#508 Postby **cycloneye** » Sat May 23, 2009 9:32 am

Maybe they will go back and look at it after the season is over to see if it merits any upgrade at Best Track.

#509 Postby **CrazyC83** » Sat May 23, 2009 9:36 am

This does have some suspicion for sure. Surface data would warrant a 35 kt tropical storm if it is upgraded.

That may have been the unnamed tropical storm...

#510 Postby **CrazyC83** » Sat May 23, 2009 9:43 am

If it were to be upgraded, I would start the BT at 1800Z yesterday, just as it started to develop solid convection.

This is entirely unofficial, but a possible BT (note I only use depression/storm since it is still to be determined if it was a TC):

22/1800 - 27.0 / 87.6 - 25 kt - 1006mb - Depression

23/0000 - 27.7 / 87.8 - 30 kt - 1005mb

23/0600 - 28.6 / 88.4 - 30 kt - 1004mb

23/1200 - 29.8 / 88.4 - 35 kt - 1002mb - Storm

23/1400 - 30.4 / 88.5 - 35 kt - 1001mb - Landfall east of Pascagoula, MS and minimum pressure

23/1800 - 31.1 / 88.6 - 30 kt - 1001mb - Depression

#511 Postby **HURAKAN** » Sat May 23, 2009 10:19 am

Ed Mahmoud · #512 Postby **Ed Mahmoud** » Sat May 23, 2009 10:37 am

Soon to be ex-90L, which I think was at least an STD, has yet to provide any rain for my lawn way over here in SE Texas. Odd that the dewpoint has been rising on a Northeast wind.

Odd clouds yesterday. The cumulus had some vertical development, but most stopped growing at a high based stratus deck, which had only patchy holes revealing blue sky, a few punched past and produced showers.

But multilayered clouds, high humidity and a Northeast wind, it almost felt like something was brewing in the Gulf and headed closer than the MS/AL state line.

#513 Postby **HURAKAN** » Sat May 23, 2009 11:00 am

cpdaman · #514 Postby **cpdaman** » Sat May 23, 2009 11:06 am

i guess you could say the rain this morning in Palm beach county, FL was associated with 90L

currently under a flood warning....with areas of 6-8 inch rainfalls in part of Boca Raton just in the last FEW hours.

(3) inches at my house brings the total to 9-10 inches since monday...

OpieStorm · #515 Postby **OpieStorm** » Sat May 23, 2009 11:07 am

It was pretty rough here (pensacola) early this morning with very heavy rain and gusty wind but it's calmed down now.

Chacor · #516 Postby **Chacor** » Sat May 23, 2009 11:13 am

The poor weather caused in part by 90L has forced the postponement of SS Atlantis' return to Earth.

http://news.bbc.co.uk/2/hi/science/nature/8062773.stm

Cyclone1 · #517 Postby **Cyclone1** » Sat May 23, 2009 11:14 am

Wow, that really looks like it kicked up there at the end. Definitely looks suspect.

Either way, it's immediate future is grim.

jinftl · #518 Postby **jinftl** » Sat May 23, 2009 11:15 am

This morning's rain due more to convergence line and short wave moving up from the keys than 90L for se fl...

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MIAMI FL
1038 AM EDT SAT MAY 23 2009

.UPDATE...
THIS MORNING THERE HAS BEEN A CONVERGENCE LINE OF SHOWERS AND
THUNDERSTORMS OVER THE METRO AREAS OF PALM BEACH COUNTY, AND
WESTERN METRO AREAS OF BROWARD COUNTY...DUE TO THE DRAINAGE FLOW
FROM THE LAND AND THE EASTERLY WIND FLOW FROM THE ATLANTIC WATERS.
AT THE SAME TIME...A SHORT WAVE IN THE MIDDLE OF THE ATMOSPHERE HAS
ALSO BEEN WORKING NORTH FROM THE FLORIDA KEYS INTO SOUTH FLORIDA.

THE SHORT WAVE WILL CONTINUE TO MOVE NORTH THROUGH THE CWA THIS
AFTERNOON...AS THE CONVERGENCE LINE SHOULD PUSH INLAND INTO THE
INTERIOR AREAS OF SOUTH FLORIDA. THIS WILL REFOCUS THE ACTIVITY
FROM THE EAST COAST METRO AREAS INTO THE INTERIOR AREAS ESPECIALLY
OVER THE LAKE OKEECHOBEE AREA.

THEREFORE...HAVE INCREASE THE POPS TO LIKELY THIS MORNING FOR
METRO PALM BEACH INTO BROWARD COUNTIES...BEFORE DECREASING THEM
BACK TO CHANCE THIS AFTERNOON. THE INTERIOR AREAS WILL REMAIN IN
THE LIKELY CAT TODAY...WITH THE WEST COAST METRO AREAS IN THE
CHANCE CAT.

cpdaman wrote:i guess you could say the rain this morning in Palm beach county, FL was associated with 90L

currently under a flood warning....with areas of 6-8 inch rainfalls in part of Boca Raton just in the last FEW hours.

(3) inches at my house brings the total to 9-10 inches since monday...

#519 Postby **xironman** » Sat May 23, 2009 11:15 am

I guess the sensor at Hollingers Is. is broken

Code: Select all

AP513 (APRSWXNET) WB4QEV-4 Hollingers Is. AL US
time    slp         t / td          dir / spd / gst/pcp   presWx & skyCover & Visibility
(UTC)  (mb)          (F)                    (mph)  (in.)                          (mi)
1457 ------(Z) 73.0(V)/-----(Z) 107°(Q)/073(Q)/---/0.00" 
1354 ------(Z) 71.0(V)/-----(Z)  49°(Q)/028(Q)/---/0.00"

attallaman · #520 Postby **attallaman** » Sat May 23, 2009 12:16 pm

Windier here now although no precip. NNW @ 13, gusting to 24.

GOM: INVEST 90L

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