GOM: INVEST 90L

[HURAKAN]

[HURAKAN]

[HURAKAN]

90L comes close to being the season's first named storm

Posted by: JeffMasters, 5:30 PM GMT on May 23, 2009
The large extratropical storm (90L) that has been pounding Florida, the Bahamas, and Haiti this week with heavy rain and high surf has moved ashore over Mississippi. Last night and this morning, the storm put on an impressive burst of heavy thunderstorm activity and came close to becoming a subtropical or tropical depression. Winds at the Fort Morgan, AL station were 44 mph, gusting to 52 mph, and winds at Dauphin Island, Alabama coastal station were sustained at 39 mph, gusting to 48 mph at between 8am and 10am EDT this morning. While these winds were in excess of the 39 mph threshold of tropical storm force, both measurements were taken at elevations higher than the international wind measurement standard of ten meters, so the top measured winds of 90L were actually slightly less than tropical storm force. Had 90L spent another six hours over water, it very likely would have been declared a tropical/subtropical depression/storm.

The circulation around 90L continues to mean rain for Florida, but the rains will be lessening today. Rainfall amounts as high as 28 inches were measured this week in Northern Florida at Brunnell. Rainfall amounts of 2 - 3 inches have accumulated along the Alabama, Mississippi, and Florida Panhandle coasts from 90L so far (Figure 1).

[CrazyC83]

What were the elevation of the Fort Morgan and Dauphin Island stations?

[cycloneye]

Last Special Tropical Weather Outlook

000
ABNT20 KNHC 231732
TWOAT
SPECIAL TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
130 PM EDT SAT MAY 23 2009

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

SATELLITE IMAGERY...RADAR DATA...AND SURFACE OBSERVATIONS INDICATE
THAT THE AREA OF LOW PRESSURE THAT WAS OVER THE NORTH-CENTRAL GULF
OF MEXICO THIS MORNING HAS MOVED INLAND NEAR THE ALABAMA-MISSISSIPPI
BORDER. ALTHOUGH TROPICAL CYCLONE DEVELOPMENT IS NOT EXPECTED...
THIS SYSTEM IS LIKELY TO PRODUCE LOCALLY HEAVY RAINS OVER PORTIONS
OF THE SOUTHEASTERN UNITED STATES DURING THE NEXT DAY OR TWO. SEE
STATEMENTS FROM LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICES FOR
ADDITIONAL INFORMATION. THIS WILL BE THE LAST SPECIAL TROPICAL
WEATHER OUTLOOK ON THIS SYSTEM.

$$
FORECASTER PASCH/KIMBERLAIN

http://www.storm2k.org/weather/hw3.php? ... hwvmetric=

[CrazyC83]

Lowest pressure seems to be 1001mb at Big Point, MS. Also the Escatawpa Bluffs station is obviously broken (tornado?), since they recorded 111 mph winds.

[HURAKAN]

What were the elevation of the Fort Morgan and Dauphin Island stations?

33 m and 13.5 m, respectively.

[Bailey1777]

-Ok yesterday when all the models came out I jokingly did my own saying it would come ashore at 30.2 - 87.8. How close was I to where it officially came ashore?

[HURAKAN]

23/1745 UTC 30.6N 88.8W OVERLAND 90L -- Atlantic

[CrazyC83]

-Ok yesterday when all the models came out I jokingly did my own saying it would come ashore at 30.2 - 87.8. How close was I to where it officially came ashore?

It looked to be around 30.4/88.5.

[HURAKAN]

[cycloneye]

It raced just before reaching land.A more slower movement would be a clasification to TD or minimal TS.

[Category 5]

The bell has tolled for 90L. R.I.P.

[Brent]

Close but no cigar. Nice practice run before the season officially starts.

[HURAKAN]

[MGC]

I think 90L was a TD last night based on the surface observations and satellite presentation. We shall see what the NHC does in the post season......MGC

[Hurricanehink]

If it didn't have gale force winds, then don't expect anything any post-season upgrade. Tropical depressions aren't included in HURDAT, so there wouldn't be any reason to classify it. At least, I can't think of any tropical depressions that were upgraded in post-analysis.

[wxman57]

Squalls with 30-40 mph winds alone doesn't make it a TD/TS. There is a requirement for at least some degree of organization. That area of squalls was well removed from a rather broad center. Just too disorganized to classify.

[Cryomaniac]

I think 90L was a TD last night based on the surface observations and satellite presentation. We shall see what the NHC does in the post season......MGC

To be honest I doubt they'd upgrade a marginal TD postseason. Even if it was technically a TD, which seems unlikely.

[fci]

Well, I would like to officially thank 90L for the 8-12 inches of rain we received here in Palm Beach County. We sorely needed the rain for the drought, lawns, lakes......
A nice start to the rainy season and 90L is to be thanked.