Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Tampa Bay, FL

May 12, 2009DeSoto County, Highlands County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 12, 2009, 6:27 PM EDT for DeSoto County, Highlands County, Florida. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 12, 2009, 6:27 PM EDT (22:27 UTC)
Expired
May 12, 2009, 7:00 PM EDT
In force
33 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

Counties DeSoto County, FL, Highlands County, FL

The radar

The Tampa radar (KTBW), 96 km from the middle of the area, began a volume at 22:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 10.5 hours before the alert went out and 96 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2009-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1274 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2009-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1274 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
756 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KTBW 122227
SVRTBW
FLC027-055-122300-
/O.NEW.KTBW.SV.W.0021.090512T2227Z-090512T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
627 PM EDT TUE MAY 12 2009

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DESOTO COUNTY IN FLORIDA.
  WESTERN HIGHLANDS COUNTY IN FLORIDA.

* UNTIL 700 PM EDT

* AT 625 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER
  SOUTHWESTERN HIGHLANDS COUNTY...OR 15 MILES SOUTHWEST OF LAKE
  PLACID...AND MOVING NORTH AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHEASTERN DESOTO COUNTY.
  RURAL WESTERN HIGHLANDS COUNTY.

LAT...LON 2733 8167 2733 8147 2711 8147 2711 8163
TIME...MOT...LOC 2227Z 181DEG 8KT 2716 8155

$$
1 follow-up statement
000 
WWUS52 KTBW 122257
SVSTBW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
657 PM EDT TUE MAY 12 2009

FLC027-055-122307-
/O.EXP.KTBW.SV.W.0021.000000T0000Z-090512T2300Z/
DESOTO FL-HIGHLANDS FL-
657 PM EDT TUE MAY 12 2009

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN HIGHLANDS AND
NORTHEASTERN DESOTO COUNTIES WILL EXPIRE AT 700 PM EDT...

THE STORM WILL CONTINUE TO PRODUCE NON-SEVERE WEATHER OVER...
  RURAL WESTERN HIGHLANDS COUNTY.

ALTHOUGH THE STORM HAS WEAKENED BELOW SEVERE LIMITS IT WILL CONTINUE
TO PRODUCE STRONG GUSTY WINDS...HEAVY RAIN...AND SMALL HAIL UNTIL IT
FULLY DISSIPATES.

LAT...LON 2733 8167 2733 8147 2711 8147 2711 8163
TIME...MOT...LOC 2257Z 181DEG 8KT 2725 8151

$$

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 8:58 PM EDTSpecial Weather StatementTBWPolk32 min
May 12, 2:39 PM EDTSpecial Weather StatementTBWPasco36 min
May 12, 2:44 PM EDTSpecial Weather StatementTBWCitrus46 min
May 12, 2:52 PM EDTSevere Thunderstorm WarningTBWCitrus23 min
May 12, 3:09 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando36 min
May 12, 3:11 PM EDTSpecial Marine WarningTBW34 min
May 12, 3:39 PM EDTSevere Thunderstorm WarningTBWHernando, Pasco36 min
May 12, 3:52 PM EDTSevere Thunderstorm WarningTBWCitrus, Sumter23 min
May 12, 4:02 PM EDTSevere Thunderstorm WarningTBWHernando, Pasco28 min
May 12, 4:15 PM EDTSevere Thunderstorm WarningTBWPasco30 min
May 12, 4:19 PM EDTSevere Thunderstorm WarningTBWHillsborough26 min
May 12, 4:29 PM EDTSevere Thunderstorm WarningTBWHernando, Pasco, Sumter16 min
May 12, 4:30 PM EDTAreal Flood AdvisoryTBWHernando, Pasco2 hr
May 12, 4:41 PM EDTSevere Thunderstorm WarningTBWPolk, Sumter34 min
May 12, 4:42 PM EDTSevere Thunderstorm WarningTBWHillsborough, Polk48 min
May 12, 4:58 PM EDTSpecial Weather StatementTBWLee47 min
May 12, 5:20 PM EDTSevere Thunderstorm WarningTBWHardee, Manatee25 min
May 12, 5:28 PM EDTSpecial Marine WarningTBW47 min
May 12, 5:28 PM EDTSevere Thunderstorm WarningTBWPolk32 min
May 12, 5:30 PM EDTSevere Thunderstorm WarningTBWHillsborough30 min
May 12, 5:35 PM EDTAreal Flood AdvisoryTBWPolk55 min
May 12, 5:37 PM EDTAreal Flood AdvisoryTBWHillsborough60 min
May 12, 5:51 PM EDTSpecial Weather StatementTBWDeSoto, Hardee39 min
May 12, 5:54 PM EDTSpecial Marine WarningTBW51 min
May 12, 6:44 PM EDTSpecial Marine WarningTBW46 min
May 12, 7:00 PM EDTSevere Thunderstorm WarningTBWHighlands30 min
May 12, 7:29 PM EDTSevere Thunderstorm WarningTBWHighlands31 min
May 12, 7:33 PM EDTSpecial Marine WarningTBW42 min
May 12, 7:37 PM EDTAreal Flood AdvisoryTBWHighlands113 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.