Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 81, NWS Tampa Bay, FL

August 5, 2009Pinellas County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 5, 2009, 9:45 AM EDT for Pinellas County, Florida. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 5, 2009, 9:45 AM EDT (13:45 UTC)
Expired
Aug 5, 2009, 10:15 AM EDT
In force
30 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

County Pinellas County, FL

The radar

The Tampa radar (KTBW), 40 km from the middle of the area, began a volume at 13:48 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

Jacksonville, FL (KJAX), launched 12:00Z, 1.8 hours before the alert went out and 306 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, Jacksonville, FL at 12:00Z on 2009-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2509 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2009-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
2509 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 5:44 AM EDTSpecial Weather StatementTBWLevy46 min
Aug 5, 9:28 AM EDTSpecial Marine WarningTBW32 min
Aug 5, 9:31 AM EDTSpecial Weather StatementTBWPinellas44 min
Aug 5, 9:55 AM EDTSpecial Marine WarningTBW35 min
Aug 5, 10:22 AM EDTSpecial Weather StatementTBWPinellas38 min
Aug 5, 10:38 AM EDTSpecial Marine WarningTBW23 min
Aug 5, 11:05 AM EDTSpecial Weather StatementTBWHillsborough40 min
Aug 5, 11:24 AM EDTSpecial Marine WarningTBW29 min
Aug 5, 11:35 AM EDTSpecial Weather StatementTBWManatee40 min
Aug 5, 11:37 AM EDTSpecial Weather StatementTBWManatee38 min
Aug 5, 11:42 AM EDTSpecial Marine WarningTBW48 min
Aug 5, 12:19 PM EDTSpecial Weather StatementTBWManatee41 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.