Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 249, NWS Jacksonville, FL

August 19, 2009Hamilton County, Suwannee County, Florida; Echols County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 19, 2009, 6:41 PM EDT for Hamilton County, Suwannee County, Florida; Echols County, Georgia. It was in force for 49 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 19, 2009, 6:41 PM EDT (22:41 UTC)
Expired
Aug 19, 2009, 7:30 PM EDT
In force
49 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Hamilton County, FL, Suwannee County, FL, Echols County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 10.7 hours before the alert went out and 130 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, Tallahassee Rgnl, FL at 12:00Z on 2009-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2246 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, Tallahassee Rgnl, FL at 12:00Z on 2009-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
2246 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
495 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 2:10 PM EDTSpecial Weather StatementJAXMarion35 min
Aug 19, 3:10 PM EDTSpecial Weather StatementJAXMarion50 min
Aug 19, 3:11 PM EDTSpecial Weather StatementJAXPutnam49 min
Aug 19, 3:33 PM EDTSpecial Weather StatementJAXPutnam27 min
Aug 19, 3:50 PM EDTSpecial Weather StatementJAXFlagler25 min
Aug 19, 3:55 PM EDTSpecial Weather StatementJAXAlachua35 min
Aug 19, 4:06 PM EDTSpecial Weather StatementJAXBradford39 min
Aug 19, 4:14 PM EDTSpecial Weather StatementJAXAlachua31 min
Aug 19, 4:25 PM EDTSpecial Weather StatementJAXSaint Johns35 min
Aug 19, 4:30 PM EDTSpecial Weather StatementJAXBaker30 min
Aug 19, 4:57 PM EDTSpecial Weather StatementJAXUnion33 min
Aug 19, 5:14 PM EDTSpecial Weather StatementJAXGilchrist31 min
Aug 19, 5:32 PM EDTSpecial Weather StatementJAXColumbia28 min
Aug 19, 5:41 PM EDTSpecial Weather StatementJAXGilchrist34 min
Aug 19, 6:00 PM EDTSpecial Weather StatementJAXSuwannee30 min
Aug 19, 6:17 PM EDTSevere Thunderstorm WarningJAXHamilton, Suwannee28 min
Aug 19, 5:15 PM EDTSpecial Weather StatementJAXJeff Davis30 min
Aug 19, 5:37 PM EDTSpecial Weather StatementJAXAppling23 min
Aug 19, 5:57 PM EDTSpecial Weather StatementJAXClinch33 min
Aug 19, 6:22 PM EDTSpecial Weather StatementJAXAppling38 min
Aug 19, 6:57 PM EDTSpecial Weather StatementJAXAppling33 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009Severe Thunderstorm Warnings in Georgia, 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.