Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 273, NWS Jacksonville, FL

August 18, 2011Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 18, 2011, 3:14 PM EDT for Flagler County, Florida. It was in force for 31 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 18, 2011, 3:14 PM EDT (19:14 UTC)
Expired
Aug 18, 2011, 3:45 PM EDT
In force
31 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 19:14 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.2 hours before the alert went out and 135 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, Cape Canaveral, FL at 12:00Z on 2011-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 461 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, Cape Canaveral, FL at 12:00Z on 2011-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 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
461 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1026 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
-11 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 18, 1:42 PM EDTSpecial Weather StatementJAXMarion33 min
Aug 18, 1:44 PM EDTSpecial Weather StatementJAXGilchrist31 min
Aug 18, 2:35 PM EDTSpecial Weather StatementJAXMarion40 min
Aug 18, 3:09 PM EDTSpecial Weather StatementJAXFlagler36 min
Aug 18, 3:19 PM EDTSpecial Weather StatementJAXPutnam41 min
Aug 18, 3:35 PM EDTAreal Flood AdvisoryJAXClay, Duval55 min
Aug 18, 3:51 PM EDTSpecial Weather StatementJAXPutnam39 min
Aug 18, 3:52 PM EDTSpecial Weather StatementJAXFlagler38 min
Aug 18, 3:55 PM EDTSpecial Weather StatementJAXBradford, Clay35 min
Aug 18, 4:30 PM EDTSpecial Weather StatementJAXPutnam30 min
Aug 18, 4:31 PM EDTAreal Flood AdvisoryJAXBradford, Clay44 min
Aug 18, 4:49 PM EDTSpecial Weather StatementJAXSaint Johns26 min
Aug 18, 5:12 PM EDTAreal Flood AdvisoryJAXHamilton48 min
Aug 18, 4:46 PM EDTSpecial Weather StatementJAXCharlton29 min
Aug 18, 5:16 PM EDTSpecial Weather StatementJAXCamden29 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every severe thunderstorm warning in 2011

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.