Alert archive / Florida / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 20, NWS Tampa Bay, FL

April 30, 2014Hernando County, Pasco County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 30, 2014, 3:49 PM EDT for Hernando County, Pasco County, Florida. It was in force for 26 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
Apr 30, 2014, 3:49 PM EDT (19:49 UTC)
Expired
Apr 30, 2014, 4:15 PM EDT
In force
26 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

Counties Hernando County, FL, Pasco County, FL

The radar

The Tampa radar (KTBW), 81 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 191 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 2014-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1224 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 2014-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
1224 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
937 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 11:10 PM EDTAreal Flood AdvisoryTBWHighlands, Polk95 min
Apr 30, 2:01 PM EDTSpecial Weather StatementTBWHernando44 min
Apr 30, 2:19 PM EDTSpecial Weather StatementTBWHighlands41 min
Apr 30, 2:45 PM EDTSpecial Weather StatementTBWSumter45 min
Apr 30, 2:59 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Sumter31 min
Apr 30, 3:29 PM EDTSpecial Weather StatementTBWHernando31 min
Apr 30, 4:16 PM EDTSpecial Weather StatementTBWPasco29 min
Apr 30, 4:37 PM EDTSpecial Weather StatementTBWPolk38 min
Apr 30, 5:15 PM EDTSpecial Weather StatementTBWCharlotte30 min
Apr 30, 5:56 PM EDTAreal Flood AdvisoryTBWPolk2 hr
Apr 30, 7:53 PM EDTAreal Flood AdvisoryTBWHardee, Polk82 min

Nearby

Severe Thunderstorm Warnings in Florida, 2014Every severe thunderstorm warning in 2014

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.