Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 29, NWS Tampa Bay, FL

May 21, 2020Highlands County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 21, 2020, 4:40 PM EDT for Highlands County, Florida. It was in force for 35 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
May 21, 2020, 4:40 PM EDT (20:40 UTC)
Expired
May 21, 2020, 5:15 PM EDT
In force
35 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Highlands County, FL

The radar

The Melbourne radar (KMLB), 109 km from the middle of the area, began a volume at 20:44 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, 8.7 hours before the alert went out and 150 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 2020-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 584 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 2020-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
584 J/kg
Mixed-layer CIN
-172 J/kg
Mixed-layer LCL
1196 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
19 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
May 21, 4:10 PM EDTSpecial Weather StatementTBWSumter35 min
May 21, 4:26 PM EDTSevere Thunderstorm WarningTBWSumter34 min
May 21, 4:58 PM EDTSpecial Weather StatementTBWSumter47 min
May 21, 5:00 PM EDTSpecial Weather StatementTBWHighlands45 min
May 21, 5:35 PM EDTSpecial Weather StatementTBWDeSoto40 min
May 21, 6:17 PM EDTSpecial Weather StatementTBWPolk28 min
May 21, 6:46 PM EDTSpecial Weather StatementTBWCharlotte29 min
May 21, 6:52 PM EDTSpecial Weather StatementTBWPolk38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020Every severe thunderstorm warning in 2020

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.