Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 59, NWS Tampa Bay, FL

September 8, 2023Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Sep 8, 2023, 1:54 PM EDT for Polk County, Florida. It was in force for 21 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
Sep 8, 2023, 1:54 PM EDT (17:54 UTC)
Expired
Sep 8, 2023, 2:15 PM EDT
In force
21 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Polk County, FL

The radar

The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 17:52 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, 5.9 hours before the alert went out and 131 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 2023-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1371 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 2023-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 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
1371 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1086 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
8 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
Sep 8, 10:32 AM EDTSpecial Marine WarningTBW58 min
Sep 8, 10:41 AM EDTSpecial Marine WarningTBW34 min
Sep 8, 11:18 AM EDTSpecial Weather StatementTBWManatee27 min
Sep 8, 11:27 AM EDTSpecial Marine WarningTBW63 min
Sep 8, 11:49 AM EDTSpecial Weather StatementTBWManatee26 min
Sep 8, 11:49 AM EDTSpecial Weather StatementTBWManatee26 min
Sep 8, 12:27 PM EDTSpecial Weather StatementTBWHernando33 min
Sep 8, 12:47 PM EDTSpecial Weather StatementTBWHernando28 min
Sep 8, 1:42 PM EDTSpecial Weather StatementTBWHighlands48 min
Sep 8, 1:48 PM EDTSpecial Weather StatementTBWPolk42 min
Sep 8, 1:59 PM EDTSpecial Marine WarningTBW61 min
Sep 8, 2:28 PM EDTSpecial Marine WarningTBW32 min

Nearby

Severe Thunderstorm Warnings in Florida, 2023Every severe thunderstorm warning in 2023

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.