Alert archive / Georgia / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 820

December 31, 200210 counties in Florida; 23 counties in Georgia

The Storm Prediction Center issued this severe thunderstorm watch at Dec 31, 2002, 4:55 PM EST for 10 counties in Florida; 23 counties in Georgia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Dec 31, 2002, 4:55 PM EST (21:55 UTC)
Expired
Dec 31, 2002, 10:00 PM EST
In force
5 hr
Issued by
the Storm Prediction Center
All 33 counties

Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Hamilton County, FL, Lafayette County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Telfair County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.9 hours before the alert went out and 182 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 2002-12-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2002-12-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 300 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1011 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
300 m²/s²
0-3 km storm-relative helicity
360 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 31, 3:50 AM ESTTornado WatchSPCEscambia, Santa Rosa5 hr
Dec 31, 8:35 AM ESTTornado WatchSPCBay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 6 more5 hr
Dec 31, 1:30 PM ESTSevere Thunderstorm WatchSPCCalhoun, Columbia, Gadsden, Gulf, Hamilton, Jefferson and 7 more6 hr
Dec 31, 4:05 PM ESTSevere Thunderstorm WatchSPCAlachua, Charlotte, Citrus, DeSoto, Dixie, Flagler and 24 more6 hr

Nearby

Severe Thunderstorm Watches in Georgia, 2002Severe Thunderstorm Watches in Florida, 2002Every severe thunderstorm watch in 2002

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.