Alert archive / Florida / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 117

April 8, 200321 counties in Florida; 7 counties in Georgia

The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2003, 1:00 PM EDT for 21 counties in Florida; 7 counties in Georgia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 2003, 1:00 PM EDT (17:00 UTC)
Expired
Apr 8, 2003, 6:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 28 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Lowndes County, GA, Thomas County, GA

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.0 hours before the alert went out and 155 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 2003-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 38 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, Tallahassee Rgnl, FL at 12:00Z on 2003-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.19395878Sfc1 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
38 J/kg
Mixed-layer CIN
-151 J/kg
Mixed-layer LCL
688 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 9:13 PM EDTMesoscale DiscussionSPCCalhoun, Escambia, Gadsden, Jackson, Okaloosa, Santa Rosa and 2 more62 min
Apr 8, 11:32 AM EDTMesoscale DiscussionSPCAlachua, Bradford, Clay, Dixie, Flagler, Franklin and 9 more3 hr
Apr 8, 2:32 PM EDTMesoscale DiscussionSPCAlachua, Bradford, Clay, Dixie, Flagler, Franklin and 9 more118 min
Apr 8, 4:51 PM EDTMesoscale DiscussionSPCAlachua, Bradford, Clay, Dixie, Flagler, Franklin and 9 more114 min

Nearby

Severe Thunderstorm Watches in Florida, 2003Severe Thunderstorm Watches in Georgia, 2003Every severe thunderstorm watch in 2003

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.