Alert archive / Florida / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 306

May 20, 20054 counties in Alabama; 20 counties in Florida; 7 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at May 20, 2005, 7:15 PM CDT for 4 counties in Alabama; 20 counties in Florida; 7 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2005, 7:15 PM CDT (00:15 UTC)
Expired
May 21, 2005, 1:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 31 counties

Baldwin County, AL, Escambia County, AL, Mobile County, AL, Washington County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Forrest County, MS, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 20, 9:56 PM CDTSevere Thunderstorm WarningJANCovington, Forrest, Jefferson Davis, Lamar49 min
May 20, 10:35 PM CDTSevere Thunderstorm WarningTAEJackson40 min

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 00:00Z, 0.3 hours before the alert went out and 245 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 00:00Z on 2005-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 482 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 00:00Z on 2005-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
482 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1639 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
54 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
May 20, 10:37 PM CDTMesoscale DiscussionSPCButler, Choctaw, Clarke, Coffee, Conecuh, Covington and 8 more83 min
May 20, 8:40 PM CDTMesoscale DiscussionSPCClaiborne, Copiah, Covington, Franklin, Hinds, Issaquena and 10 more95 min

Nearby

Severe Thunderstorm Watches in Florida, 2005Severe Thunderstorm Watches in Mississippi, 2005Severe Thunderstorm Watches in Alabama, 2005Every severe thunderstorm watch in 2005

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.