Alert archive / Georgia / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 197, NWS Jacksonville, FL

August 12, 2004Coffee County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 12, 2004, 8:45 AM EDT for Coffee County, Georgia. It was in force for 45 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: Aug 12, 2004, 8:45 AM EDT (12:45 UTC)
Expired: Aug 12, 2004, 9:30 AM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

County Coffee County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 0.8 hours before the alert went out and 160 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 877 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 5:00 AM EDT, 3 hours 45 minutes earlier.

Area forecast discussion, Aug 12, 5:00 AM EDT, 3 hours 45 minutes before

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Hazardous weather outlook, Aug 12, 8:44 AM EDT, 1 minute before

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In the hours before

Special weather statement, Aug 12, 8:12 AM EDT, 33 minutes before

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Special weather statement, Aug 12, 8:35 AM EDT, 10 minutes before

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The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 2:33 PM EDT	Tornado Warning	JAX	Bradford, Union	27 min
Aug 12, 3:03 PM EDT	Tornado Warning	JAX	Baker, Clay, Duval	27 min
Aug 12, 3:13 PM EDT	Severe Thunderstorm Warning	JAX	Putnam	47 min
Aug 12, 3:25 PM EDT	Special Marine Warning	JAX		65 min
Aug 12, 3:57 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	33 min
Aug 12, 4:01 PM EDT	Tornado Warning	JAX	Duval	44 min
Aug 12, 4:05 PM EDT	Special Marine Warning	JAX		85 min
Aug 12, 4:24 PM EDT	Tornado Warning	JAX	Nassau	21 min
Aug 12, 4:47 PM EDT	Special Marine Warning	JAX		88 min
Aug 12, 5:42 PM EDT	Special Marine Warning	JAX		63 min
Aug 12, 5:55 PM EDT	Tornado Warning	JAX	Flagler	35 min
Aug 12, 5:57 PM EDT	Special Marine Warning	JAX		63 min
Aug 12, 6:52 PM EDT	Special Marine Warning	JAX		68 min
Aug 12, 6:52 PM EDT	Special Marine Warning	JAX		68 min
Aug 12, 6:09 PM EDT	Tornado Warning	JAX	Wayne	36 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2004 Every severe thunderstorm warning in 2004

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.