Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 304, NWS Jacksonville, FL

September 25, 20115 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 25, 2011, 5:36 PM EDT for 5 counties in Georgia. It was in force for 39 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 25, 2011, 5:36 PM EDT (21:36 UTC)
Expired: Sep 25, 2011, 6:15 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Brantley County, GA, Camden County, GA, Charlton County, GA, Pierce County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 80 km from the middle of the area, began a volume at 21:38 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

Charleston AFB, SC (KCHS), launched 12:00Z, 9.6 hours before the alert went out and 268 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: 1927 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 459 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

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 Sep 25, 2:43 PM EDT, 2 hours 53 minutes earlier.

Area forecast discussion, Sep 25, 2:43 PM EDT, 2 hours 53 minutes before

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Hazardous weather outlook, Sep 25, 4:46 AM EDT, 12 hours 50 minutes before

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In the hours before

Special weather statement, Sep 25, 4:42 PM EDT, 54 minutes before

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Special weather statement, Sep 25, 4:51 PM EDT, 45 minutes before

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Special weather statement, Sep 25, 5:04 PM EDT, 32 minutes before

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Special weather statement, Sep 25, 5:10 PM EDT, 26 minutes before

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Special weather statement, Sep 25, 5:26 PM EDT, 10 minutes before

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Special weather statement, Sep 25, 5:28 PM EDT, 8 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
Sep 24, 8:36 PM EDT	Special Weather Statement	JAX	Union	39 min
Sep 24, 9:07 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford	53 min
Sep 25, 2:15 PM EDT	Special Weather Statement	JAX	Alachua	45 min
Sep 25, 2:32 PM EDT	Special Weather Statement	JAX	Citrus	43 min
Sep 25, 2:45 PM EDT	Special Weather Statement	JAX	Suwannee	45 min
Sep 25, 3:21 PM EDT	Areal Flood Advisory	JAX	Suwannee	114 min
Sep 25, 3:28 PM EDT	Special Weather Statement	JAX	Gilchrist	47 min
Sep 25, 3:33 PM EDT	Special Weather Statement	JAX	Alachua	42 min
Sep 25, 4:03 PM EDT	Areal Flood Advisory	JAX	Alachua, Gilchrist	117 min
Sep 25, 4:05 PM EDT	Special Weather Statement	JAX	Union	40 min
Sep 25, 4:06 PM EDT	Special Weather Statement	JAX	Hamilton	54 min
Sep 25, 4:13 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton	31 min
Sep 25, 4:15 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Gilchrist, Suwannee, Union	2 hr
Sep 25, 4:33 PM EDT	Special Weather Statement	JAX	Union	42 min
Sep 25, 4:43 PM EDT	Areal Flood Advisory	JAX	Baker, Columbia, Union	2 hr
Sep 25, 4:51 PM EDT	Special Weather Statement	JAX	Baker	39 min
Sep 25, 5:00 PM EDT	Areal Flood Advisory	JAX	Baker, Nassau	2 hr
Sep 25, 5:26 PM EDT	Special Weather Statement	JAX	Baker	49 min
Sep 25, 5:43 PM EDT	Special Weather Statement	JAX	Putnam	47 min
Sep 25, 5:57 PM EDT	Special Weather Statement	JAX	Duval, Nassau	48 min
Sep 25, 6:11 PM EDT	Special Weather Statement	JAX	Clay	49 min
Sep 25, 6:30 PM EDT	Special Weather Statement	JAX	Duval, Nassau, Saint Johns	45 min
Sep 25, 7:14 PM EDT	Areal Flood Advisory	JAX	Clay, Duval, Nassau, Saint Johns	2 hr
Sep 25, 7:20 PM EDT	Areal Flood Advisory	JAX	Nassau	115 min
Sep 25, 7:24 PM EDT	Special Marine Warning	JAX		96 min
Sep 24, 9:02 PM EDT	Areal Flood Advisory	JAX	Pierce, Wayne	88 min
Sep 24, 9:39 PM EDT	Areal Flood Warning	JAX	Appling, Pierce, Wayne	96 min
Sep 24, 11:02 PM EDT	Areal Flood Warning	JAX	Brantley, Glynn, Wayne	87 min
Sep 24, 11:34 PM EDT	Areal Flood Advisory	JAX	Brantley, Charlton, Pierce, Ware	116 min
Sep 25, 12:41 AM EDT	Areal Flood Warning	JAX	Brantley, Pierce, Ware	2 hr
Sep 25, 1:45 AM EDT	Special Weather Statement	JAX	Wayne	45 min
Sep 25, 2:06 AM EDT	Areal Flood Advisory	JAX	Brantley, Pierce, Wayne	114 min
Sep 25, 3:48 PM EDT	Special Weather Statement	JAX	Clinch	42 min
Sep 25, 4:00 PM EDT	Special Weather Statement	JAX	Ware	45 min
Sep 25, 4:17 PM EDT	Special Weather Statement	JAX	Pierce	43 min
Sep 25, 4:31 PM EDT	Special Weather Statement	JAX	Wayne	59 min
Sep 25, 4:42 PM EDT	Special Weather Statement	JAX	Ware	63 min
Sep 25, 5:04 PM EDT	Special Weather Statement	JAX	Appling, Jeff Davis	41 min
Sep 25, 5:10 PM EDT	Areal Flood Advisory	JAX	Appling, Brantley, Charlton, Pierce, Ware, Wayne	2 hr
Sep 25, 5:10 PM EDT	Special Weather Statement	JAX	Brantley, Wayne	20 min
Sep 25, 5:28 PM EDT	Special Weather Statement	JAX	Brantley, Wayne	62 min
Sep 25, 5:51 PM EDT	Special Weather Statement	JAX	Appling	24 min
Sep 25, 6:26 PM EDT	Special Weather Statement	JAX	Camden, Glynn	64 min
Sep 25, 7:14 PM EDT	Special Weather Statement	JAX	Camden, Glynn	46 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.