Alert archive / Georgia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 162, NWS Jacksonville, FL

June 22, 2009Nassau County, Florida; 5 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 22, 2009, 6:33 PM EDT for Nassau County, Florida; 5 counties in Georgia. It was in force for 55 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: Jun 22, 2009, 6:33 PM EDT (22:33 UTC)
Expired: Jun 22, 2009, 7:28 PM EDT
In force: 55 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Nassau County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Pierce County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 64 km from the middle of the area, began a volume at 22:34 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 22, 3:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.6 hours before the alert went out and 63 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: 1523 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

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 Jun 22, 4:00 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jun 22, 4:00 PM EDT, 2 hours 33 minutes before

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Hazardous weather outlook, Jun 22, 3:40 PM EDT, 2 hours 53 minutes before

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In the hours before

Local storm report, Jun 22, 5:32 PM EDT, 1 hour 1 minute before

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Local storm report, Jun 22, 5:53 PM EDT, 40 minutes before

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Special weather statement, Jun 22, 5:56 PM EDT, 37 minutes before

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Special weather statement, Jun 22, 5:57 PM EDT, 36 minutes before

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Local storm report, Jun 22, 6:12 PM EDT, 21 minutes before

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Local storm report, Jun 22, 6:27 PM EDT, 6 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
Jun 21, 11:31 PM EDT	Special Marine Warning	JAX		89 min
Jun 22, 12:59 AM EDT	Special Marine Warning	JAX		61 min
Jun 22, 1:32 AM EDT	Special Marine Warning	JAX		88 min
Jun 22, 2:16 AM EDT	Special Marine Warning	JAX		89 min
Jun 22, 3:01 AM EDT	Special Marine Warning	JAX		119 min
Jun 22, 6:47 PM EDT	Special Marine Warning	JAX		92 min
Jun 22, 6:50 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	40 min
Jun 22, 7:14 PM EDT	Special Weather Statement	JAX	Duval	31 min
Jun 22, 7:22 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Saint Johns	53 min
Jun 22, 7:26 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	64 min
Jun 22, 7:33 PM EDT	Special Marine Warning	JAX		87 min
Jun 22, 4:22 PM EDT	Special Weather Statement	JAX	Jeff Davis	53 min
Jun 22, 4:49 PM EDT	Special Weather Statement	JAX	Long	56 min
Jun 22, 4:57 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	63 min
Jun 22, 5:19 PM EDT	Severe Thunderstorm Warning	JAX	Wayne	71 min
Jun 22, 5:50 PM EDT	Severe Thunderstorm Warning	JAX	Bacon, Brantley, Coffee, Pierce, Ware	47 min
Jun 22, 5:56 PM EDT	Special Weather Statement	JAX	Ware	64 min
Jun 22, 5:57 PM EDT	Special Weather Statement	JAX	Glynn	48 min
Jun 22, 6:35 PM EDT	Special Weather Statement	JAX	Camden, Glynn	55 min
Jun 22, 6:42 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Glynn, Wayne	45 min
Jun 22, 7:16 PM EDT	Special Weather Statement	JAX	Camden	44 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2009 Severe Thunderstorm Warnings in Florida, 2009 Every severe thunderstorm warning in 2009

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.