Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 181, NWS Jacksonville, FL

July 31, 2012Baker County, Duval County, Nassau County, Florida; Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 31, 2012, 2:53 PM EDT for Baker County, Duval County, Nassau County, Florida; Charlton County, Georgia. It was in force for 26 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: Jul 31, 2012, 2:53 PM EDT (18:53 UTC)
Expired: Jul 31, 2012, 3:19 PM EDT
In force: 26 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Baker County, FL, Duval County, FL, Nassau County, FL, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 25 km from the middle of the area, began a volume at 18:56 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.9 hours before the alert went out and 225 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: 431 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1025 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 31, 2:33 PM EDT, 20 minutes earlier.

Area forecast discussion, Jul 31, 2:33 PM EDT, 20 minutes before

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Hazardous weather outlook, Jul 31, 2:30 PM EDT, 23 minutes before

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In the hours before

Local storm report, Jul 31, 10:22 AM EDT, 4 hours 31 minutes before

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Local storm report, Jul 31, 10:27 AM EDT, 4 hours 26 minutes before

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Local storm report, Jul 31, 10:44 AM EDT, 4 hours 9 minutes before

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Special weather statement, Jul 31, 2:16 PM EDT, 37 minutes before

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Special weather statement, Jul 31, 2:36 PM EDT, 17 minutes before

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Special weather statement, Jul 31, 2:49 PM EDT, 4 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
Jul 31, 2:16 PM EDT	Special Weather Statement	JAX	Nassau	29 min
Jul 31, 2:36 PM EDT	Special Weather Statement	JAX	Baker	24 min
Jul 31, 2:49 PM EDT	Special Weather Statement	JAX	Columbia	41 min
Jul 31, 3:00 PM EDT	Special Marine Warning	JAX		90 min
Jul 31, 3:35 PM EDT	Special Weather Statement	JAX	Baker	25 min
Jul 31, 3:53 PM EDT	Special Marine Warning	JAX		97 min
Jul 31, 4:14 PM EDT	Special Weather Statement	JAX	Nassau	46 min
Jul 31, 4:28 PM EDT	Special Marine Warning	JAX		92 min
Jul 31, 5:15 PM EDT	Special Marine Warning	JAX		90 min
Jul 30, 8:03 PM EDT	Special Weather Statement	JAX	Appling, Bacon, Jeff Davis, Wayne	42 min
Jul 30, 8:44 PM EDT	Special Weather Statement	JAX	Appling, Bacon	46 min
Jul 30, 9:16 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Pierce, Ware	44 min
Jul 30, 9:29 PM EDT	Special Weather Statement	JAX	Coffee	31 min
Jul 30, 9:40 PM EDT	Severe Thunderstorm Warning	JAX	Bacon, Coffee, Ware	50 min
Jul 30, 10:12 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	34 min
Jul 31, 2:57 PM EDT	Special Weather Statement	JAX	Camden	48 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning in 2012

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.