Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 313, NWS Jacksonville, FL

July 22, 2008Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 22, 2008, 4:31 PM EDT for Nassau County, Florida. It was in force for 23 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 22, 2008, 4:31 PM EDT (20:31 UTC)
Expired: Jul 22, 2008, 4:54 PM EDT
In force: 23 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 20:34 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.5 hours before the alert went out and 243 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: 1750 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: -10 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 22, 3:10 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Jul 22, 3:10 PM EDT, 1 hour 21 minutes before

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Hazardous weather outlook, Jul 22, 3:22 PM EDT, 1 hour 9 minutes before

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In the hours before

Special weather statement, Jul 22, 3:18 PM EDT, 1 hour 13 minutes before

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Local storm report, Jul 22, 3:35 PM EDT, 56 minutes before

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Special weather statement, Jul 22, 3:40 PM EDT, 51 minutes before

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Special weather statement, Jul 22, 4:02 PM EDT, 29 minutes before

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Special weather statement, Jul 22, 4:07 PM EDT, 24 minutes before

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Special weather statement, Jul 22, 4:19 PM EDT, 12 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 22, 3:32 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	22 min
Jul 22, 3:42 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	48 min
Jul 22, 3:46 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	32 min
Jul 22, 3:53 PM EDT	Special Marine Warning	JAX		97 min
Jul 22, 3:53 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	52 min
Jul 22, 4:07 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	38 min
Jul 22, 5:01 PM EDT	Special Marine Warning	JAX		59 min
Jul 22, 5:08 PM EDT	Areal Flood Advisory	JAX	Duval	112 min
Jul 22, 5:55 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton	35 min
Jul 22, 6:07 PM EDT	Areal Flood Advisory	JAX	Columbia, Hamilton, Suwannee	53 min
Jul 22, 6:12 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Saint Johns	19 min
Jul 22, 6:27 PM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	48 min
Jul 22, 7:10 PM EDT	Areal Flood Advisory	JAX	Columbia, Hamilton, Suwannee	95 min
Jul 22, 7:13 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	19 min
Jul 21, 8:04 PM EDT	Areal Flood Advisory	JAX	Appling, Wayne	56 min
Jul 21, 8:43 PM EDT	Areal Flood Advisory	JAX	Jeff Davis	62 min
Jul 21, 8:54 PM EDT	Severe Thunderstorm Warning	JAX	Jeff Davis	36 min
Jul 21, 9:09 PM EDT	Severe Thunderstorm Warning	JAX	Bacon, Coffee	51 min
Jul 21, 9:13 PM EDT	Areal Flood Advisory	JAX	Appling, Bacon, Coffee, Jeff Davis	62 min
Jul 22, 2:33 PM EDT	Severe Thunderstorm Warning	JAX	Camden	27 min
Jul 22, 2:41 PM EDT	Severe Thunderstorm Warning	JAX	Clinch, Ware	49 min
Jul 22, 6:07 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Clinch, Coffee, Ware	38 min
Jul 22, 7:15 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	32 min

Nearby

Severe Thunderstorm Warnings in Florida, 2008 Every severe thunderstorm warning in 2008

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.