Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 137, NWS Jacksonville, FL

August 21, 2013Columbia County, Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 21, 2013, 2:18 PM EDT for Columbia County, Suwannee County, Florida. It was in force for 42 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 21, 2013, 2:18 PM EDT (18:18 UTC)
Expired: Aug 21, 2013, 3:00 PM EDT
In force: 42 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Columbia County, FL, Suwannee County, FL

The radar

The Moody AFB radar (KVAX), 78 km from the middle of the area, began a volume at 18:19 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, 6.3 hours before the alert went out and 145 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: 1238 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 77 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 Aug 21, 8:36 AM EDT, 5 hours 42 minutes earlier.

Area forecast discussion, Aug 21, 8:36 AM EDT, 5 hours 42 minutes before

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Hazardous weather outlook, Aug 21, 3:50 AM EDT, 10 hours 28 minutes before

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In the hours before

Special weather statement, Aug 21, 12:19 PM EDT, 1 hour 59 minutes before

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Special weather statement, Aug 21, 1:09 PM EDT, 1 hour 9 minutes before

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Special weather statement, Aug 21, 1:19 PM EDT, 59 minutes before

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Special weather statement, Aug 21, 1:44 PM EDT, 34 minutes before

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Special weather statement, Aug 21, 2:05 PM EDT, 13 minutes before

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Special weather statement, Aug 21, 2:13 PM EDT, 5 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 20, 8:57 PM EDT	Areal Flood Advisory	JAX	Marion	48 min
Aug 21, 10:46 AM EDT	Special Weather Statement	JAX	Putnam	44 min
Aug 21, 10:49 AM EDT	Special Weather Statement	JAX	Nassau	41 min
Aug 21, 11:09 AM EDT	Special Weather Statement	JAX	Saint Johns	51 min
Aug 21, 11:40 AM EDT	Special Weather Statement	JAX	Flagler, Saint Johns	50 min
Aug 21, 12:19 PM EDT	Special Weather Statement	JAX	Baker	41 min
Aug 21, 1:44 PM EDT	Special Weather Statement	JAX	Union	46 min
Aug 21, 2:13 PM EDT	Special Weather Statement	JAX	Marion	47 min
Aug 21, 3:01 PM EDT	Special Weather Statement	JAX	Suwannee	44 min
Aug 21, 3:03 PM EDT	Special Weather Statement	JAX	Marion	42 min
Aug 21, 10:34 AM EDT	River Flood Warning	JAX	Pierce, Ware	5 days
Aug 21, 11:04 AM EDT	Special Weather Statement	JAX	Brantley	41 min
Aug 21, 12:16 PM EDT	Special Weather Statement	JAX	Brantley, Pierce	44 min
Aug 21, 1:09 PM EDT	Special Weather Statement	JAX	Clinch, Ware	51 min
Aug 21, 1:19 PM EDT	Special Weather Statement	JAX	Echols	41 min
Aug 21, 2:05 PM EDT	Special Weather Statement	JAX	Clinch	40 min
Aug 21, 2:47 PM EDT	Special Weather Statement	JAX	Atkinson, Coffee, Jeff Davis	43 min
Aug 21, 3:15 PM EDT	Areal Flood Advisory	JAX	Atkinson, Coffee, Jeff Davis	60 min

Nearby

Severe Thunderstorm Warnings in Florida, 2013 Every severe thunderstorm warning in 2013

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.