Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 141, NWS Jacksonville, FL

September 4, 2013Nassau County, Florida; Camden County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 4, 2013, 6:48 PM EDT for Nassau County, Florida; Camden County, Georgia. 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: Sep 4, 2013, 6:48 PM EDT (22:48 UTC)
Expired: Sep 4, 2013, 7:30 PM EDT
In force: 42 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Nassau County, FL, Camden County, GA

The radar

The Jacksonville radar (KJAX), 31 km from the middle of the area, began a volume at 22:48 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

Jacksonville, FL (KJAX), launched 12:00Z, 10.8 hours before the alert went out and 30 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: 1661 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 848 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 0 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 Sep 4, 3:10 PM EDT, 3 hours 38 minutes earlier.

Area forecast discussion, Sep 4, 3:10 PM EDT, 3 hours 38 minutes before

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Hazardous weather outlook, Sep 4, 3:32 AM EDT, 15 hours 16 minutes before

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In the hours before

Special weather statement, Sep 4, 5:33 PM EDT, 1 hour 15 minutes before

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Special weather statement, Sep 4, 6:01 PM EDT, 47 minutes before

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Special weather statement, Sep 4, 6:21 PM EDT, 27 minutes before

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Special weather statement, Sep 4, 6:31 PM EDT, 17 minutes before

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Special weather statement, Sep 4, 6:33 PM EDT, 15 minutes before

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Special weather statement, Sep 4, 6:45 PM EDT, 3 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 4, 2:09 PM EDT	Special Weather Statement	JAX	Marion	51 min
Sep 4, 3:08 PM EDT	Special Weather Statement	JAX	Marion	37 min
Sep 4, 3:25 PM EDT	Special Weather Statement	JAX	Flagler	35 min
Sep 4, 3:37 PM EDT	Special Weather Statement	JAX	Marion	38 min
Sep 4, 3:40 PM EDT	Areal Flood Advisory	JAX	Flagler	2 hr
Sep 4, 3:46 PM EDT	Special Weather Statement	JAX	Flagler	44 min
Sep 4, 4:38 PM EDT	Special Weather Statement	JAX	Marion	37 min
Sep 4, 4:42 PM EDT	Special Weather Statement	JAX	Saint Johns	33 min
Sep 4, 4:44 PM EDT	Severe Thunderstorm Warning	JAX	Putnam, Saint Johns	46 min
Sep 4, 5:02 PM EDT	Special Weather Statement	JAX	Putnam	28 min
Sep 4, 5:33 PM EDT	Special Weather Statement	JAX	Clay	27 min
Sep 4, 6:21 PM EDT	Special Weather Statement	JAX	Clay	24 min
Sep 4, 6:31 PM EDT	Special Weather Statement	JAX	Nassau	29 min
Sep 4, 6:33 PM EDT	Special Weather Statement	JAX	Alachua	42 min
Sep 4, 6:45 PM EDT	Special Weather Statement	JAX	Baker	30 min
Sep 4, 7:20 PM EDT	Special Weather Statement	JAX	Union	40 min
Sep 4, 7:31 PM EDT	Special Weather Statement	JAX	Baker	29 min
Sep 4, 3:13 PM EDT	Special Weather Statement	JAX	Glynn	32 min
Sep 4, 3:19 PM EDT	Special Weather Statement	JAX	Glynn	26 min
Sep 4, 3:49 PM EDT	Special Weather Statement	JAX	Glynn	26 min
Sep 4, 3:50 PM EDT	Special Weather Statement	JAX	Glynn	25 min
Sep 4, 4:02 PM EDT	Special Weather Statement	JAX	Glynn	43 min
Sep 4, 4:24 PM EDT	Special Weather Statement	JAX	Glynn	51 min
Sep 4, 4:33 PM EDT	Severe Thunderstorm Warning	JAX	Glynn	42 min
Sep 4, 4:58 PM EDT	Special Weather Statement	JAX	Brantley	47 min
Sep 4, 5:20 PM EDT	Special Weather Statement	JAX	Camden	40 min
Sep 4, 6:01 PM EDT	Special Weather Statement	JAX	Camden	29 min
Sep 4, 7:16 PM EDT	Special Weather Statement	JAX	Charlton	29 min
Sep 4, 7:55 PM EDT	Special Weather Statement	JAX	Charlton	35 min

Nearby

Severe Thunderstorm Warnings in Florida, 2013 Severe Thunderstorm Warnings in Georgia, 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.