Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 209, NWS Jacksonville, FL

July 24, 2009Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 24, 2009, 4:36 PM EDT for Flagler County, Florida. It was in force for 24 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 24, 2009, 4:36 PM EDT (20:36 UTC)
Expired: Jul 24, 2009, 5:00 PM EDT
In force: 24 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 20:36 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.6 hours before the alert went out and 135 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: 109 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 24, 2:08 PM EDT, 2 hours 28 minutes earlier.

Area forecast discussion, Jul 24, 2:08 PM EDT, 2 hours 28 minutes before

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Hazardous weather outlook, Jul 24, 9:50 AM EDT, 6 hours 46 minutes before

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In the hours before

Special weather statement, Jul 24, 2:02 PM EDT, 2 hours 34 minutes before

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Special weather statement, Jul 24, 3:46 PM EDT, 50 minutes before

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Special weather statement, Jul 24, 3:56 PM EDT, 40 minutes before

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Special weather statement, Jul 24, 4:29 PM EDT, 7 minutes before

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Special weather statement, Jul 24, 4:31 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
Jul 24, 2:02 PM EDT	Special Weather Statement	JAX	Clay	43 min
Jul 24, 3:46 PM EDT	Special Weather Statement	JAX	Saint Johns	29 min
Jul 24, 3:56 PM EDT	Special Weather Statement	JAX	Flagler	49 min
Jul 24, 4:29 PM EDT	Special Weather Statement	JAX	Flagler	31 min
Jul 24, 4:31 PM EDT	Special Weather Statement	JAX	Suwannee	29 min
Jul 24, 4:35 PM EDT	Areal Flood Advisory	JAX	Flagler, Marion, Putnam, Saint Johns	115 min
Jul 24, 4:40 PM EDT	Special Marine Warning	JAX		65 min
Jul 24, 4:59 PM EDT	Special Weather Statement	JAX	Flagler	46 min
Jul 24, 5:02 PM EDT	Special Weather Statement	JAX	Suwannee	28 min
Jul 24, 5:13 PM EDT	Special Weather Statement	JAX	Saint Johns	47 min

Nearby

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.