Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 11, NWS Jacksonville, FL

February 23, 2008Alachua County, Gilchrist County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Feb 23, 2008, 1:47 AM EST for Alachua County, Gilchrist County, Florida. It was in force for 28 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: Feb 23, 2008, 1:47 AM EST (06:47 UTC)
Expired: Feb 23, 2008, 2:15 AM EST
In force: 28 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Alachua County, FL, Gilchrist County, FL

The radar

The Jacksonville radar (KJAX), 121 km from the middle of the area, began a volume at 06:49 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 00:00Z, 6.8 hours before the alert went out and 183 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: 375 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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 Feb 22, 8:07 PM EST, 5 hours 40 minutes earlier.

Area forecast discussion, Feb 22, 8:07 PM EST, 5 hours 40 minutes before

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Hazardous weather outlook, Feb 22, 9:48 PM EST, 3 hours 59 minutes before

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In the hours before

Special weather statement, Feb 23, 1:16 AM EST, 31 minutes before

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Special weather statement, Feb 23, 1:18 AM EST, 29 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
Feb 23, 2:44 AM EST	Severe Thunderstorm Warning	JAX	Putnam, Saint Johns	46 min
Feb 23, 3:01 AM EST	Special Marine Warning	JAX		119 min
Feb 23, 1:26 PM EST	Fire Weather Watch	JAX	Baker, Gilchrist, Suwannee, Union	13 hr
Feb 23, 11:19 AM EST	River Flood Warning	JAX	Appling	6 days

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.