Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 298, NWS Jacksonville, FL

July 12, 2008Hamilton County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 12, 2008, 5:09 PM EDT for Hamilton County, Florida. It was in force for 18 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 12, 2008, 5:09 PM EDT (21:09 UTC)
Expired: Jul 12, 2008, 5:27 PM EDT
In force: 18 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Hamilton County, FL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.2 hours before the alert went out and 130 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: 2130 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 546 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 8:03 PM EDT	Areal Flood Advisory	JAX	Clay, Duval	117 min
Jul 12, 3:30 PM EDT	Areal Flood Advisory	JAX	Duval, Saint Johns	2 hr
Jul 12, 5:22 PM EDT	Areal Flood Advisory	JAX	Columbia	83 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.