Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 309, NWS Tallahassee, FL

December 25, 2009Madison County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Dec 25, 2009, 5:20 AM EST for Madison County, Florida. It was in force for 25 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
Dec 25, 2009, 5:20 AM EST (10:20 UTC)
Expired
Dec 25, 2009, 5:45 AM EST
In force
25 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

County Madison County, FL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Dec 25, 3:46 AM ESTTornado WatchSPC7 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 10.3 hours before the alert went out and 80 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2009-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2009-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 500 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
909 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
500 m²/s²
0-3 km storm-relative helicity
677 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 24, 9:37 PM ESTSevere Thunderstorm WarningTAEHolmes, Walton20 min
Dec 24, 10:32 PM ESTSpecial Marine WarningTAE43 min
Dec 24, 11:01 PM ESTSevere Thunderstorm WarningTAEBay, Gulf44 min
Dec 25, 3:41 AM ESTSpecial Marine WarningTAE64 min
Dec 25, 2:36 PM ESTFire Weather WatchTAEBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 10 more15 hr
Dec 25, 4:47 AM ESTSevere Thunderstorm WarningTAEBen Hill, Irwin43 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009Every 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.