Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 343

April 12, 200410 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2004, 5:43 PM CDT for 10 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 12, 2004, 5:43 PM CDT (22:43 UTC)
Expired: Apr 12, 2004, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bay County, FL, Calhoun County, FL, Franklin County, FL, Gulf County, FL, Holmes County, FL, Liberty County, FL, Okaloosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 72Apr 12, 6:50 PM CDT

The nearest sounding before it

Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 10.7 hours before the alert went out and 104 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: 29 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 3:17 AM CDT	Mesoscale Discussion	SPC	Charlotte, Collier, DeSoto, Hendry, Lee, Manatee and 1 more	88 min
Apr 12, 4:15 AM CDT	Severe Thunderstorm Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more	6 hr
Apr 12, 6:33 AM CDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more	87 min
Apr 12, 1:33 PM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 6 more	117 min
Apr 12, 6:50 PM CDT	Severe Thunderstorm Watch	SPC	Holmes, Jackson	5 hr

Nearby

Mesoscale Discussions in Florida, 2004 Every mesoscale discussion in 2004

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.