Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 338

April 12, 20047 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2004, 4:17 AM EDT for 7 counties in Florida. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Apr 12, 2004, 4:17 AM EDT (08:17 UTC)
Expired: Apr 12, 2004, 5:45 AM EDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Charlotte County, FL, Collier County, FL, DeSoto County, FL, Hendry County, FL, Lee County, FL, Manatee County, FL, Sarasota County, FL

The watches that followed

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

Severe Thunderstorm Watch 69Apr 12, 5:15 AM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 8.3 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: 801 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

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, 5:15 AM EDT	Severe Thunderstorm Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more	6 hr
Apr 12, 7:33 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more	87 min
Apr 12, 2:33 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 6 more	117 min
Apr 12, 6:43 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gulf, Holmes, Liberty and 4 more	2 hr
Apr 12, 7:50 PM EDT	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.