Alert archive / Florida / Mesoscale Discussions in 2005

Mesoscale Discussion 516

April 7, 200510 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2005, 8:52 AM EDT for 10 counties in Florida. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2005, 8:52 AM EDT (12:52 UTC)
Expired: Apr 7, 2005, 10:45 AM EDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Citrus County, FL, Columbia County, FL, Dixie County, FL, Gilchrist County, FL, Lafayette County, FL, Levy County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL

The watches that followed

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

Severe Thunderstorm Watch 137Apr 7, 11:25 AM EDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.9 hours before the alert went out and 120 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: 22 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 6, 8:00 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	4 hr
Apr 6, 11:36 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	54 min
Apr 7, 4:53 AM EDT	Mesoscale Discussion	SPC	Gulf, Jefferson, Lafayette, Leon, Liberty, Madison and 2 more	2 hr
Apr 7, 11:25 AM EDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	8 hr
Apr 7, 1:00 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	2 hr
Apr 7, 4:18 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more	87 min
Apr 7, 5:50 PM EDT	Severe Thunderstorm Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 20 more	6 hr
Apr 7, 7:20 PM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, Collier, DeSoto, Glades, Hardee and 17 more	55 min

Nearby

Mesoscale Discussions in Florida, 2005 Every mesoscale discussion in 2005

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.