Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 591

April 25, 200310 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 11:52 PM EDT for 10 counties in Florida. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 25, 2003, 11:52 PM EDT (03:52 UTC)
Expired: Apr 26, 2003, 2:45 AM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties DeSoto County, FL, Glades County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Manatee County, FL, Okeechobee County, FL, Osceola County, FL, Polk County, FL, Sarasota County, FL

The radar

The Melbourne radar (KMLB), 90 km from the middle of the area, began a volume at 03:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 3.9 hours before the alert went out and 105 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: 1699 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.1

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 25, 8:22 PM EDT	Mesoscale Discussion	SPC	Gadsden, Holmes, Jackson, Walton, Washington	113 min
Apr 25, 10:00 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 6 more	5 hr
Apr 26, 12:24 AM EDT	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Leon, Walton and 1 more	96 min
Apr 26, 2:12 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Clay and 24 more	63 min
Apr 26, 10:53 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 14 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2003 Every mesoscale discussion in 2003

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; radar from the NEXRAD Level II archive.