Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 580

April 25, 200316 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 3:17 PM EDT for 16 counties in Florida. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2003, 3:17 PM EDT (19:17 UTC)
Expired: Apr 25, 2003, 5:15 PM EDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hernando County, FL, Levy County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Union County, FL, Volusia County, FL

The radar

The Jacksonville radar (KJAX), 91 km from the middle of the area, began a volume at 19:21 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

Jacksonville, FL (KJAX), launched 12:00Z, 7.3 hours before the alert went out and 93 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: 109 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 1059 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 4:05 AM EDT	Mesoscale Discussion	SPC	Escambia	85 min
Apr 25, 6:40 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more	65 min
Apr 25, 7:05 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more	6 hr
Apr 25, 8:41 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more	94 min
Apr 25, 10:22 AM EDT	Mesoscale Discussion	SPC	Gadsden, Hamilton, Jefferson, Leon, Liberty, Madison and 1 more	113 min
Apr 25, 11:45 AM EDT	Severe Thunderstorm Watch	SPC	Baker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 3 more	5 hr
Apr 25, 1:01 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more	119 min
Apr 25, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	Alachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more	5 hr
Apr 25, 6:35 PM EDT	Mesoscale Discussion	SPC	Citrus, Hernando, Lake, Orange, Pasco, Seminole and 2 more	55 min

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.