Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 2471

November 24, 20049 counties in Florida; Brantley County, Charlton County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 24, 2004, 6:36 PM EST for 9 counties in Florida; Brantley County, Charlton County, Georgia. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Nov 24, 2004, 6:36 PM EST (23:36 UTC)
Expired: Nov 24, 2004, 7:00 PM EST
In force: 24 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Gilchrist County, FL, Levy County, FL, Marion County, FL, Union County, FL, Brantley County, GA, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 137 km from the middle of the area, began a volume at 23:37 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.6 hours before the alert went out and 192 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: 1093 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.1

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
Nov 24, 6:20 AM EST	Tornado Watch	SPC	Escambia, Santa Rosa	6 hr
Nov 24, 8:11 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more	64 min
Nov 24, 9:03 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more	57 min
Nov 24, 9:30 AM EST	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more	6 hr
Nov 24, 12:24 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more	2 hr
Nov 24, 2:50 PM EST	Tornado Watch	SPC	Baker, Columbia, Dixie, Gilchrist, Hamilton, Jefferson and 6 more	4 hr
Nov 24, 4:30 PM EST	Mesoscale Discussion	SPC	Baker, Citrus, Columbia, Gilchrist, Hamilton, Hernando and 4 more	2 hr
Nov 23, 10:00 PM EST	Mesoscale Discussion	SPC	Dade	2 hr
Nov 24, 8:25 AM EST	Tornado Watch	SPC	Barrow, Bartow, Bibb, Butts, Carroll, Chattahoochee and 44 more	6 hr
Nov 24, 10:23 AM EST	Mesoscale Discussion	SPC	Baldwin, Barrow, Bartow, Bibb, Bleckley, Bryan and 90 more	97 min
Nov 24, 10:40 AM EST	Tornado Watch	SPC	Baldwin, Bleckley, Bryan, Bulloch, Burke, Candler and 40 more	6 hr
Nov 24, 2:13 PM EST	Mesoscale Discussion	SPC	Baldwin, Bleckley, Bryan, Bulloch, Burke, Candler and 40 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2004 Mesoscale Discussions in Georgia, 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; radar from the NEXRAD Level II archive.