Alert archive / Georgia / Mesoscale Discussions in 2004

Mesoscale Discussion 1973

August 12, 200425 counties in Florida; 36 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2004, 12:50 PM EDT for 25 counties in Florida; 36 counties in Georgia. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Aug 12, 2004, 12:50 PM EDT (16:50 UTC)
Expired
Aug 12, 2004, 1:45 PM EDT
In force
55 min
Issued by
the Storm Prediction Center
All 61 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Mitchell County, GA, Pierce County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Worth County, GA

The watches that followed

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.8 hours before the alert went out and 100 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2004-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1178 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2004-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1178 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

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.

IssuedProductOfficeCountiesLasted
Aug 12, 8:00 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Columbia and 18 more3 hr
Aug 12, 8:50 AM EDTTornado WatchSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 23 more5 hr
Aug 12, 1:50 PM EDTTornado WatchSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 30 more7 hr
Aug 12, 7:02 PM EDTMesoscale DiscussionSPCBrevard, Clay, Duval, Flagler, Hardee, Indian River and 9 more88 min
Aug 12, 4:09 AM EDTMesoscale DiscussionSPCBarrow, Bartow, Carroll, Cherokee, Clayton, Cobb and 14 more3 hr
Aug 12, 10:02 AM EDTMesoscale DiscussionSPCBleckley, Bulloch, Burke, Candler, Columbia, Effingham and 13 more88 min
Aug 12, 11:45 AM EDTTornado WatchSPCBleckley, Bryan, Bulloch, Burke, Candler, Chatham and 25 more6 hr
Aug 12, 4:06 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more84 min

Nearby

Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in Florida, 2004Every 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.