Alert archive / Georgia / Mesoscale Discussions in 2004

Mesoscale Discussion 291

April 8, 200411 counties in Alabama; 11 counties in Florida; 43 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2004, 8:50 AM CDT for 11 counties in Alabama; 11 counties in Florida; 43 counties in Georgia. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 8, 2004, 8:50 AM CDT (13:50 UTC)
Expired
Apr 8, 2004, 10:15 AM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 65 counties

Barbour County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Pike County, AL, Calhoun County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington 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, Calhoun County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Pierce County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Webster County, GA, Wilcox 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, 1.8 hours before the alert went out and 95 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 2004-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1201 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 2004-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 212 square meters per square second.1939587897117Sfc1 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
1201 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
212 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
1.6
Supercell composite
7.0

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
Apr 7, 8:53 PM CDTMesoscale DiscussionSPCAutauga, Butler, Chilton, Choctaw, Clarke, Conecuh and 11 more67 min
Apr 8, 9:10 AM CDTSevere Thunderstorm WatchSPCBarbour, Bullock, Butler, Coffee, Conecuh, Covington and 12 more7 hr
Apr 8, 12:11 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Butler, Coffee, Conecuh, Covington and 12 more2 hr
Apr 8, 12:56 PM CDTMesoscale DiscussionSPCChambers, Clay, Cleburne, Lee, Macon, Randolph and 1 more3 hr
Apr 8, 9:16 AM CDTMesoscale DiscussionSPCAlachua, Bradford, Citrus, Clay, Duval, Flagler and 13 more119 min
Apr 8, 9:45 AM CDTSevere Thunderstorm WatchSPCAlachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 11 more6 hr
Apr 8, 11:42 AM CDTMesoscale DiscussionSPCAlachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 11 more2 hr
Apr 8, 2:35 PM CDTMesoscale DiscussionSPCBrevard, Hardee, Highlands, Hillsborough, Indian River, Okeechobee and 6 more55 min
Apr 8, 2:40 PM CDTMesoscale DiscussionSPCNassau65 min

Nearby

Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in Alabama, 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.