Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 341

April 12, 200424 counties in Alabama; 12 counties in Florida; 11 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2004, 1:33 PM CDT for 24 counties in Alabama; 12 counties in Florida; 11 counties in Georgia. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2004, 1:33 PM CDT (18:33 UTC)
Expired
Apr 12, 2004, 3:30 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 47 counties

Autauga County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Chilton County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Decatur County, GA, Early County, GA, Miller County, GA, Muscogee County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart 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

Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 6.6 hours before the alert went out and 92 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, Eglin AFB/Valpar, FL at 12:00Z on 2004-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 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, Eglin AFB/Valpar, FL at 12:00Z on 2004-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897Sfc1 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
29 J/kg
Mixed-layer CIN
-327 J/kg
Mixed-layer LCL
845 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 12, 2:10 PM CDTSevere Thunderstorm WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 16 more5 hr
Apr 12, 6:31 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Butler, Chambers, Clay, Coffee and 15 more59 min
Apr 12, 6:50 PM CDTSevere Thunderstorm WatchSPCBarbour, Bullock, Chambers, Clay, Coffee, Crenshaw and 12 more5 hr
Apr 12, 3:17 AM CDTMesoscale DiscussionSPCCharlotte, Collier, DeSoto, Hendry, Lee, Manatee and 1 more88 min
Apr 12, 4:15 AM CDTSevere Thunderstorm WatchSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more6 hr
Apr 12, 6:33 AM CDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more87 min
Apr 12, 5:43 PM CDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gulf, Holmes, Liberty and 4 more2 hr
Apr 12, 1:18 AM CDTMesoscale DiscussionSPCChatham, Effingham, Screven87 min
Apr 12, 12:52 PM CDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more113 min
Apr 12, 1:25 PM CDTTornado WatchSPCBaldwin, Bleckley, Burke, Columbia, Emanuel, Glascock and 19 more6 hr
Apr 12, 3:44 PM CDTMesoscale DiscussionSPCBaldwin, Bleckley, Burke, Columbia, Dodge, Emanuel and 19 more91 min

Nearby

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