Alert archive / Alabama / Mesoscale Discussions in 2006

Mesoscale Discussion 573

April 19, 200626 counties in Alabama; Jackson County, Florida; 14 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2006, 7:51 PM CDT for 26 counties in Alabama; Jackson County, Florida; 14 counties in Georgia. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 19, 2006, 7:51 PM CDT (00:51 UTC)
Expired
Apr 19, 2006, 9:15 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 41 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Chilton County, AL, Coffee County, AL, Coosa County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Hale County, AL, Henry County, AL, Houston County, AL, Jefferson County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Russell County, AL, Shelby County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Jackson County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart County, GA, Terrell County, GA

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.9 hours before the alert went out and 149 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, Birmingham, AL at 00:00Z on 2006-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1818 joules per kilogram.LCLEL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2006-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
1818 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1479 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.5

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 20, 11:19 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 24 more86 min
Apr 20, 11:38 AM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 20 more7 hr
Apr 20, 1:38 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Colbert and 22 more2 hr
Apr 20, 3:40 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 25 more2 hr
Apr 20, 3:55 PM CDTSevere Thunderstorm WatchSPCChambers, Clay, Cleburne, Coosa, Randolph, Tallapoosa6 hr
Apr 20, 6:11 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 19 more2 hr
Apr 20, 6:57 PM CDTSevere Thunderstorm WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 22 more5 hr
Apr 20, 1:53 PM CDTMesoscale DiscussionSPCBanks, Dawson, Fannin, Forsyth, Franklin, Gilmer and 9 more2 hr

Nearby

Mesoscale Discussions in Alabama, 2006Mesoscale Discussions in Georgia, 2006Mesoscale Discussions in Florida, 2006Every mesoscale discussion in 2006

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.