Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 665

April 22, 200536 counties in Alabama; Escambia County, Santa Rosa County, Florida; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 8:28 PM CDT for 36 counties in Alabama; Escambia County, Santa Rosa County, Florida; 10 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 8:28 PM CDT (01:28 UTC)
Expired
Apr 22, 2005, 10:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 48 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Greene County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jones County, MS, Lauderdale County, MS, Newton County, MS, Perry County, MS, Wayne County, MS

The radar

The Birmingham radar (KBMX), 146 km from the middle of the area, began a volume at 01:27 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 watches that followed

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.5 hours before the alert went out and 147 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 2005-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1705 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 2005-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.19395878Sfc1 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
1705 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1219 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
223 m²/s²
Significant tornado parameter
1.7
Supercell composite
18.6

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 22, 8:50 PM CDTSevere Thunderstorm WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 27 more5 hr
Apr 22, 10:01 PM CDTMesoscale DiscussionSPCDale, Geneva, Henry, Houston89 min
Apr 22, 11:14 PM CDTMesoscale DiscussionSPCAutauga, Bullock, Butler, Chambers, Clarke, Conecuh and 14 more91 min
Apr 22, 9:15 PM CDTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Duval, Hamilton and 5 more60 min
Apr 22, 10:58 PM CDTMesoscale DiscussionSPCBaker, Calhoun, Columbia, Franklin, Gadsden, Gilchrist and 9 more32 min
Apr 22, 11:15 PM CDTSevere Thunderstorm WatchSPCCalhoun, Columbia, Gadsden, Gilchrist, Gulf, Hamilton and 9 more4 hr
Apr 23, 2:28 AM CDTMesoscale DiscussionSPCAlachua, Bay, Bradford, Calhoun, Dixie, Flagler and 18 more92 min
Apr 22, 10:29 PM CDTMesoscale DiscussionSPCAdams, Amite, Copiah, Covington, Forrest, Franklin and 10 more91 min
Apr 22, 11:20 PM CDTMesoscale DiscussionSPCPearl River55 min

Nearby

Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Florida, 2005Every mesoscale discussion in 2005

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.