Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 720

April 30, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2005, 4:42 AM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2005, 4:42 AM CDT (09:42 UTC)
Expired
Apr 30, 2005, 6:15 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 121 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Crenshaw County, AL, Cullman County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Marion County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Winston County, AL, Butts County, GA, Carroll County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Meriwether County, GA, Paulding County, GA, Pike County, GA, Polk County, GA, Rockdale County, GA, Spalding County, GA, Troup County, GA, East Feliciana Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS, Winston County, MS

The radar

The Mobile radar (KMOB), 123 km from the middle of the area, began a volume at 09:43 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, 9.7 hours before the alert went out and 189 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 2005-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 84 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, Birmingham, AL at 00:00Z on 2005-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 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
84 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
1501 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
370 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 29, 8:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 26 more97 min
Apr 29, 9:45 PM CDTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more7 hr
Apr 30, 1:39 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more96 min
Apr 30, 2:40 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Choctaw, Cullman and 16 more7 hr
Apr 30, 5:05 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 25 more7 hr
Apr 30, 6:41 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 29 more94 min
Apr 30, 7:10 AM CDTSevere Thunderstorm WatchSPCDale, Geneva, Henry, Houston6 hr
Apr 30, 11:02 AM CDTMesoscale DiscussionSPCBaldwin, Covington, Escambia, Mobile58 min
Apr 30, 8:40 AM CDTSevere Thunderstorm WatchSPCColumbia, Lincoln, Richmond6 hr
Apr 30, 11:48 AM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Brantley, Brooks, Bryan and 19 more27 min
Apr 30, 12:05 PM CDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 32 more5 hr
Apr 29, 10:55 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more2 hr
Apr 30, 1:08 AM CDTMesoscale DiscussionSPCAvoyelles, Concordia, East Baton Rouge, East Feliciana, Iberville, Livingston and 8 more2 hr
Apr 29, 9:23 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall97 min
Apr 30, 2:25 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall95 min

Nearby

Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Georgia, 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.