Alert archive / Alabama / Mesoscale Discussions in 2009

Mesoscale Discussion 313

March 28, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2009, 4:25 AM CDT for 5 states. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued
Mar 28, 2009, 4:25 AM CDT (09:25 UTC)
Expired
Mar 28, 2009, 5:00 AM CDT
In force
35 min
Issued by
the Storm Prediction Center
All 115 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Fayette County, AL, Geneva County, AL, Greene County, AL, Hale County, AL, Henry County, AL, Houston County, AL, Jefferson County, AL, Lamar 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, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell 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, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Worth County, GA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Eglin Afb radar (KEVX), 63 km from the middle of the area, began a volume at 09:25 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 9.4 hours before the alert went out and 196 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 00:00Z on 2009-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Tallahassee Rgnl, FL at 00:00Z on 2009-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1088 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
264 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
Mar 27, 8:21 PM CDTMesoscale DiscussionSPCBaldwin, Escambia, Mobile, Washington84 min
Mar 27, 10:09 PM CDTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more9 hr
Mar 27, 11:51 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more84 min
Mar 28, 1:17 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston4 hr
Mar 28, 3:14 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more61 min
Mar 28, 4:50 AM CDTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 11 more5 hr
Mar 28, 4:59 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Calhoun, Chambers and 24 more3 hr
Mar 28, 6:48 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Coffee, Conecuh, Covington, Crenshaw and 6 more57 min
Mar 28, 9:20 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston8 hr
Mar 28, 12:58 PM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Jackson, Lauderdale, Lawrence and 5 more92 min
Mar 28, 2:23 PM CDTTornado WatchSPCCullman, DeKalb, Jackson, Lauderdale, Lawrence, Limestone and 3 more7 hr
Mar 28, 5:18 PM CDTMesoscale DiscussionSPCDeKalb, Jackson, Limestone, Madison, Marshall, Morgan57 min
Mar 28, 2:19 PM CDTMesoscale DiscussionSPCCalhoun, Franklin, Gadsden, Gulf, Hamilton, Jefferson and 5 more56 min
Mar 28, 10:51 AM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Bryan, Bulloch, Burke and 21 more54 min
Mar 28, 11:47 AM CDTTornado WatchSPCAppling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 22 more7 hr
Mar 27, 7:51 PM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 36 more9 hr
Mar 27, 10:24 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, East Carroll and 13 more96 min
Mar 27, 11:06 PM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Caldwell and 32 more84 min
Mar 28, 1:33 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 14 more27 min
Mar 28, 2:20 AM CDTTornado WatchSPCClarke, Covington, Forrest, Jasper, Jefferson Davis, Jones and 10 more3 hr

Nearby

Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Florida, 2009Every mesoscale discussion in 2009

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.