Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 494

April 14, 20075 states

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2007, 5:04 PM CDT for 5 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Apr 14, 2007, 5:04 PM CDT (22:04 UTC)
Expired
Apr 14, 2007, 6:00 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 46 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, Coffee 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, Pike County, AL, Sumter County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Troup County, GA, Plaquemines Parish, LA, Saint Bernard Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 53 km from the middle of the area, began a volume at 22:04 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.1 hours before the alert went out and 199 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, Slidell Radar S, LA at 12:00Z on 2007-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 800 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, Slidell Radar S, LA at 12:00Z on 2007-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 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
800 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
659 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.0

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 14, 10:07 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 7 more53 min
Apr 14, 10:26 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 32 more7 hr
Apr 14, 12:24 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 10 more66 min
Apr 14, 2:12 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 32 more63 min
Apr 14, 3:35 PM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston7 hr
Apr 14, 5:26 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Choctaw and 19 more6 hr
Apr 14, 2:40 PM CDTMesoscale DiscussionSPCBaker, Columbia, Franklin, Gadsden, Hamilton, Jefferson and 7 more65 min
Apr 14, 4:53 PM CDTMesoscale DiscussionSPCNassau97 min
Apr 13, 8:42 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 22 more2 hr
Apr 14, 1:34 AM CDTMesoscale DiscussionSPCAllen, Avoyelles, Caldwell, Catahoula, Concordia, East Carroll and 14 more56 min
Apr 14, 1:41 AM CDTTornado WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 19 more6 hr
Apr 14, 6:17 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafayette and 13 more88 min
Apr 14, 7:11 AM CDTSevere Thunderstorm WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more6 hr
Apr 13, 10:55 PM CDTMesoscale DiscussionSPCBolivar, Coahoma, Humphreys, Leflore, Quitman, Sunflower and 2 more95 min

Nearby

Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Florida, 2007Every mesoscale discussion in 2007

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.