Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 2285

December 24, 2009Choctaw County, Mobile County, Washington County, Alabama; 6 parishes in Louisiana; 37 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 24, 2009, 1:14 PM CST for Choctaw County, Mobile County, Washington County, Alabama; 6 parishes in Louisiana; 37 counties in Mississippi. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Dec 24, 2009, 1:14 PM CST (19:14 UTC)
Expired
Dec 24, 2009, 2:15 PM CST
In force
61 min
Issued by
the Storm Prediction Center
All 46 counties

Choctaw County, AL, Mobile County, AL, Washington County, AL, Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Washington Parish, LA, Attala County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Holmes County, MS, Humphreys 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, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Washington County, MS, Wayne County, MS, Winston County, MS, Yazoo County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.2 hours before the alert went out and 74 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 2009-12-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 255 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 2009-12-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 395 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
255 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
395 m²/s²
0-3 km storm-relative helicity
501 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

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
Dec 24, 10:13 AM CSTMesoscale DiscussionSPCBaldwin, Mobile, Washington62 min
Dec 24, 10:37 AM CSTTornado WatchSPCBaldwin, Choctaw, Clarke, Mobile, Washington7 hr
Dec 24, 3:33 PM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Escambia, Mobile, Monroe and 1 more57 min
Dec 24, 4:46 PM CSTMesoscale DiscussionSPCBaldwin, Clarke, Conecuh, Covington, Escambia, Geneva and 3 more59 min
Dec 24, 5:37 PM CSTTornado WatchSPCBaldwin, Clarke, Coffee, Conecuh, Covington, Dale and 5 more9 hr
Dec 23, 7:50 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Red River and 2 more85 min
Dec 23, 8:48 PM CSTTornado WatchSPCBeauregard, Bienville, Bossier, Caddo, Calcasieu, Cameron and 7 more9 hr
Dec 23, 11:06 PM CSTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, Claiborne, De Soto and 5 more114 min
Dec 24, 3:30 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 42 more2 hr
Dec 24, 4:50 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more7 hr
Dec 24, 7:30 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Caldwell and 39 more90 min
Dec 24, 9:34 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more56 min

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Louisiana, 2009Mesoscale Discussions in Alabama, 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.