Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2452

November 24, 200418 counties in Alabama; Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana; 23 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 24, 2004, 12:30 AM CST for 18 counties in Alabama; Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana; 23 counties in Mississippi. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
Nov 24, 2004, 12:30 AM CST (06:30 UTC)
Expired
Nov 24, 2004, 1:00 AM CST
In force
30 min
Issued by
the Storm Prediction Center
All 44 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Coosa County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest 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, Marion County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 84 km from the middle of the area, began a volume at 06:31 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 00:00Z, 6.5 hours before the alert went out and 151 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 00:00Z on 2004-11-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 866 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 00:00Z on 2004-11-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
866 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
805 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

458 
ACUS11 KWNS 240630
SWOMCD
SPC MCD 240630 
ALZ000-FLZ000-MSZ000-LAZ000-240700-

MESOSCALE DISCUSSION 2452
NWS STORM PREDICTION CENTER NORMAN OK
1230 AM CST WED NOV 24 2004

AREAS AFFECTED...SERN MS INTO PORTIONS OF WRN/SWRN AL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 240630Z - 240700Z

TORNADO WATCH WILL BE ISSUED SOON FOR SERN MS INTO PORTIONS OF
SWRN/WRN AL.

REGIONAL RADARS SHOW A POTENTIALLY TORNADIC SUPERCELL OVER SERN LA
/ST TAMMANY PARISH/ MOVING NORTHEAST AROUND 30 KT.  STRONG SLY LLJ
(40 KT) OVER SERN LA INTO MS WILL CONTINUE TO STRENGTHEN OVERNIGHT
AS STRONG UPSTREAM UPPER TROUGH MOVES TOWARD LOWER MS VALLEY.  THIS
WILL RESULT IN FURTHER BOUNDARY LAYER MOISTENING/DESTABILIZATION FOR
ADDITIONAL DISCRETE SUPERCELLS IN ADVANCE OF THE FAST MOVING SQUALL
LINE...WHICH WAS LOCATED ACROSS NRN TO SWRN LA AT 0630Z.  0-1 KM SRH
VALUES ARE VERY STRONG /AROUND 300 M2/S2/ AND SUPPORTIVE OF
TORNADOES.

..PETERS.. 11/24/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...BMX...MOB...JAN...LIX...

30469086 33168860 33238593 30328776 30248832

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 23, 9:00 PM CSTMesoscale DiscussionSPCBlount, Colbert, Cullman, DeKalb, Etowah, Franklin and 10 more2 hr
Nov 23, 9:20 PM CSTTornado WatchSPCBlount, Colbert, Cullman, Etowah, Fayette, Franklin and 13 more7 hr
Nov 23, 11:16 PM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Clarke, Cullman and 14 more119 min
Nov 24, 12:45 AM CSTTornado WatchSPCBibb, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more5 hr
Nov 24, 2:43 AM CSTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Pickens and 3 more62 min
Nov 24, 3:35 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 11 more25 min
Nov 24, 3:55 AM CSTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, Etowah and 5 more5 hr
Nov 24, 4:57 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Chilton, Choctaw, Clarke, Conecuh and 13 more63 min
Nov 24, 5:20 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Butler, Chambers, Chilton and 20 more6 hr
Nov 24, 7:11 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Calhoun, Chambers and 24 more64 min
Nov 24, 7:25 AM CSTTornado WatchSPCBarbour, Chambers, Lee, Russell6 hr
Nov 24, 8:03 AM CSTMesoscale DiscussionSPCBarbour, Coffee, Covington, Dale, Geneva, Henry and 2 more57 min
Nov 24, 8:30 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Nov 24, 9:23 AM CSTMesoscale DiscussionSPCBarbour, Chambers, Lee, Russell97 min
Nov 24, 11:24 AM CSTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston2 hr
Nov 23, 7:50 PM CSTTornado WatchSPCSabine6 hr
Nov 23, 7:53 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more37 min
Nov 23, 8:15 PM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more6 hr
Nov 23, 9:14 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more2 hr
Nov 23, 10:01 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more119 min
Nov 23, 11:00 PM CSTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 15 more7 hr
Nov 24, 1:28 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Evangeline and 9 more32 min
Nov 24, 1:45 AM CSTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more4 hr
Nov 24, 2:50 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more3 hr
Nov 24, 5:35 AM CSTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard25 min
Nov 24, 5:55 AM CSTTornado WatchSPCPlaquemines, Saint Bernard2 hr
Nov 23, 6:35 PM CSTTornado WatchSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more7 hr
Nov 24, 10:16 AM CSTMesoscale DiscussionSPCAlcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Alabama, 2004Mesoscale Discussions in Louisiana, 2004Every mesoscale discussion in 2004

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.