Alert archive / Mississippi / Mesoscale Discussions in 2004
Mesoscale Discussion 2452
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 9:00 PM CST | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, DeKalb, Etowah, Franklin and 10 more | 2 hr |
| Nov 23, 9:20 PM CST | Tornado Watch | SPC | Blount, Colbert, Cullman, Etowah, Fayette, Franklin and 13 more | 7 hr |
| Nov 23, 11:16 PM CST | Mesoscale Discussion | SPC | Bibb, Blount, Chilton, Choctaw, Clarke, Cullman and 14 more | 119 min |
| Nov 24, 12:45 AM CST | Tornado Watch | SPC | Bibb, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more | 5 hr |
| Nov 24, 2:43 AM CST | Mesoscale Discussion | SPC | Choctaw, Clarke, Greene, Hale, Marengo, Pickens and 3 more | 62 min |
| Nov 24, 3:35 AM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 11 more | 25 min |
| Nov 24, 3:55 AM CST | Tornado Watch | SPC | Blount, Calhoun, Cherokee, Cleburne, Cullman, Etowah and 5 more | 5 hr |
| Nov 24, 4:57 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Chilton, Choctaw, Clarke, Conecuh and 13 more | 63 min |
| Nov 24, 5:20 AM CST | Tornado Watch | SPC | Autauga, Baldwin, Bibb, Butler, Chambers, Chilton and 20 more | 6 hr |
| Nov 24, 7:11 AM CST | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Calhoun, Chambers and 24 more | 64 min |
| Nov 24, 7:25 AM CST | Tornado Watch | SPC | Barbour, Chambers, Lee, Russell | 6 hr |
| Nov 24, 8:03 AM CST | Mesoscale Discussion | SPC | Barbour, Coffee, Covington, Dale, Geneva, Henry and 2 more | 57 min |
| Nov 24, 8:30 AM CST | Tornado Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 6 hr |
| Nov 24, 9:23 AM CST | Mesoscale Discussion | SPC | Barbour, Chambers, Lee, Russell | 97 min |
| Nov 24, 11:24 AM CST | Mesoscale Discussion | SPC | Coffee, Dale, Geneva, Henry, Houston | 2 hr |
| Nov 23, 7:50 PM CST | Tornado Watch | SPC | Sabine | 6 hr |
| Nov 23, 7:53 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more | 37 min |
| Nov 23, 8:15 PM CST | Tornado Watch | SPC | Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more | 6 hr |
| Nov 23, 9:14 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more | 2 hr |
| Nov 23, 10:01 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more | 119 min |
| Nov 23, 11:00 PM CST | Severe Thunderstorm Watch | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 15 more | 7 hr |
| Nov 24, 1:28 AM CST | Mesoscale Discussion | SPC | Avoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Evangeline and 9 more | 32 min |
| Nov 24, 1:45 AM CST | Tornado Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more | 4 hr |
| Nov 24, 2:50 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more | 3 hr |
| Nov 24, 5:35 AM CST | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard | 25 min |
| Nov 24, 5:55 AM CST | Tornado Watch | SPC | Plaquemines, Saint Bernard | 2 hr |
| Nov 23, 6:35 PM CST | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more | 7 hr |
| Nov 24, 10:16 AM CST | Mesoscale Discussion | SPC | Alcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more | 2 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.