Alert archive / Mississippi / Mesoscale Discussions in 2004
Mesoscale Discussion 92
The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2004, 4:43 PM CST for 12 counties in Alabama; 21 parishes in Louisiana; 28 counties in Mississippi. It was in force for 32 min.
The area
The outline as issued.
The facts
- Issued
- Feb 5, 2004, 4:43 PM CST (22:43 UTC)
- Expired
- Feb 5, 2004, 5:15 PM CST
- In force
- 32 min
- Issued by
- the Storm Prediction Center
All 61 counties
Autauga County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Marengo County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
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, 10.7 hours before the alert went out and 71 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
- 772 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 446 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 338 m²/s²
- 0-3 km storm-relative helicity
- 542 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
538 ACUS11 KWNS 052243 SWOMCD SPC MCD 052243 ALZ000-MSZ000-LAZ000-052315- MESOSCALE DISCUSSION 0092 NWS STORM PREDICTION CENTER NORMAN OK 0443 PM CST THU FEB 05 2004 AREAS AFFECTED...LOWER MS VLY CONCERNING...TORNADO WATCH 6... VALID 052243Z - 052315Z SURFACE FRONT HAS BECOME STATIONARY ACROSS CNTRL AL SWWD INTO SRN MS AND SCNTRL LA. BAND OF TSTMS CONTINUES ALONG/NORTH OF THE FRONT. SEVERAL CELLS WITHIN THE BAND HAVE TAKEN ON SMALL SCALE BOWS/LEWPS GIVEN THE UNIDIRECTIONAL SSWLY FLOW THROUGH THE COLUMN. THESE TSTMS MAY POSE A DAMAGING WIND OR BRIEF TORNADO THREATS. THERE ARE A COUPLE OF NEGATIVES FOR WIDESPREAD SEVERE WEATHER. WATER VAPOR IMAGERY SHOWS SOME INCREASE IN UPPER LEVEL RIDGING NOTED BY ANTICYCLONIC ARCING MID/HIGH LEVEL CLOUDS OVER THE WRN GULF BASIN AHEAD OF NEXT IMPULSE READY TO EJECT NEWD FROM S TX. MOREOVER...MIDLEVEL TEMPERATURES ARE SOMEWHAT HIGH TO SUPPORT VIGOROUS UPDRAFTS. NONETHELESS...LOW LEVEL FLOW IS QUITE STRONG AND IS RICH WITH LOW LEVEL HELICITY. THIS MAY COMPENSATE FOR THE MODEST BUOYANCY AND SOMEWHAT UNFAVORABLE UPPER LEVEL RIDGING. AS SUCH...A NEW TORNADO WATCH WILL BE ISSUED FOR PARTS OF THE AREA BY 23 UTC. THE SEVERE THREAT MAY ACTUALLY BE HIGHER LATER THIS EVENING WHEN THE NEXT IMPULSE APPROACHES THE LOWER MS VLY. ..RACY.. 02/05/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BMX...MOB...JAN...LIX...LCH... 29299271 32918923 32918622 29259007
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 5, 9:52 AM CST | Mesoscale Discussion | SPC | Choctaw, Washington | 113 min |
| Feb 5, 11:35 AM CST | Tornado Watch | SPC | Autauga, Chilton, Choctaw, Clarke, Dallas, Greene and 6 more | 5 hr |
| Feb 5, 1:11 PM CST | Mesoscale Discussion | SPC | Choctaw, Clarke, Greene, Hale, Marengo, Perry and 2 more | 2 hr |
| Feb 5, 3:22 PM CST | Mesoscale Discussion | SPC | Choctaw, Marengo, Sumter | 113 min |
| Feb 5, 4:55 PM CST | Tornado Watch | SPC | Bibb, Chilton, Choctaw, Clarke, Dallas, Greene and 10 more | 6 hr |
| Feb 4, 11:37 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Evangeline and 10 more | 83 min |
| Feb 5, 1:16 AM CST | Mesoscale Discussion | SPC | Beauregard, Bienville, De Soto, Grant, Jackson, Lincoln and 6 more | 119 min |
| Feb 5, 5:08 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 27 more | 3 hr |
| Feb 5, 5:40 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 33 more | 6 hr |
| Feb 5, 7:35 AM CST | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, East Baton Rouge, East Feliciana, Evangeline and 11 more | 115 min |
| Feb 5, 8:02 AM CST | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, East Baton Rouge, East Feliciana, Evangeline and 11 more | 118 min |
Nearby
Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Louisiana, 2004Mesoscale Discussions in Alabama, 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.