Alert archive / Louisiana / Mesoscale Discussions in 2004
Mesoscale Discussion 83
The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2004, 7:35 AM CST for 17 parishes in Louisiana; 12 counties in Mississippi. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Feb 5, 2004, 7:35 AM CST (13:35 UTC)
- Expired
- Feb 5, 2004, 9:30 AM CST
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 29 counties
Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Pike County, MS, Simpson County, MS, Wilkinson 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.6 hours before the alert went out and 155 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
- 1499 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 7.0
The text
As transmitted, in the capitals the NWS used until 2016.
289 ACUS11 KWNS 051336 SWOMCD SPC MCD 051335 MSZ000-LAZ000-TXZ000-051530- MESOSCALE DISCUSSION 0083 NWS STORM PREDICTION CENTER NORMAN OK 0735 AM CST THU FEB 05 2004 AREAS AFFECTED...SRN/CNTRL LA...SW MS CONCERNING...TORNADO WATCH 5... VALID 051335Z - 051530Z SEVERE THREAT WILL INCREASE NEXT FEW HOURS...WITH POTENTIAL FOR ISOLATED TORNADOES AND DAMAGING WINDS...IN ADDITION TO HAIL. CONTINUE REMAINING VALID PORTION OF WW. MID/UPPER 60S SURFACE DEW POINTS HAVE ADVECTED ACROSS SOUTH CENTRAL/ SOUTHEASTERN LOUISIANA INTO SOUTHWESTERN MISSISSIPPI...AHEAD OF PRE-FRONTAL CONVECTIVE LINE. SHALLOW SURFACE INVERSION EVIDENT IN 12Z SOUNDINGS WILL BE MODIFIED WITHIN THE NEXT COUPLE OF HOURS AS MORE RAPID SURFACE HEATING COMMENCES. SEVERAL INTENSE CELLS ARE ALREADY EMBEDDED WITHIN DEVELOPING LINE...AND DESTABILIZATION OF BOUNDARY LAYER WILL SUPPORT FURTHER INTENSIFICATION. THIS WILL BE ACCOMPANIED BY INCREASING RISK FOR TORNADOES...NEAR/WEST THROUGH NORTH OF LAFAYETTE LA AFTER 15Z. INTENSE CELLS WILL CONTINUE TO DEVELOP NORTHEASTWARD INTO VICINITY OF COLD FRONT NOW ADVANCING EAST OF THE MISSISSIPPI RIVER INTO PARTS OF WEST CENTRAL/SOUTHWEST MISSISSIPPI. MEANWHILE...REDEVELOPMENT OF STRONG/SEVERE THUNDERSTORMS WILL CONTINUE ACROSS SOUTH CENTRAL LOUISIANA THROUGH MIDDAY...AS STRONGEST UPPER DIFLUENCE BETWEEN POLAR/SUBTROPICAL JETS BECOMES FOCUSED ACROSS THE CENTRAL GULF COAST AREA BY 18Z. ..KERR.. 02/05/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...JAN...LIX...LCH...HGX... 29529447 30109381 30469290 30899214 31399153 31889115 32289063 32399009 31728981 31239011 30519079 29809137 29549178
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 8:02 AM CST | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, East Baton Rouge, East Feliciana, Evangeline and 11 more | 118 min |
| Feb 5, 9:52 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 11 more | 113 min |
| Feb 5, 11:35 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 16 more | 5 hr |
| Feb 5, 1:11 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Lafourche, Livingston, Orleans, Saint Charles and 5 more | 2 hr |
| Feb 5, 3:22 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Livingston and 8 more | 113 min |
| Feb 5, 4:43 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 15 more | 32 min |
| Feb 5, 4:55 PM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Lafourche and 13 more | 6 hr |
Nearby
Mesoscale Discussions in Louisiana, 2004Mesoscale Discussions in Mississippi, 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.