Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 89

February 5, 2004Choctaw County, Marengo County, Sumter County, Alabama; 14 parishes in Louisiana; 17 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2004, 3:22 PM CST for Choctaw County, Marengo County, Sumter County, Alabama; 14 parishes in Louisiana; 17 counties in Mississippi. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Feb 5, 2004, 3:22 PM CST (21:22 UTC)
Expired: Feb 5, 2004, 5:15 PM CST
In force: 113 min
Issued by: the Storm Prediction Center

All 34 counties

Choctaw County, AL, Marengo County, AL, Sumter County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Livingston 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, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike 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.

Tornado Watch 7Feb 5, 4:55 PM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.4 hours before the alert went out and 80 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 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

Open this sounding in Storm Lab

The text

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

816 
ACUS11 KWNS 052123
SWOMCD
SPC MCD 052122 
ALZ000-MSZ000-LAZ000-052315-

MESOSCALE DISCUSSION 0089
NWS STORM PREDICTION CENTER NORMAN OK
0322 PM CST THU FEB 05 2004

AREAS AFFECTED...SERN LA...SRN MS...WRN AL

CONCERNING...TORNADO WATCH 6...

VALID 052122Z - 052315Z

SERIAL ECHOES/SUPERCELLS HAVE BEEN INCREASING FROM THE LA GULF COAST
INLAND TO IBERVILLE PARISH...THEN NEWD TO JEFFERSON DAVIS AND MARION
COUNTIES OF SCNTRL MS OVER THE PAST HALF HOUR. THIS ACTIVITY HAS
SHOWN A TENDENCY TO BECOME BETTER ORGANIZED INTO SHORT LINE SEGMENTS
 TRACKING NEWD AT 45-50KT. SURFACE OBS AND AREA RADARS APPEAR TO
SUGGEST THAT STORM UPDRAFTS MAY BE STRENGTHENING IMMEDIATELY WEST OF
THE SURFACE WIND SHIFT ASSOCIATED WITH THE INTENSE FRONTAL ZONE
MAKING SLOW EWD PROGRESS. PREFRONTAL/INFLOW AIRMASS REMAINS MODESTLY
UNSTABLE AND VERY MOIST WITH STRONG SHEAR...HELICITY...AND HIGH
BOUNDARY LAYER RH PERSISTING ACROSS THE WARM SECTOR. THUS...TORNADO
AND WIND DAMAGE THREAT SHOULD PERSIST ACROSS THE WATCH AREA THROUGH
THE LATE AFTERNOON.

..CARBIN.. 02/05/2004

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

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

29449185 29419258 30309147 31599011 32688845 32368723
30588913

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, 4:43 PM CST	Mesoscale Discussion	SPC	Autauga, Chilton, Choctaw, Clarke, Dallas, Greene and 6 more	32 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, 2004 Mesoscale Discussions in Louisiana, 2004 Mesoscale Discussions in Alabama, 2004 Every 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.