Alert archive / Louisiana / Mesoscale Discussions in 2004

Mesoscale Discussion 79

February 4, 200416 parishes in Louisiana; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 4, 2004, 11:37 PM CST for 16 parishes in Louisiana; 9 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Feb 4, 2004, 11:37 PM CST (05:37 UTC)
Expired: Feb 5, 2004, 1:00 AM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 25 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Hardin County, TX, Jasper County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 5.6 hours before the alert went out and 52 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 517 m²/s²
0-3 km storm-relative helicity: 572 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

311 
ACUS11 KWNS 050537
SWOMCD
SPC MCD 050537 
LAZ000-MSZ000-TXZ000-050700-

MESOSCALE DISCUSSION 0079
NWS STORM PREDICTION CENTER NORMAN OK
1137 PM CST WED FEB 04 2004

AREAS AFFECTED...UPPER TX COAST AND SRN LA

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 050537Z - 050700Z

A TORNADO WATCH MAY BE REQUIRED FOR PORTIONS OF THE AREA IN THE NEXT
COUPLE OF HOURS.

CONVECTION IS INCREASING ACROSS THE UPPER TX COAST AND SWRN
LA...PROBABLY IN RESPONSE TO THE APPROACH OF LARGER SCALE FORCING
MOVING INTO CNTRL TX ATTM.  WARM FRONT HAS MOVED NORTH ONTO THE
UPPER TX COAST AND INTO SRN LA...ROUGHLY FROM SOUTH OF
KMSY-KLCH-KIAH.  AS THE FORCING SPREADS NEWD...SRN PERIPHERY IS
EXPECTED TO GLANCE THE AREA OVERNIGHT AND AN INCREASE IN CONVECTION
IS EXPECTED.  

VWP FROM KHGX SHOWS VEERING THROUGH THE COLUMN...BUT KLCH AND KPOE
PROFILES SHOW MORE SUBSTANTIAL LOW LEVEL TURNING.  WHILE A HAIL
THREAT WILL CONTINUE NORTH OF THE FRONT...AN INCREASING RISK OF
TORNADOES IS EXPECTED THE NEXT FEW HOURS ROUGHLY FROM N OF THE HOU
METRO AREA INTO PARTS OF SRN/CNTRL LA.

..RACY.. 02/05/2004

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

ATTN...WFO...JAN...LIX...LCH...SHV...HGX...

30059557 31379433 31579242 31129139 29889117 29939314

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
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
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
Feb 4, 8:09 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Brazoria, Brazos, Burleson and 29 more	96 min
Feb 4, 9:20 PM CST	Severe Thunderstorm Watch	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 52 more	6 hr
Feb 4, 11:49 PM CST	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 53 more	86 min

Nearby

Mesoscale Discussions in Louisiana, 2004 Mesoscale Discussions in Texas, 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.