Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 149

February 23, 2003Sabine Parish, Louisiana; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2003, 5:25 PM CST for Sabine Parish, Louisiana; 12 counties in Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Feb 23, 2003, 5:25 PM CST (23:25 UTC)
Expired
Feb 23, 2003, 7:00 PM CST
In force
95 min
Issued by
the Storm Prediction Center

Counties Sabine Parish, LA, Angelina County, TX, Austin County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Tyler County, TX, Waller County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.4 hours before the alert went out and 182 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2003-02-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2003-02-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1711 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
148 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.

300 
ACUS11 KWNS 232325
SWOMCD
SPC MCD 232325 
TXZ000-LAZ000-240100-

MESOSCALE DISCUSSION 0149
NWS STORM PREDICTION CENTER NORMAN OK
0525 PM CST SUN FEB 23 2003

AREAS AFFECTED...SERN TX AND WEST CENTRAL LA 

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 232325Z - 240100Z

...STORMS WITH MARGINALLY SEVERE HAIL ARE POSSIBLE FOR THE NEXT
COUPLE OF HOURS...HOWEVER...COVERAGE SHOULD BE TOO ISOLATED FOR A
WW.



CONVECTION HAS DEVELOPED ALONG AN AREA OF CONVERGENCE FROM 40 WNW
VCT TO 40 NW POE.  THESE STORMS MAY BRIEFLY INCREASE DURING THE
NEXT HOUR OR SO AS COLD FRONT FROM NEAR SHV TO SAT INTERSECTS
BOUNDARY FROM SOUTH OF CLL TO NEAR LFK.  ALTHOUGH  RUC FORECAST
SOUNDINGS SHOW RELATIVELY WARM MID LEVEL TEMPERATURES...SURFACE
TEMPERATURES IN THE LOW TO MID 70S AND DEWPOINTS IN THE MID 50S
ARE RESULTING IN MUCAPES FROM 500 TO 1000 J/KG. ISOLATED STORMS
WITH MARGINAL SEVERE HAIL ARE POSSIBLE THE NEXT COUPLE OF
HOURS...BUT STORMS ARE EXPECTED TO REMAIN TOO ISOLATED FOR A WW.



..IMY.. 02/23/2003

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

29469640 29939674 30849531 31349455 31659367 31489305
30689379 30249459 29959528 29639591

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 23, 2:14 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 5 more2 hr

Nearby

Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Louisiana, 2003Every mesoscale discussion in 2003

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.