Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 154
The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2003, 6:48 PM CST for 15 counties in Arkansas; 37 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 24, 2003, 6:48 PM CST (00:48 UTC)
- Expired
- Feb 25, 2003, 1:15 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 52 counties
Calhoun County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 112 km from the middle of the area, began a volume at 00:48 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 0.8 hours before the alert went out and 119 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 811 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 300 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
486 ACUS11 KWNS 250049 SWOMCD SPC MCD 250048 TXZ000-OKZ000-ARZ000-250715- MESOSCALE DISCUSSION 0154 NWS STORM PREDICTION CENTER NORMAN OK 0648 PM CST MON FEB 24 2003 AREAS AFFECTED...NERN TX...EXTREME SERN OK...SWRN AND S CENTRAL AR CONCERNING...WINTER MIXED PRECIPITATION VALID 250048Z - 250715Z MDT TO HVY SLEET IS EXPECTED MAINLY WITHIN A TRIANGLE FROM TYR TO DAL TO PBF. A MIXTURE OF SLEET AND SNOW IS EXPECTED NORTH OF THIS AREA ALONG THE RED RIVER EWD TO NEAR LIT. PRECIPITATION WILL CONTINUE TO INCREASE IN COVERAGE AND INTENSITY OVER NERN KS AND SPREAD INTO SRN AR LATER THIS EVENING. LOW LEVEL THETA-E ADVECTION AND INCREASING FRONTOGENETICAL LIFT WILL INCREASE AVAILABLE MOISTURE FOR HOURLY RATES...BUT WILL ALLOW FOR AN INCREASING WARM NOSE ABOVE A COLD BOUNDARY LAYER. THEREFORE ICE PELLETS / SLEET IS EXPECTED OVER MOST OF THE DISCUSSION AREA. SNOW WILL BE MOST LIKELY OVER SERN OK AND W-CENTRAL AR WHERE ENTIRE THERMODYNAMIC PROFILE IS FORECAST TO BE BELOW FREEZING. PRECIPITATION RATES WILL ALSO BE ENHANCED PERIODICALLY BY EMBEDDED CONVECTIVE ELEMENTS GIVEN PRESENCE OF MARGINAL INSTABILITY. ..JEWELL.. 02/25/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... 31619718 32839751 33759657 34299380 34489238 34169188 33709207 33379302 32969418 32009502 30769642 31379712
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 8:55 PM CST | Mesoscale Discussion | SPC | Arkansas, Cleveland, Craighead, Crittenden, Cross, Faulkner and 18 more | 5 hr |
| Feb 25, 2:20 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 23 more | 4 hr |
| Feb 25, 3:09 AM CST | Mesoscale Discussion | SPC | Austin, Brazos, Burleson, Chambers, Colorado, Fayette and 15 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Arkansas, 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; radar from the NEXRAD Level II archive.