Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 463
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 4:36 PM CDT for Harmon County, Jackson County, Tillman County, Oklahoma; 36 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2003, 4:36 PM CDT (21:36 UTC)
- Expired
- Apr 15, 2003, 6:00 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 39 counties
Harmon County, OK, Jackson County, OK, Tillman County, OK, Baylor County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Coke County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Reagan County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wilbarger County, TX
The radar
The Lubbock radar (KLBB), 111 km from the middle of the area, began a volume at 21:35 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Midland Regional, TX (KMAF), launched 12:00Z, 9.6 hours before the alert went out and 156 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
- 10 J/kg
- Mixed-layer CIN
- -249 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
425 ACUS11 KWNS 152137 SWOMCD SPC MCD 152136 OKZ000-TXZ000-152300- MESOSCALE DISCUSSION 0463 NWS STORM PREDICTION CENTER NORMAN OK 0436 PM CDT TUE APR 15 2003 AREAS AFFECTED...NWRN TX...TX SOUTH PLAINS...SWRN OK CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 152136Z - 152300Z ...TORNADO WATCH WILL BE ISSUED SOON FOR PORTIONS OF NWRN TX AND SWRN OK... INTENSE UPPER SPEED MAX IS EJECTING NEWD ACROSS SRN NM TOWARD THE TX SOUTH PLAINS. THIS FEATURE IS SUPPORTED BY MOST RECENT SFC OBS ACROSS SRN NM AND WEST TX WHERE GUSTS ARE IN EXCESS OF 50KT FROM NEAR ROW SWD TO NEAR GDP. SRN PORTION OF STRONGEST HEIGHT FALLS WILL UNDOUBTLY FORCE CONVECTION SOON FROM NORTHEAST OF MAF...NEWD INTO SWRN OK. TORNADOES ARE POSSIBLE ESPECIALLY ACROSS NWRN TX INTO SWRN OK...OTHERWISE LARGE HAIL AND DEVELOPING BOW ECHOES WILL BE THE SEVERE THREATS. ..DARROW.. 04/15/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OUN...SJT...LUB...AMA...MAF... 31900214 33540196 34930146 34639839 32419958 31140132
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 12:41 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Ellis, Greer, Harmon, Harper and 2 more | 3 hr |
| Apr 15, 2:10 PM CDT | Tornado Watch | SPC | Beaver, Beckham, Dewey, Ellis, Harper, Roger Mills and 2 more | 5 hr |
| Apr 15, 3:32 PM CDT | Mesoscale Discussion | SPC | Custer, Dewey, Harper, Washita, Woods, Woodward | 118 min |
| Apr 15, 5:00 PM CDT | Tornado Watch | SPC | Comanche, Greer, Harmon, Jackson, Kiowa, Tillman | 6 hr |
| Apr 15, 5:55 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 11 more | 65 min |
| Apr 15, 6:30 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 13 more | 5 hr |
| Apr 15, 12:12 PM CDT | Mesoscale Discussion | SPC | Bailey, Castro, Cochran, Deaf Smith, Gaines, Hale and 9 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Oklahoma, 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.