Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 415
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 4:09 PM MDT for 4 states. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2004, 4:09 PM MDT (22:09 UTC)
- Expired
- Apr 21, 2004, 5:15 PM MDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 23 counties
Baca County, CO, Bent County, CO, Prowers County, CO, Grant County, KS, Hamilton County, KS, Haskell County, KS, Meade County, KS, Morton County, KS, Seward County, KS, Stanton County, KS, Stevens County, KS, Beaver County, OK, Cimarron County, OK, Texas County, OK, Dallam County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX
The nearest sounding before it
Dodge City, (KDDC), launched 12:00Z, 10.2 hours before the alert went out and 200 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
- 2357 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
412 ACUS11 KWNS 212209 SWOMCD SPC MCD 212209 KSZ000-TXZ000-OKZ000-COZ000-NMZ000-212315- MESOSCALE DISCUSSION 0415 NWS STORM PREDICTION CENTER NORMAN OK 0509 PM CDT WED APR 21 2004 AREAS AFFECTED...SERN CO...SWRN KS...OK AND TX PANHANDLES CONCERNING...SEVERE THUNDERSTORM WATCH 100... VALID 212209Z - 212315Z THREAT FOR LARGE HAIL AND WIND DAMAGE IS EXPECTED TO INCREASE DURING THE NEXT HOUR OR SO...ESPECIALLY AS THE STORMS DEVELOP/MOVE SEWD INTO THE OK AND TX PANHANDLES. A BOUNDARY EXTENDS FROM SERN CO SEWD INTO THE TX PANHANDLE NORTH OF AMA/DHT. SOUTH OF THE BOUNDARY WINDS ARE SWLY AND DEWPOINTS ARE IN THE 20S/LOWER 30S. NORTH OF THIS BOUNDARY 15-25 MPH ELY WINDS AREA ADVECTING MID AND UPPER 40 DEWPOINTS...RESULTING IN SBCAPES AROUND 1000 J/KG. STRONGEST CONVERGENCE IS LOCATED IN THE OK AND NRN TX PANHANDLES...AND STORMS ARE LIKELY TO INTENSIFY WITH SEVERE HAIL THE MAIN THREAT. ..IMY.. 04/21/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DDC...AMA...PUB...BOU...ABQ... 38530347 37890143 37390006 35310004 36140256 36640330
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 2:00 PM MDT | Severe Thunderstorm Watch | SPC | Baca, Bent, Kiowa, Prowers | 6 hr |
| Apr 20, 6:22 PM MDT | Mesoscale Discussion | SPC | Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more | 23 min |
| Apr 21, 12:56 PM MDT | Mesoscale Discussion | SPC | Grant, Meade, Morton, Seward, Stanton, Stevens | 94 min |
| Apr 20, 6:50 PM MDT | Tornado Watch | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 5 hr |
| Apr 20, 7:57 PM MDT | Mesoscale Discussion | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 2 hr |
| Apr 20, 9:39 PM MDT | Mesoscale Discussion | SPC | Haskell, Hughes, Latimer, LeFlore, McIntosh, Muskogee and 6 more | 3 hr |
| Apr 20, 9:57 PM MDT | Mesoscale Discussion | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 93 min |
| Apr 21, 11:58 AM MDT | Mesoscale Discussion | SPC | Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 34 more | 2 hr |
| Apr 21, 12:50 PM MDT | Tornado Watch | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 55 more | 7 hr |
| Apr 21, 3:39 PM MDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 47 more | 66 min |
| Apr 21, 5:02 PM MDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Blaine, Canadian, Cherokee and 43 more | 88 min |
| Apr 21, 4:30 PM MDT | Mesoscale Discussion | SPC | Cooke, Grayson, Montague | 60 min |
Nearby
Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Kansas, 2004Mesoscale Discussions in Colorado, 2004Every 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.