Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 409
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 1:56 PM CDT for 6 counties in Kansas; Beaver County, Cimarron County, Texas County, Oklahoma; 10 counties in Texas. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2004, 1:56 PM CDT (18:56 UTC)
- Expired
- Apr 21, 2004, 3:30 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
Counties Grant 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, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Roberts County, TX, Sherman County, TX
The radar
The Amarillo radar (KAMA), 153 km from the middle of the area, began a volume at 18:58 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
Dodge City, (KDDC), launched 12:00Z, 6.9 hours before the alert went out and 195 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.
477 ACUS11 KWNS 211856 SWOMCD SPC MCD 211856 TXZ000-OKZ000-KSZ000-COZ000-212030- MESOSCALE DISCUSSION 0409 NWS STORM PREDICTION CENTER NORMAN OK 0156 PM CDT WED APR 21 2004 AREAS AFFECTED...SERN CO...SWRN KS...OK PANHANDLE...NERN TX PANHANDLE CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 211856Z - 212030Z ...SEVERE THUNDERSTORMS WILL SOON DEVELOP ACROSS THE SRN HIGH PLAINS... EXIT REGION OF UPPER JET APPEARS TO BE AGITATING CU FIELD FROM NWRN TX PANHANDLE INTO SWRN KS. VERY COLD MID LEVEL TEMPERATURES WILL CONTRIBUTE TO STEEP LAPSE RATES AND INCREASING INSTABILITY AS ELY LOW LEVEL FLOW CONTINUES TO ADVECT MOISTURE WWD. IT APPEARS THUNDERSTORMS WILL SOON DEVELOP ACROSS THIS REGION WHERE VERTICAL SHEAR PROFILES WILL FAVOR SUPERCELL DEVELOPMENT. TORNADO WATCH WILL LIKELY BE ISSUED FOR THIS REGION BY 20Z. ..DARROW.. 04/21/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DDC...AMA...PUB... 37160261 37680162 37410023 36200013 35110034 35800186 36290288
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 7:22 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more | 23 min |
| Apr 21, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | Grant, Hamilton, Haskell, Meade, Morton, Seward and 2 more | 6 hr |
| Apr 21, 5:09 PM CDT | Mesoscale Discussion | SPC | Grant, Hamilton, Haskell, Meade, Morton, Seward and 2 more | 66 min |
| Apr 20, 7:50 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 5 hr |
| Apr 20, 8:57 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 2 hr |
| Apr 20, 10:39 PM CDT | Mesoscale Discussion | SPC | Haskell, Hughes, Latimer, LeFlore, McIntosh, Muskogee and 6 more | 3 hr |
| Apr 20, 10:57 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Cleveland, Craig, Creek, Delaware and 13 more | 93 min |
| Apr 21, 12:58 PM CDT | Mesoscale Discussion | SPC | Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 34 more | 2 hr |
| Apr 21, 1:50 PM CDT | Tornado Watch | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 55 more | 7 hr |
| Apr 21, 4:39 PM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Caddo and 47 more | 66 min |
| Apr 21, 6:02 PM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Blaine, Canadian, Cherokee and 43 more | 88 min |
| Apr 21, 5:30 PM CDT | Mesoscale Discussion | SPC | Cooke, Grayson, Montague | 60 min |
Nearby
Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Kansas, 2004Mesoscale Discussions in Oklahoma, 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; radar from the NEXRAD Level II archive.