Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 921
The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 5:37 PM CDT for 21 counties in Oklahoma; Childress County, Texas. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2004, 5:37 PM CDT (22:37 UTC)
- Expired
- May 26, 2004, 7:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 22 counties
Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Childress County, TX
The radar
The Altus AFB radar (KFDR), 121 km from the middle of the area, began a volume at 22:36 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
Fort Sill, OK (KFSI), launched 12:00Z, 10.6 hours before the alert went out and 90 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
- 708 J/kg
- Mixed-layer CIN
- -291 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
305 ACUS11 KWNS 262237 SWOMCD SPC MCD 262237 OKZ000-TXZ000-270000- MESOSCALE DISCUSSION 0921 NWS STORM PREDICTION CENTER NORMAN OK 0537 PM CDT WED MAY 26 2004 AREAS AFFECTED...WRN/CENTRAL OK CONCERNING...TORNADO WATCH 298... VALID 262237Z - 270000Z CONTINUE WW. AT 2220Z...SUPERCELL WAS LOCATED 40 ENE CSM MOVING ENEWD AT 40KT. PRESENT MOTION SUGGESTS STORM IS ROOTED ABOVE THE BOUNDARY LAYER WITH LARGE HAIL THE PRIMARY THREAT. EXTRAPOLATION TAKES THIS STORM INTO THE WRN/NRN PORTION OF THE OKC METRO AREA BETWEEN 2330-0000Z...WITH POTENTIAL FOR CONTINUED STORM SPLITS DURING THE NEXT 1-2 HOURS. AN ADDITIONAL WW MAY BE NEEDED EWD IN CENTRAL OK TO ADDRESS SEVERE THREAT ASSOCIATED WITH THESE CELLS. IF RIGHT MOVING CELL SLOWS DOWN AND MOVES WITH MORE OF AN ELY COMPONENT...THIS WOULD STRONGLY INDICATE UPDRAFT HAS BECOME ROOTED IN MORE UNSTABLE BOUNDARY LAYER AIR MASS /100MB MLCAPE AROUND 3000 J/KG/. TLX VAD INDICATES A SURFACE BASED SUPERCELL WOULD MOVE ROUGHLY 270/20 KT GIVEN PRESENT VERTICAL WIND PROFILE. THIS WOULD CONDITIONALLY INCREASE TORNADO THREAT...BUT PRESENCE OF MODERATE CAPPING INVERSION MAKES THIS SCENARIO UNCERTAIN. OTHER ISOLATED STORM DEVELOPMENT IS POSSIBLE ACROSS FAR SWRN OK IN VICINITY OF NOW RETREATING DRYLINE OVER SRN JACKSON COUNTY OK AND HARDEMAN COUNTY TX. ..BANACOS.. 05/26/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OUN...LUB...AMA... 34439847 34430056 36959901 36909693
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 7:07 PM CDT | Mesoscale Discussion | SPC | Carter, Comanche, Cotton, Garvin, Jefferson, Johnston and 5 more | 113 min |
| May 25, 11:28 PM CDT | Mesoscale Discussion | SPC | Harmon, Jackson | 2 hr |
| May 26, 12:12 PM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Greer, Harmon, Jackson and 3 more | 3 hr |
| May 26, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | Greer, Harmon, Jackson | 6 hr |
| May 26, 3:55 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 16 more | 6 hr |
| May 26, 6:07 PM CDT | Mesoscale Discussion | SPC | Greer, Harmon, Jackson | 83 min |
| May 26, 6:25 PM CDT | Tornado Watch | SPC | Cleveland, Creek, Grady, Lincoln, Logan, McClain and 7 more | 5 hr |
| May 26, 6:37 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 24 more | 83 min |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Texas, 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.