Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 433
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2004, 3:26 PM CDT for 12 counties in Arkansas; 22 counties in Oklahoma. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2004, 3:26 PM CDT (20:26 UTC)
- Expired
- Apr 22, 2004, 4:30 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 34 counties
Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Cherokee County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK
The radar
The Western Arkansas radar (KSRX), 82 km from the middle of the area, began a volume at 20:28 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
Norman, OK (KOUN), launched 12:00Z, 8.4 hours before the alert went out and 194 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
- 900 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 473 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.3
The text
As transmitted, in the capitals the NWS used until 2016.
152 ACUS11 KWNS 222026 SWOMCD SPC MCD 222026 ARZ000-OKZ000-222130- MESOSCALE DISCUSSION 0433 NWS STORM PREDICTION CENTER NORMAN OK 0326 PM CDT THU APR 22 2004 AREAS AFFECTED...SERN OK...NWRN AR CONCERNING...TORNADO WATCH 104... VALID 222026Z - 222130Z ...SUPERCELLS ARE INTENSIFYING OVER NERN OK... SEWD-MOVING COLD FRONT HAS ALL BUT SLOWED ITS PROGRESS ACROSS NWRN PORTIONS OF WW. LATEST RADAR/SFC DATA SUGGESTS DRY LINE MAY BE LIFTING NWWD ACROSS PORTIONS OF NCNTRL TX/SCNTRL OK...ALLOWING MORE SELY LOW LEVEL COMPONENT AND ENHANCED SHEAR TO DEVELOP ACROSS SRN HALF OF WW. ISOLATED STORMS ARE INTENSIFYING ALONG COLD FRONT NEAR TUL. SUSTAINED CONVERGENCE ALONG THIS ZONE SHOULD ALLOW ACTIVITY TO CONTINUE STRENGTHENING OVER THE NEXT FEW HOURS AS IT MOVES EWD INTO NWRN AR. OTHER DEVELOPMENT IS LIKELY ALONG COLD FRONT SW OF THIS REGION...THEN SWD ALONG DRY LINE BY 00Z. ..DARROW.. 04/22/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...TSA...OUN... 35129716 36339528 36139276 34959275 34809445 33939727
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 7:01 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 119 min |
| Apr 21, 8:12 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Benton, Boone, Bradley and 52 more | 63 min |
| Apr 21, 10:10 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 95 min |
| Apr 21, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Sebastian | 5 hr |
| Apr 22, 1:43 AM CDT | Mesoscale Discussion | SPC | Crawford, Logan, Sebastian | 92 min |
| Apr 22, 12:32 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 88 min |
| Apr 22, 1:40 PM CDT | Tornado Watch | SPC | Benton, Boone, Carroll, Crawford, Franklin, Howard and 12 more | 6 hr |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Franklin, Howard and 12 more | 63 min |
| Apr 22, 6:23 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Crawford, Franklin, Howard, Johnson and 11 more | 67 min |
| Apr 21, 7:06 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Blaine, Dewey, Ellis, Harper and 3 more | 2 hr |
| Apr 21, 7:51 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more | 84 min |
| Apr 21, 8:35 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more | 5 hr |
| Apr 21, 8:35 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more | 5 hr |
| Apr 21, 10:26 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 7 more | 64 min |
| Apr 21, 10:56 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more | 94 min |
| Apr 22, 4:30 PM CDT | Tornado Watch | SPC | Bryan, Love | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Arkansas, 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.