Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 522
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 7:06 PM CDT for 9 counties in Arkansas; 4 counties in Missouri; 45 counties in Oklahoma. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2004, 7:06 PM CDT (00:06 UTC)
- Expired
- Apr 30, 2004, 9:00 PM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 58 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Logan County, AR, Madison County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Kay County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 83 km from the middle of the area, began a volume at 00:06 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 00:00Z, 0.1 hours before the alert went out and 125 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 530 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 410 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
The text
As transmitted, in the capitals the NWS used until 2016.
479 ACUS11 KWNS 010007 SWOMCD SPC MCD 010006 ARZ000-MOZ000-OKZ000-KSZ000-TXZ000-010200- MESOSCALE DISCUSSION 0522 NWS STORM PREDICTION CENTER NORMAN OK 0706 PM CDT FRI APR 30 2004 AREAS AFFECTED...NCENTRAL/ERN OK....NWRN AR...SWRN MO AND FAR SERN KS CONCERNING...SEVERE THUNDERSTORM WATCH 133... VALID 010006Z - 010200Z MID LEVEL HEIGHT FALLS HAVE AIDED IN INCREASING ELEVATED CONVECTIVE COVERAGE OVER CENTRAL OK INTO SCENTRAL KS. MUCAPE VALUES AROUND 1000 J/KG ALONG WITH 40 KTS OF DEEP LAYER SHEAR WILL AID IN ISOLATED TO SCATTERED SEVERE HAIL POTENTIAL. LARGE SCALE LIFT WILL SPREAD EWD INTO WW 133 AND ALLOW FOR SEVERE THREAT TO INCREASE OVER MUCH OF NRN HALF OF WW 133 /NORTH OF STATIONARY BOUNDARY/ DURING THE NEXT FEW HOURS. WHERE ANVIL PRECIP HAS STABILIZED THE AIRMASS OVER SERN OK...OVERALL SEVERE THREAT APPEARS TO BE DIMINISHING AT LEAST FOR THE NEXT SEVERAL HOURS. THE EXCEPTION WILL BE OVER CHOCTAW COUNTY WHERE HP SUPERCELL WILL MOVE EWD INTO THE COUNTY BETWEEN 01Z AND 02Z. ..CROSBIE.. 05/01/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN... 33799605 34349754 35069809 35669802 36879746 36979626 37169447 36919345 35139352
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 7:22 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Little River, Miller, Sevier | 83 min |
| Apr 30, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | Howard, Little River, Pike, Sevier | 5 hr |
| Apr 30, 9:05 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Crawford, Sebastian, Washington | 5 hr |
| Apr 30, 9:54 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Pike, Sevier | 96 min |
| Apr 30, 11:45 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Sebastian, Washington | 90 min |
| May 1, 12:50 AM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 6 hr |
| May 1, 1:11 AM CDT | Mesoscale Discussion | SPC | Crawford, Sebastian, Washington | 64 min |
| May 1, 2:38 AM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Columbia, Hempstead, Lafayette, Miller and 3 more | 37 min |
| May 1, 3:10 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more | 6 hr |
| May 1, 5:13 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more | 92 min |
| May 1, 12:59 AM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Madison and 7 more | 91 min |
| Apr 30, 8:14 PM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Jefferson, Love, Marshall | 91 min |
Nearby
Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Missouri, 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.