Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 672
The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 6:58 PM CDT for 16 counties in Arkansas; 18 counties in Oklahoma. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- May 1, 2003, 6:58 PM CDT (23:58 UTC)
- Expired
- May 1, 2003, 8:30 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 34 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Western Arkansas radar (KSRX), 42 km from the middle of the area, began a volume at 00:04 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
Springfield, MO (KSGF), launched 12:00Z, 12.0 hours before the alert went out and 220 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
- 816 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -340 m²/s²
- 0-3 km storm-relative helicity
- -135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
786 ACUS11 KWNS 012358 SWOMCD SPC MCD 012358 ARZ000-OKZ000-TXZ000-020130- MESOSCALE DISCUSSION 0672 NWS STORM PREDICTION CENTER NORMAN OK 0658 PM CDT THU MAY 01 2003 AREAS AFFECTED...ERN OK/WRN AR CONCERNING...TORNADO WATCH 202... VALID 012358Z - 020130Z IN ADDITION TO LARGE HAIL...ISOLATED TORNADO THREAT WILL CONTINUE ACROSS WW0200 FOR THE NEXT FEW HOURS. LATEST TULSA RADAR DATA INDICATE SEVERAL SUPERCELLS IN PROGRESS OVER ERN OK. THE MOST INTENSE STORM WHICH HAS A HISTORY OF PRODUCING TORNADOES WAS OVER NRN SEQUOYAH COUNTY IN ERN OK MOVING SEWD AT 20KTS. THIS STORM IS LOCATED JUST E OF A SURFACE LOW...PER MESONET DATA...WITH THE ADDITIONAL STRONG TO SEVERE STORMS LOCATED JUST E OF A PRE-FRONTAL TROUGH WHICH EXTENDS SWD FROM THE LOW TO JUST E OF DUA. THE AIRMASS TO THE E OF SURFACE LOW AND ATTENDANT TROUGH REMAINS VERY UNSTABLE WITH MLCAPES OF 2500-3500 J/KG. THIS IN COMBINATION WITH 0-6KM AGL SHEAR OF 40-45KTS WILL CONTINUE TO SUPPORT SUPERCELLS ACROSS THE WW AREA. THE GREATEST TORNADO THREAT WILL REMAIN ACROSS FAR ERN OK INTO WRN AR INVOF THE SURFACE LOW WHERE BACKED NEAR SURFACE WINDS ARE RESULTING IN 0-1KM SRH VALUES OF 100-150 M2/S2. MOREOVER...RELATIVELY LOW LCL HEIGHTS /AOB 1KM/ ARE ALSO CONTRIBUTING TO FAVORABLE LOW-LEVEL CONDITIONS FOR ISOLATED TORNADOES. ..MEAD.. 05/01/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SHV...TSA...FWD...OUN... 34219585 35039590 35729598 36279598 36439598 36479598 36459553 36419478 36439422 36459386 36439363 36439349 36399349 35799347 35209345 34479345 34059342 33849343 33779344 33739348 33749454 33759537 33779566 33759582 33759585 33939585
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 7:51 AM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Fulton, Izard, Randolph, Searcy and 1 more | 114 min |
| May 1, 9:35 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Greene | 5 hr |
| May 1, 11:23 AM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Mississippi, St. Francis | 2 hr |
| May 1, 2:13 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Polk, Scott, Sevier | 3 hr |
| May 1, 2:55 PM CDT | Tornado Watch | SPC | Little River | 5 hr |
| May 1, 3:45 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Howard, Johnson and 9 more | 5 hr |
| May 1, 6:10 PM CDT | Mesoscale Discussion | SPC | Arkansas, Dallas, Hempstead, Jefferson, Lee, Little River and 3 more | 95 min |
| Apr 30, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 6 hr |
| Apr 30, 8:17 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more | 88 min |
| Apr 30, 9:52 PM CDT | Mesoscale Discussion | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 83 min |
| Apr 30, 11:47 PM CDT | Mesoscale Discussion | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 118 min |
| May 1, 12:10 AM CDT | Severe Thunderstorm Watch | SPC | Craig, Garfield, Grant, Kay, Noble, Nowata and 4 more | 5 hr |
| May 1, 2:27 AM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more | 2 hr |
| May 1, 10:55 AM CDT | Mesoscale Discussion | SPC | Bryan, Coal, Johnston, Love, Marshall | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Arkansas, 2003Every mesoscale discussion in 2003
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.