Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 839
The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 1:57 AM CDT for 20 counties in Oklahoma; 4 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 8, 2003, 1:57 AM CDT (06:57 UTC)
- Expired
- May 8, 2003, 4:00 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Atoka County, OK, Beckham County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK, Tillman County, OK, Cooke County, TX, Fannin County, TX, Grayson County, TX, Montague County, TX
The radar
The Altus AFB radar (KFDR), 74 km from the middle of the area, began a volume at 06:57 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, 7.0 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
- 1026 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1110 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 300 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.9
The text
As transmitted, in the capitals the NWS used until 2016.
863 ACUS11 KWNS 080657 SWOMCD SPC MCD 080657 OKZ000-TXZ000-080900- MESOSCALE DISCUSSION 0839 NWS STORM PREDICTION CENTER NORMAN OK 0157 AM CDT THU MAY 08 2003 AREAS AFFECTED...SRN OK...PORTIONS N-CENTRAL TX CONCERNING...TORNADO WATCH 293... VALID 080657Z - 080900Z PAIR OF POTENTIALLY TORNADIC SUPERCELLS CONTINUES MOVING EWD ACROSS S-CENTRAL OK...EXPECTED TO MOVE ACROSS PORTIONS GARVIN/MURRAY/CARTER COUNTIES THEN HEADED FOR PORTIONS PONTOTOC/JOHNSTON/MARSHALL/BRYAN/COAL COUNTIES NEXT FEW HOURS. ADDITIONAL WW MAY BE REQUIRED ACROSS PORTIONS S-CENTRAL/SERN OK NEAR EXPIRATION TIME OF WW 293 IF CONVECTIVE TRENDS WARRANT. BECAUSE OF THEIR SIZE...PROFUSE PRECIP PRODUCTION AND CLOSE PROXIMITY -- 20-25 NM SEPARATION BETWEEN CIRCULATIONS -- NRN STORM MAY INGEST OUTFLOW OR PRECIP FROM SRN STORM AND WEAKEN...HOWEVER IN INTERIM WILL MAINTAIN THREAT OF DESTRUCTIVE HAIL AND TORNADOES. MUCAPE 2500-4000 J/KG INDICATED IN MODIFIED RUC SOUNDINGS OVER AREA...ALONG WITH 0-3 KM SRH 300-500 J/KG RANGE. LATTER IS CLOSELY CORROBORATED BY OBSERVED FWD VWP HODOGRAPH...WHICH SHOWS 50-60 KT LLJ IMPINGING UPON THIS ACTIVITY. ALTHOUGH LOW LEVEL AIR MASS REMAINS VERY MOIST AND SUPPORTIVE OF SEVERE TSTMS...AND DRYLINE REMAINS W OF REGION...INCREASING CINH OVERNIGHT ACROSS AREA SUGGESTS PROBABILITIES FOR ADDITIONAL DEVELOPMENT ARE DIMINISHING FROM SW-NE. ACCORDINGLY...WW MAY BE CLEARED FROM SW-NE OR W-E AS TRENDS INDICATE LITTLE POTENTIAL FOR STORM GENESIS. ..EDWARDS.. 05/08/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN... 34549998 35379995 34669602 33239604 33419708
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 8:01 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Comanche, Cotton, Greer, Harmon and 4 more | 59 min |
| May 7, 10:35 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Cherokee, Cleveland and 29 more | 55 min |
| May 7, 10:35 PM CDT | Tornado Watch | SPC | Beckham, Bryan, Carter, Coal, Comanche, Cotton and 13 more | 5 hr |
| May 7, 10:55 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 39 more | 5 hr |
| May 7, 11:51 PM CDT | Mesoscale Discussion | SPC | Beckham, Bryan, Carter, Coal, Comanche, Cotton and 13 more | 54 min |
| May 8, 1:18 AM CDT | Mesoscale Discussion | SPC | Adair, Blaine, Cherokee, Craig, Custer, Delaware and 19 more | 3 hr |
| May 8, 1:55 AM CDT | Severe Thunderstorm Watch | SPC | Craig, Delaware, Grant, Kay, Nowata, Osage and 2 more | 5 hr |
| May 8, 3:50 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 25 more | 3 hr |
| May 8, 3:51 AM CDT | Mesoscale Discussion | SPC | Ottawa | 3 hr |
| May 8, 5:02 AM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Choctaw, Coal, Creek and 24 more | 2 hr |
| May 8, 6:20 AM CDT | Tornado Watch | SPC | Haskell, Latimer, LeFlore, Sequoyah | 3 hr |
| May 8, 12:49 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Garfield, Grant, Kingfisher, Kiowa and 1 more | 3 hr |
| May 8, 1:35 PM CDT | Tornado Watch | SPC | Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more | 7 hr |
| May 8, 3:34 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Caddo, Canadian, Carter, Cleveland, Comanche and 25 more | 116 min |
| May 8, 4:47 PM CDT | Mesoscale Discussion | SPC | Canadian, Cleveland, Grady, Lincoln, Logan, McClain and 3 more | 58 min |
| May 8, 5:31 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Coal, Craig, Creek, Delaware and 17 more | 59 min |
| May 8, 5:45 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Coal, Craig, Delaware, Haskell and 17 more | 5 hr |
| May 8, 6:38 PM CDT | Mesoscale Discussion | SPC | Adair, Carter, Cherokee, Cleveland, Coal, Craig and 35 more | 2 hr |
| May 7, 8:15 PM CDT | Tornado Watch | SPC | Bosque, Coryell, Ellis, Erath, Freestone, Hamilton and 7 more | 6 hr |
| May 8, 2:43 PM CDT | Mesoscale Discussion | SPC | Archer, Bosque, Brown, Burnet, Callahan, Clay and 28 more | 62 min |
| May 8, 3:40 PM CDT | Tornado Watch | SPC | Archer, Brown, Callahan, Clay, Coleman, Comanche and 18 more | 5 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Texas, 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.