Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 879
The Storm Prediction Center issued this mesoscale discussion at May 9, 2003, 2:52 PM CDT for 21 counties in Oklahoma; 12 counties in Texas. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- May 9, 2003, 2:52 PM CDT (19:52 UTC)
- Expired
- May 9, 2003, 4:45 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 33 counties
Caddo County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Lincoln County, OK, Love County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Haskell County, TX, Jack County, TX, Montague County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 62 km from the middle of the area, began a volume at 19:53 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, 7.9 hours before the alert went out and 148 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
- 9 J/kg
- Mixed-layer CIN
- -506 J/kg
- Mixed-layer LCL
- 2120 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.5
The text
As transmitted, in the capitals the NWS used until 2016.
465 ACUS11 KWNS 091952 SWOMCD SPC MCD 091952 OKZ000-TXZ000-092145- MESOSCALE DISCUSSION 0879 NWS STORM PREDICTION CENTER NORMAN OK 0252 PM CDT FRI MAY 09 2003 AREAS AFFECTED...NWRN TX...SWRN-NERN OK CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 091952Z - 092145Z ...SEVERE THUNDERSTORMS SHOULD DEVELOP IN THE NEXT FEW HOURS FROM NWRN TX INTO CENTRAL-NERN OK. TORNADO WATCH WILL BE ISSUED SOON... CYCLICAL ATTEMPTS AT SUSTAINED DEEP CONVECTION ARE OCCURRING NW OF ABI AHEAD OF A WEAK VORT MAX/SHORTWAVE TROUGH. THIS FEATURE IS OBSERVED IN BOTH THE WATER VAPOR AND IR IMAGERY AND IS LIFTING NEWD AT ROUGHLY 20KT TOWARD SPS...ALONG AN AXIS OF APPARENTLY UNCAPPED BOUNDARY LAYER WITH SBCAPE VALUES OF 4000 J/KG. VIS SATELLITE IMAGERY SUPPORTS THIS WITH NWWD RETREATING LINE OF CU. TORNADO WATCH WILL BE ISSUED SOON. ..DARROW.. 05/09/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TSA...FWD...OUN...SJT...LUB... 33000017 34939869 36229702 35759591 33739730 32419925
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 8:30 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more | 60 min |
| May 8, 11:14 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Coal, Garvin, Haskell and 16 more | 91 min |
| May 9, 3:35 PM CDT | Tornado Watch | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 18 more | 5 hr |
| May 9, 4:45 PM CDT | Tornado Watch | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 4 more | 6 hr |
| May 9, 5:36 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more | 84 min |
| May 9, 9:08 AM CDT | Mesoscale Discussion | SPC | Borden, Callahan, Coke, Dickens, Fisher, Foard and 16 more | 3 hr |
| May 9, 4:58 PM CDT | Mesoscale Discussion | SPC | Callahan, Coke, Concho, Crockett, Fisher, Glasscock and 11 more | 32 min |
| May 9, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | Callahan, Coke, Crockett, Fisher, Irion, Jones and 10 more | 6 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.