Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 405
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 7:45 AM CDT for 50 counties in Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2003, 7:45 AM CDT (12:45 UTC)
- Expired
- Apr 6, 2003, 9:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McCurtain 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, 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, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Norman radar (KTLX), 62 km from the middle of the area, began a volume at 12:48 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, 0.8 hours before the alert went out and 71 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
- 710 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 498 m²/s²
- 0-3 km storm-relative helicity
- 695 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
342 ACUS11 KWNS 061245 SWOMCD SPC MCD 061245 OKZ000-TXZ000-061445- MESOSCALE DISCUSSION 0405 NWS STORM PREDICTION CENTER NORMAN OK 0745 AM CDT SUN APR 06 2003 AREAS AFFECTED...CNTRL/ERN OK CONCERNING...SEVERE THUNDERSTORM WATCH 98... VALID 061245Z - 061445Z THE THREAT FOR PRIMARILY LARGE HAIL WILL CONTINUE FOR THE NEXT FEW HOURS E OF I-35. LATEST TWIN LAKES RADAR IMAGERY SHOWS CLUSTER OF ELEVATED TSTMS OVER CNTRL INTO NERN OK. THE MOST INTENSE STORM OVER OKFUSKEE COUNTY CONTINUES TO EXHIBIT SUPERCELL CHARACTERISTICS AND HAS A HISTORY OF PRODUCING LARGE HAIL. THIS STORM WILL POSE A LARGE HAIL THREAT AS IT MOVES ENEWD AT 35-40 KTS. COMBINATION OF MUCAPES OF 1000-1500 J/KG AND FAVORABLE DEEP LAYER SHEAR THROUGH CLOUD BEARING LAYER...PER REGIONAL VWP/PROFILER DATA...INDICATE A CONTINUED THREAT OF LARGE HAIL WITH TSTMS STRENGTHENING JUST E OF THE I-35 CORRIDOR. THE CLUSTER OF TSTMS SHOULD SHIFT INTO ERN PORTIONS OF WW0098 AS LLJ VEERS TO MORE OF A SWLY DIRECTION. ..MEAD.. 04/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...TSA...FWD...OUN... 33999795 34349835 35639833 36629839 36849727 36869597 36829490 35939469 34869467 34009475 33919590 33979689
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 6:35 PM CST | Mesoscale Discussion | SPC | Love | 115 min |
| Apr 5, 6:40 PM CST | Tornado Watch | SPC | Jackson | 5 hr |
| Apr 5, 6:55 PM CST | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 14 more | 95 min |
| Apr 5, 7:10 PM CST | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more | 5 hr |
| Apr 5, 8:04 PM CST | Mesoscale Discussion | SPC | Love | 116 min |
| Apr 5, 9:35 PM CST | Tornado Watch | SPC | Love | 5 hr |
| Apr 5, 11:10 PM CST | Mesoscale Discussion | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Bryan and 54 more | 65 min |
| Apr 5, 11:35 PM CST | Severe Thunderstorm Watch | SPC | Atoka, Beckham, Blaine, Caddo, Canadian, Carter and 51 more | 5 hr |
| Apr 6, 5:09 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Atoka, Beckham, Blaine, Caddo, Canadian and 47 more | 96 min |
| Apr 6, 5:35 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Cherokee and 46 more | 4 hr |
| Apr 6, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 26 more | 5 hr |
| Apr 6, 12:27 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Choctaw, Coal, Haskell and 17 more | 2 hr |
| Apr 6, 2:18 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Choctaw, Haskell, Latimer and 5 more | 57 min |
| Apr 6, 2:55 PM CDT | Severe Thunderstorm Watch | SPC | Choctaw, LeFlore, McCurtain, Pushmataha, Sequoyah | 5 hr |
Nearby
Mesoscale Discussions in Oklahoma, 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.