Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 402
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 5:09 AM CDT for 53 counties in Oklahoma. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2003, 5:09 AM CDT (10:09 UTC)
- Expired
- Apr 6, 2003, 6:45 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 53 counties
Alfalfa County, OK, Atoka County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble 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, Roger Mills County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washita County, OK, Woods County, OK, Woodward County, OK
The radar
The Norman radar (KTLX), 47 km from the middle of the area, began a volume at 10:10 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, 10.2 hours before the alert went out and 47 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
- 2069 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 456 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
223 ACUS11 KWNS 061010 SWOMCD SPC MCD 061009 OKZ000-061145- MESOSCALE DISCUSSION 0402 NWS STORM PREDICTION CENTER NORMAN OK 0509 AM CDT SUN APR 06 2003 AREAS AFFECTED...OK CONCERNING...SEVERE THUNDERSTORM WATCH 97... VALID 061009Z - 061145Z THE SEVERE WEATHER THREAT CONTINUES ACROSS THE WW AREA. A NEW WW MAY BE REQUIRED BEFORE 11Z. FREDRICK/TWIN LAKES RADAR IMAGERY SHOWS STRENGTHENING TSTM EXHIBITING MID-LEVEL ROTATION CURRENTLY OVER CADDO COUNTY. THIS STORM IS MOVING/PROPAGATING ALONG A SECONDARY SURFACE WARM FRONT THAT EXTENDS FROM A SURFACE LOW NEAR LTS NEWD TO NEAR OKC AND THEN EWD INTO E-CNTRL OK. ADDITIONAL ELEVATED CONVECTION IS TRYING TO BECOMING ESTABLISHED FARTHER TO THE NE FROM CREEK COUNTY EWD INTO MUSKOGEE COUNTY IN A ZONE OF STRONG WAA...PER OBSERVED SURFACE PRESSURE FALLS ACROSS THE NRN HALF OF OK. THE CADDO COUNTY STORM MAY BE CURRENTLY NEAR SURFACE BASED DUE TO IT/S CLOSE PROXIMITY TO UPPER 50S/LOWER 60S DEWPOINTS IN PLACE ACROSS SWRN OK. AS IT MOVES NEWD ALONG SECONDARY WARM FRONT...IT WILL LIKELY BECOME MORE ELEVATED BUT WILL STILL HAVE THE POTENTIAL TO PRODUCE LARGE HAIL. SINCE THE SEVERE WEATHER POTENTIAL WILL LIKELY EXTEND BEYOND 11Z...A NEW WW WILL LIKELY BE REQUIRED FOR CENTRAL AND ERN OK. ..MEAD.. 04/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...TSA...OUN... 35889979 36569962 36869865 36719729 36669558 36319460 34589496 34129510 34129694 34309854 34879962 35439978
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, 5:35 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Cherokee and 46 more | 4 hr |
| Apr 6, 7:45 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 44 more | 2 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.