Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 787
The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 10:32 AM CDT for 5 counties in Arkansas; McDonald County, Missouri; 25 counties in Oklahoma. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2003, 10:32 AM CDT (15:32 UTC)
- Expired
- May 6, 2003, 12:30 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 31 counties
Benton County, AR, Crawford County, AR, Franklin County, AR, Sebastian County, AR, Washington County, AR, McDonald County, MO, Adair County, OK, Atoka County, OK, Cherokee County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 15:36 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, 3.5 hours before the alert went out and 191 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
- 236 J/kg
- Mixed-layer CIN
- -453 J/kg
- Mixed-layer LCL
- 2191 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
111 ACUS11 KWNS 061533 SWOMCD SPC MCD 061532 ARZ000-MOZ000-OKZ000-061730- MESOSCALE DISCUSSION 0787 NWS STORM PREDICTION CENTER NORMAN OK 1032 AM CDT TUE MAY 06 2003 AREAS AFFECTED...E OK/NW AR CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 061532Z - 061730Z SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP ACROSS ERN OK BY EARLY AFTERNOON. CONVECTION WILL HAVE THE POTENTIAL FOR LARGE HAIL...DAMAGING WINDS OR TORNADOES. TORNADO POTENTIAL WILL INCREASE BY LATE AFTERNOON. WW MAY BE NECESSARY LATE THIS MORNING OR EARLY THIS AFTERNOON ACROSS ERN OK/FAR NWRN AR. STATIONARY FRONT EXTENDED ENE OF A SURFACE LOW OVER CNTRL OK. DEWPOINTS WERE IN THE LOWER 70S S OF THE FRONT. TEMPERATURES AT 15Z WERE ALREADY AROUND 80. MID-LEVEL JET WITH THE LEADING EDGE OF DRYER AIR CONTAINED STEEP LAPSE RATES OF 8.5 C/KG...WHILE SFC HEATING IS INCREASING INSTABILITY. MLCAPE VALUES RANGED BETWEEN 3000 AND 4000 J/KG ACROSS ERN OK. RAPID DEVELOPMENT OF CONVECTION APPEARS LIKELY ALONG THE INSTABILITY AXIS LATER THIS MORNING OR EARLY THIS AFTERNOON. STRONG INSTABILITY...STEEP LAPSE RATES AND DEEP LAYER SHEAR OF 55 KT SUGGEST STORMS WILL BECOME SUPERCELLULAR. CONVECTION WILL HAVE THE POTENTIAL FOR LARGE HAIL AND OR DAMAGING WINDS. IN ADDITION...LOW-LEVEL JET ACROSS ERN OK AND WRN AR WILL MAKE A FEW TORNADOES LIKELY ACROSS ERN OK THIS AFTERNOON. WW WILL LIKELY BE NECESSARY BY 19Z. ..BROYLES.. 05/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SGF...SHV...TSA...OUN... 34089575 34329663 35529659 36299651 36729606 36919562 36919485 36849414 36399372 35069397 34159455
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 9:05 PM CDT | Tornado Watch | SPC | Phillips | 7 hr |
| May 5, 10:58 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Fulton, Marion | 2 hr |
| May 6, 1:26 AM CDT | Mesoscale Discussion | SPC | Crittenden, Lee, St. Francis | 3 hr |
| May 6, 1:50 AM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 6 hr |
| May 6, 5:06 AM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Mississippi, Phillips, St. Francis | 3 hr |
| May 6, 11:40 AM CDT | Tornado Watch | SPC | Benton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more | 7 hr |
| May 6, 3:05 PM CDT | Tornado Watch | SPC | Logan, Polk, Scott, Sebastian | 6 hr |
| May 6, 5:33 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Franklin, Fulton, Johnson and 6 more | 117 min |
| May 6, 6:55 PM CDT | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Clark, Cleburne and 32 more | 5 hr |
| May 6, 6:49 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Caldwell, Camden, Carroll and 27 more | 3 hr |
| May 6, 7:55 AM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cass, Cedar and 22 more | 5 hr |
| May 6, 11:29 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Cass, Cedar, Clay and 18 more | 2 hr |
| May 6, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Cole, Crawford, Dent, Franklin, Gasconade, Iron and 16 more | 4 hr |
| May 6, 2:15 PM CDT | Tornado Watch | SPC | Boone, Callaway, Camden, Carter, Cole, Cooper and 27 more | 5 hr |
| May 6, 3:42 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Callaway, Camden and 20 more | 2 hr |
| May 6, 5:08 PM CDT | Mesoscale Discussion | SPC | Franklin, Jefferson, Saint Charles, Saint Louis, Warren, City of Saint Louis | 2 hr |
| May 6, 5:40 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Iron, Jefferson, Madison and 11 more | 6 hr |
| May 6, 6:35 PM CDT | Tornado Watch | SPC | Barry, Barton, Camden, Carter, Cedar, Christian and 31 more | 5 hr |
| May 6, 2:47 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Latimer and 5 more | 118 min |
Nearby
Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Missouri, 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.