Alert archive / Oklahoma / Mesoscale Discussions in 2017
Mesoscale Discussion 744
The Storm Prediction Center issued this mesoscale discussion at May 16, 2017, 9:53 PM CDT for Cowley County, Harper County, Sumner County, Kansas; 22 counties in Oklahoma; 4 counties in Texas. It was in force for 37 min.
The area
The outline as issued.
The facts
- Issued
- May 16, 2017, 9:53 PM CDT (02:53 UTC)
- Expired
- May 16, 2017, 10:30 PM CDT
- In force
- 37 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 29 counties
Cowley County, KS, Harper County, KS, Sumner County, KS, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Clay County, TX, Montague County, TX, Wichita County, TX
The radar
The Norman radar (KTLX), 58 km from the middle of the area, began a volume at 02:56 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, 2.9 hours before the alert went out and 44 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
- 768 J/kg
- Mixed-layer CIN
- -307 J/kg
- Mixed-layer LCL
- 953 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
848 ACUS11 KWNS 170254 SWOMCD SPC MCD 170253 KSZ000-OKZ000-TXZ000-170330- Mesoscale Discussion 0744 NWS Storm Prediction Center Norman OK 0953 PM CDT Tue May 16 2017 Areas affected...south-central KS...central OK...western north-central TX Concerning...Severe potential...Watch needed soon Valid 170253Z - 170330Z Probability of Watch Issuance...95 percent SUMMARY...A replacement watch (likely severe thunderstorm) will be issued very shortly. DISCUSSION...A large hail/severe gust risk is forecast for this evening into the overnight. ..Smith/Guyer.. 05/17/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TSA...ICT...FWD...OUN...SJT... LAT...LON 33369924 37339813 37459637 36129668 33309763 33369924
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:03 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Rawlins | 5 hr |
| May 16, 7:31 PM CDT | Mesoscale Discussion | SPC | Brown, Clay, Cloud, Dickinson, Ellis, Ellsworth and 24 more | 59 min |
| May 16, 9:43 PM CDT | Mesoscale Discussion | SPC | Brown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 26 more | 62 min |
| May 16, 10:07 PM CDT | Severe Thunderstorm Watch | SPC | Barber, Cowley, Harper, Sumner | 6 hr |
| May 16, 10:45 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Butler, Chase, Comanche, Dickinson, Edwards and 17 more | 5 hr |
| May 17, 1:49 AM CDT | Mesoscale Discussion | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Geary and 4 more | 56 min |
| May 17, 11:39 AM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Nemaha | 66 min |
| May 17, 12:08 PM CDT | Tornado Watch | SPC | Atchison, Brown, Cloud, Doniphan, Douglas, Jackson and 10 more | 7 hr |
| May 17, 2:25 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Geary, Jackson, Jefferson and 7 more | 65 min |
| May 16, 7:29 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Custer and 9 more | 61 min |
| May 16, 7:29 PM CDT | Severe Thunderstorm Watch | SPC | Borden, Brown, Callahan, Coke, Coleman, Concho and 35 more | 8 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Kansas, 2017Every mesoscale discussion in 2017
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.