Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1823
The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2021, 6:32 PM CDT for 11 counties in Oklahoma. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2021, 6:32 PM CDT (23:32 UTC)
- Expired
- Oct 10, 2021, 8:30 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 516
Counties Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Grady County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Pottawatomie County, OK, Seminole County, OK
The radar
The Norman radar (KTLX), 68 km from the middle of the area, began a volume at 23:36 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 nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 55 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
- 8 J/kg
- Mixed-layer CIN
- -777 J/kg
- Mixed-layer LCL
- 1314 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 273 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
916 ACUS11 KWNS 102333 SWOMCD SPC MCD 102332 OKZ000-110130- Mesoscale Discussion 1823 NWS Storm Prediction Center Norman OK 0632 PM CDT Sun Oct 10 2021 Areas affected...Southwestern-Central Oklahoma Concerning...Tornado Watch 516... Valid 102332Z - 110130Z The severe weather threat for Tornado Watch 516 continues. SUMMARY...Severe thunderstorms will race northeast across southwestern into central Oklahoma this evening, likely approaching the southwestern Oklahoma City metro by 01z. Very strong winds and hail are expected, along with tornadoes. DISCUSSION...Leading edge of large-scale forcing for ascent is spreading across western OK/northwestern TX early this evening. Deep convection has finally responded to this forcing and is increasing along the surging cold front, and south along the dry line. Strongest supercell has developed immediately ahead of the surface low over Kiowa County and this storm should mature into a larger cluster as it propagates downstream into Caddo/northern Comanche Counties. Very strong winds could ultimately evolve with this complex if upscale growth continues; although in the short term, very large hail is likely, along with the threat for tornadoes. Leading edge of severe should surge into the western/southwestern portions of the Oklahoma City metro by 01z. ..Darrow.. 10/10/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OUN... LAT...LON 35059884 36139715 35149652 34549866 35059884
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 2:04 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Comanche, Garfield, Grady and 13 more | 116 min |
| Oct 10, 3:22 PM CDT | Tornado Watch | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 33 more | 7 hr |
| Oct 10, 4:25 PM CDT | Mesoscale Discussion | SPC | Comanche, Cotton, Grady, McClain, Stephens, Tillman | 95 min |
| Oct 10, 6:13 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Coal, Hughes, Johnston, Marshall and 1 more | 8 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2021Every mesoscale discussion in 2021
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.