Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1822
The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2021, 4:25 PM CDT for 6 counties in Oklahoma; Wichita County, Texas. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2021, 4:25 PM CDT (21:25 UTC)
- Expired
- Oct 10, 2021, 6:00 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 517
Counties Comanche County, OK, Cotton County, OK, Grady County, OK, McClain County, OK, Stephens County, OK, Tillman County, OK, Wichita County, TX
The radar
The Altus AFB radar (KFDR), 60 km from the middle of the area, began a volume at 21:26 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, 9.4 hours before the alert went out and 121 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.
907
ACUS11 KWNS 102125
SWOMCD
SPC MCD 102125
OKZ000-TXZ000-102300-
Mesoscale Discussion 1822
NWS Storm Prediction Center Norman OK
0425 PM CDT Sun Oct 10 2021
Areas affected...Southwest Oklahoma into western North Texas
Concerning...Tornado Watch 517...
Valid 102125Z - 102300Z
The severe weather threat for Tornado Watch 517 continues.
SUMMARY...Initiation of discrete storms is becoming more likely in
the vicinity of Frederick, OK within the next 1-1.5 hours. The
threat for tornadoes is increasing in southwest Oklahoma into parts
of central Oklahoma.
DISCUSSION...Towering cumulus continues to develop south of
Frederick, OK. The strongest pressure falls in the last few hours
have occurred in this vicinity. Confidence is increasing in storm
initiation within the next 1-1.5 hours. Given the backed surface
winds and over 50 kts of effective shear, initial storm mode will
likely be supercellular. KFDR VWP has begun to show an increase in
low-level SRH recently as well. Storms that form in this region
would pose the greatest tornado risk over the next few hours.
..Wendt.. 10/10/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...
LAT...LON 33819849 33849879 33949902 34059910 34529892 34989844
35259790 35289751 35069737 34389761 33819849SPC 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, 6:13 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Coal, Hughes, Johnston, Marshall and 1 more | 8 hr |
| Oct 10, 6:32 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Grady, Lincoln and 5 more | 118 min |
| Oct 10, 3:46 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Coleman, Eastland, Jack and 6 more | 119 min |
Nearby
Mesoscale Discussions in Oklahoma, 2021Mesoscale Discussions in Texas, 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.