Alert archive / Oklahoma / Mesoscale Discussions in 2020
Mesoscale Discussion 431
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2020, 9:10 PM CDT for 30 counties in Oklahoma. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2020, 9:10 PM CDT (02:10 UTC)
- Expired
- Apr 21, 2020, 10:45 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 30 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Washita County, OK
The radar
The Altus AFB radar (KFDR), 129 km from the middle of the area, began a volume at 02:12 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 00:00Z, 2.2 hours before the alert went out and 126 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
- 46 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 2104 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 279 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 11:32 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more | 88 min |
| Apr 22, 1:21 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more | 84 min |
| Apr 22, 1:46 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Garvin, Johnston and 6 more | 4 hr |
| Apr 22, 2:16 AM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper, Texas, Woods, Woodward | 119 min |
| Apr 22, 8:36 AM CDT | Mesoscale Discussion | SPC | Atoka, Blaine, Caddo, Canadian, Carter, Cleveland and 26 more | 84 min |
| Apr 22, 8:53 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Caddo, Canadian, Carter and 46 more | 6 hr |
| Apr 22, 11:29 AM CDT | Mesoscale Discussion | SPC | Atoka, Coal, Haskell, Hughes, Latimer, LeFlore and 5 more | 91 min |
| Apr 22, 1:12 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more | 63 min |
| Apr 22, 2:33 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more | 6 hr |
| Apr 22, 4:43 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Coal, Garvin, Johnston, Marshall and 2 more | 62 min |
| Apr 22, 6:39 PM CDT | Mesoscale Discussion | SPC | McCurtain | 66 min |
Nearby
Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020
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.