Alert archive / Oklahoma / Mesoscale Discussions in 2024
Mesoscale Discussion 577
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2024, 3:24 PM CDT for 15 counties in Oklahoma; 6 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2024, 3:24 PM CDT (20:24 UTC)
- Expired
- Apr 30, 2024, 6:00 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 21 counties
Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Washita County, OK, Woods County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, King County, TX
The radar
The Altus AFB radar (KFDR), 105 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 163 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
- 130 J/kg
- Mixed-layer CIN
- -253 J/kg
- Mixed-layer LCL
- 1493 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
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 30, 4:38 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Custer and 14 more | 6 hr |
| Apr 30, 6:47 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Comanche, Garfield, Grant and 7 more | 58 min |
| Apr 30, 5:14 PM CDT | Mesoscale Discussion | SPC | Crockett, Glasscock, Howard, Irion, Midland, Reagan and 3 more | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2024Mesoscale Discussions in Texas, 2024Every mesoscale discussion in 2024
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.