Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 569
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2009, 6:38 PM CDT for 21 counties in Kansas; 24 counties in Oklahoma; 5 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2009, 6:38 PM CDT (23:38 UTC)
- Expired
- Apr 25, 2009, 8:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Allen County, KS, Anderson County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Coffey County, KS, Cowley County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Greenwood County, KS, Harper County, KS, Labette County, KS, Lyon County, KS, Montgomery County, KS, Neosho County, KS, Osage County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Hemphill County, TX, Lipscomb County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 75 km from the middle of the area, began a volume at 23:38 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, 11.6 hours before the alert went out and 109 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
- 777 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 294 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 1:23 PM CDT | Mesoscale Discussion | SPC | Harper, Sedgwick, Sumner | 3 hr |
| Apr 25, 3:36 PM CDT | Tornado Watch | SPC | Allen, Anderson, Barber, Butler, Chase, Chautauqua and 24 more | 7 hr |
| Apr 25, 3:49 PM CDT | Mesoscale Discussion | SPC | Harper, Sedgwick, Sumner | 116 min |
| Apr 25, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | Atchison, Doniphan, Johnson, Leavenworth, Miami, Wyandotte | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Kansas, 2009Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009
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.