Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 565
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2009, 3:49 PM CDT for Harper County, Sedgwick County, Sumner County, Kansas; 22 counties in Oklahoma; 7 counties in Texas. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2009, 3:49 PM CDT (20:49 UTC)
- Expired
- Apr 25, 2009, 5:45 PM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
All 32 counties
Harper County, KS, Sedgwick County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche 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, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Childress County, TX, Collingsworth County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Wheeler County, TX
The radar
The Altus AFB radar (KFDR), 130 km from the middle of the area, began a volume at 20:51 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, 8.8 hours before the alert went out and 160 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, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | Atchison, Doniphan, Johnson, Leavenworth, Miami, Wyandotte | 6 hr |
| Apr 25, 6:38 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Butler, Chase, Chautauqua, Coffey and 15 more | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Kansas, 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.