Alert archive / Kansas / Mesoscale Discussions in 2009
Mesoscale Discussion 481
The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2009, 11:20 AM CDT for 33 counties in Kansas; 19 counties in Oklahoma; 14 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 16, 2009, 11:20 AM CDT (16:20 UTC)
- Expired
- Apr 16, 2009, 1:15 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 66 counties
Clark County, KS, Comanche County, KS, Edwards County, KS, Finney County, KS, Ford County, KS, Gove County, KS, Graham County, KS, Grant County, KS, Gray County, KS, Greeley County, KS, Hamilton County, KS, Haskell County, KS, Hodgeman County, KS, Kearny County, KS, Kiowa County, KS, Lane County, KS, Logan County, KS, Meade County, KS, Morton County, KS, Ness County, KS, Pawnee County, KS, Rawlins County, KS, Rush County, KS, Scott County, KS, Seward County, KS, Sheridan County, KS, Sherman County, KS, Stanton County, KS, Stevens County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Wichita County, KS, Beaver County, OK, Beckham County, OK, Caddo County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Texas County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Collingsworth County, TX, Gray County, TX, Hansford County, TX, Hardeman County, TX, Hemphill County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Amarillo radar (KAMA), 172 km from the middle of the area, began a volume at 16:20 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 4.3 hours before the alert went out and 172 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
- 525 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 320 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 16, 3:22 PM CDT | Severe Thunderstorm Watch | SPC | Greeley, Hamilton, Morton, Stanton, Wallace | 5 hr |
| Apr 16, 6:01 PM CDT | Mesoscale Discussion | SPC | Greeley, Hamilton, Morton, Stanton, Wallace | 59 min |
| Apr 16, 1:41 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 64 min |
| Apr 16, 2:42 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Texas | 7 hr |
| Apr 16, 5:56 PM CDT | Mesoscale Discussion | SPC | Harmon | 94 min |
| Apr 16, 6:33 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 87 min |
| Apr 16, 3:53 PM CDT | Mesoscale Discussion | SPC | Borden, Briscoe, Crosby, Dawson, Dickens, Fisher and 11 more | 67 min |
| Apr 16, 4:42 PM CDT | Tornado Watch | SPC | Andrews, Borden, Briscoe, Castro, Childress, Coke and 34 more | 7 hr |
Nearby
Mesoscale Discussions in Kansas, 2009Mesoscale Discussions in Oklahoma, 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.