Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 820
The Storm Prediction Center issued this mesoscale discussion at May 13, 2009, 8:22 PM CDT for 4 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2009, 8:22 PM CDT (01:22 UTC)
- Expired
- May 13, 2009, 9:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 95 counties
Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Barry County, MO, Barton County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Cole County, MO, Cooper County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Ozark County, MO, Pettis County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Atoka County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Kiowa County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 16 km from the middle of the area, began a volume at 01:24 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
Springfield, MO (KSGF), launched 00:00Z, 1.4 hours before the alert went out and 162 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
- 1647 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 1622 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 16.0
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 |
|---|---|---|---|---|
| May 13, 9:36 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more | 6 hr |
| May 13, 11:27 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clark, Clay and 44 more | 93 min |
| May 14, 1:01 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Clark, Clay, Craighead, Crittenden, Cross and 23 more | 5 hr |
| May 14, 1:11 AM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 6 hr |
| May 14, 3:56 AM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Mississippi, St. Francis, Woodruff | 64 min |
| May 14, 5:26 AM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller, Union | 64 min |
| May 13, 7:05 PM CDT | Mesoscale Discussion | SPC | Audrain, Clark, Knox, Lewis, Macon, Marion and 5 more | 85 min |
| May 13, 8:35 PM CDT | Mesoscale Discussion | SPC | Clark, Knox, Lewis, Macon, Marion, Monroe and 3 more | 85 min |
| May 13, 9:56 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Camden, Christian, Crawford, Dallas, Dent and 37 more | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Missouri, 2009Mesoscale Discussions in Arkansas, 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.