Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 522
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2009, 8:14 PM CDT for 5 states. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2009, 8:14 PM CDT (01:14 UTC)
- Expired
- Apr 18, 2009, 9:45 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 62 counties
Benton County, AR, Crawford County, AR, Washington County, AR, Chautauqua County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Barry County, MO, Barton County, MO, Dade County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee 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, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Collin County, TX, Cooke County, TX, Denton County, TX, Grayson County, TX, Parker County, TX, Tarrant County, TX, Wise County, TX
The radar
The Tulsa radar (KINX), 81 km from the middle of the area, began a volume at 01:14 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 00:00Z, 1.2 hours before the alert went out and 152 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
- 649 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1405 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.1
- 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 19, 12:14 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Calhoun, Clay, Cleburne, Cleveland and 35 more | 61 min |
| Apr 19, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clay, Cleburne, Cleveland and 26 more | 6 hr |
| Apr 19, 2:22 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clay, Cleveland, Craighead and 25 more | 53 min |
| Apr 19, 3:49 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more | 56 min |
| Apr 18, 7:13 PM CDT | Mesoscale Discussion | SPC | Butler, Cowley, Harvey, McPherson, Marion, Sedgwick and 1 more | 62 min |
| Apr 19, 5:47 PM CDT | Mesoscale Discussion | SPC | Mississippi, New Madrid | 58 min |
Nearby
Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Missouri, 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.