Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 1324
The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 3:21 PM CDT for 33 counties in Oklahoma; 21 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2011, 3:21 PM CDT (20:21 UTC)
- Expired
- Jun 20, 2011, 4:45 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 54 counties
Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Archer County, TX, Callahan County, TX, Clay County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hood County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Shackelford County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 99 km from the middle of the area, began a volume at 20:21 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, 8.4 hours before the alert went out and 113 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
- 1692 J/kg
- Mixed-layer CIN
- -552 J/kg
- Mixed-layer LCL
- 1064 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 367 m²/s²
- 0-3 km storm-relative helicity
- 400 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
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 |
|---|---|---|---|---|
| Jun 20, 10:42 AM CDT | Mesoscale Discussion | SPC | Cleveland, Creek, Kay, Lincoln, Logan, McClain and 13 more | 63 min |
| Jun 20, 1:34 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Canadian, Garfield, Grant, Kay, Kingfisher and 7 more | 116 min |
| Jun 20, 3:42 PM CDT | Severe Thunderstorm Watch | SPC | Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 26 more | 7 hr |
| Jun 20, 5:35 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 19 more | 85 min |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.