Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 1918
The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2011, 5:01 PM CDT for 18 counties in Oklahoma; 59 counties in Texas. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2011, 5:01 PM CDT (22:01 UTC)
- Expired
- Aug 9, 2011, 6:00 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 77 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pushmataha County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Armstrong County, TX, Bailey County, TX, Baylor County, TX, Briscoe County, TX, Camp County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Clay County, TX, Cochran County, TX, Collin County, TX, Collingsworth County, TX, Cooke County, TX, Cottle County, TX, Crosby County, TX, Dallas County, TX, Deaf Smith County, TX, Delta County, TX, Denton County, TX, Dickens County, TX, Donley County, TX, Fannin County, TX, Floyd County, TX, Foard County, TX, Franklin County, TX, Gray County, TX, Grayson County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hockley County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Kaufman County, TX, King County, TX, Knox County, TX, Lamar County, TX, Lamb County, TX, Lubbock County, TX, Montague County, TX, Morris County, TX, Motley County, TX, Parker County, TX, Potter County, TX, Rains County, TX, Randall County, TX, Red River County, TX, Rockwall County, TX, Swisher County, TX, Tarrant County, TX, Throckmorton County, TX, Titus County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Wood County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 40 km from the middle of the area, began a volume at 22:01 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
Fort Worth, TX (KFWD), launched 12:00Z, 10.0 hours before the alert went out and 220 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
- 2505 J/kg
- Mixed-layer CIN
- -217 J/kg
- Mixed-layer LCL
- 1211 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Aug 8, 7:34 PM CDT | Mesoscale Discussion | SPC | Adair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 38 more | 116 min |
| Aug 8, 7:53 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Cherokee, Cleveland, Comanche, Cotton, Garvin and 16 more | 7 hr |
| Aug 8, 11:00 PM CDT | Mesoscale Discussion | SPC | Adair, Cleveland, Haskell, Hughes, Latimer, LeFlore and 8 more | 2 hr |
| Aug 9, 2:21 AM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 10 more | 84 min |
| Aug 9, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Texas | 8 hr |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 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.