Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 991
The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2009, 3:18 PM CDT for 5 counties in Oklahoma; 34 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 2009, 3:18 PM CDT (20:18 UTC)
- Expired
- Jun 8, 2009, 4:15 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 39 counties
Carter County, OK, Cotton County, OK, Jefferson County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Borden County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Dickens County, TX, Eastland County, TX, Fisher County, TX, Foard County, TX, Glasscock County, TX, Haskell County, TX, Howard County, TX, Jack County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Mitchell County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 71 km from the middle of the area, began a volume at 20:16 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
Midland Regional, TX (KMAF), launched 12:00Z, 8.3 hours before the alert went out and 304 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
- 1292 J/kg
- Mixed-layer CIN
- -258 J/kg
- Mixed-layer LCL
- 1882 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
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 7, 7:08 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Woods | 67 min |
| Jun 8, 3:25 AM CDT | Mesoscale Discussion | SPC | Nowata, Osage, Pawnee, Payne, Washington | 65 min |
| Jun 8, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | Comanche, Cotton, Jackson, Jefferson, Stephens, Tillman | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Oklahoma, 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.