Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 2271
The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2009, 1:03 PM CST for Choctaw County, Oklahoma; 45 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Dec 23, 2009, 1:03 PM CST (19:03 UTC)
- Expired
- Dec 23, 2009, 2:00 PM CST
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 46 counties
Choctaw County, OK, Anderson County, TX, Angelina County, TX, Austin County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Cherokee County, TX, Delta County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, San Jacinto County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 177 km from the middle of the area, began a volume at 19:05 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
Shreveport, LA (KSHV), launched 12:00Z, 7.1 hours before the alert went out and 202 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
- 12 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 377 m²/s²
- 0-3 km storm-relative helicity
- 435 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Dec 23, 2:37 AM CST | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 26 more | 2 hr |
| Dec 23, 10:31 AM CST | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Creek, Delaware, Haskell and 15 more | 89 min |
| Dec 23, 12:18 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Creek and 17 more | 57 min |
| Dec 23, 1:59 PM CST | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Latimer, McCurtain, Pittsburg and 1 more | 7 hr |
| Dec 23, 3:00 PM CST | Mesoscale Discussion | SPC | Bosque, Comanche, Cooke, Dallas, Denton, Erath and 8 more | 60 min |
| Dec 23, 5:21 PM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 32 more | 114 min |
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.