Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 2137
The Storm Prediction Center issued this mesoscale discussion at Oct 25, 2009, 9:44 PM CDT for 9 counties in Oklahoma; 30 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Oct 25, 2009, 9:44 PM CDT (02:44 UTC)
- Expired
- Oct 25, 2009, 11:15 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 39 counties
Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Johnston County, OK, Latimer County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Bosque County, TX, Brown County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, McLennan County, TX, Mills County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 76 km from the middle of the area, began a volume at 02:45 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
Fort Worth, TX (KFWD), launched 00:00Z, 2.7 hours before the alert went out and 52 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
- 2288 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1025 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 8.4
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 |
|---|---|---|---|---|
| Oct 25, 7:13 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 6 more | 6 hr |
| Oct 25, 11:40 PM CDT | Mesoscale Discussion | SPC | Choctaw, LeFlore, McCurtain, Pushmataha | 95 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.