Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 1743
The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2012, 3:29 PM CDT for 13 counties in Oklahoma; 29 counties in Texas. It was in force for 31 min.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2012, 3:29 PM CDT (20:29 UTC)
- Expired
- Aug 12, 2012, 4:00 PM CDT
- In force
- 31 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 42 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Seminole County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Haskell County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Shackelford County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 145 km from the middle of the area, began a volume at 20:30 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, 8.5 hours before the alert went out and 116 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
- 792 J/kg
- Mixed-layer CIN
- -434 J/kg
- Mixed-layer LCL
- 1708 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 146 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 12, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more | 7 hr |
| Aug 12, 6:06 PM CDT | Mesoscale Discussion | SPC | Bryan, Johnston, Marshall | 54 min |
| Aug 12, 6:28 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Choctaw, Craig, Delaware, Haskell and 15 more | 92 min |
Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012
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.