Alert archive / Texas / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 447
The Storm Prediction Center issued this severe thunderstorm watch at Jul 26, 2013, 3:37 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2013, 3:37 PM CDT (20:37 UTC)
- Expired
- Jul 26, 2013, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 52 counties
Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Bryan County, OK, Marshall County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 165 km from the middle of the area, began a volume at 20:37 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:05 PM CDT | Severe Thunderstorm Warning | FWD | Dallas, Ellis, Kaufman | 55 min |
| Jul 26, 6:43 PM CDT | Severe Thunderstorm Warning | FWD | Kaufman, Van Zandt | 62 min |
| Jul 26, 7:06 PM CDT | Severe Thunderstorm Warning | FWD | Navarro | 54 min |
| Jul 26, 7:55 PM CDT | Severe Thunderstorm Warning | FWD | Freestone, Limestone, Navarro | 65 min |
| Jul 26, 8:30 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Howard, Lafayette, Little River, Miller | 45 min |
| Jul 26, 8:47 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Lafayette, Nevada | 43 min |
| Jul 26, 9:16 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Hempstead, Lafayette, Miller, Nevada | 44 min |
| Jul 26, 10:28 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 47 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Shreveport, LA (KBAD), launched 12:00Z, 8.6 hours before the alert went out and 175 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
- 1878 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:51 PM CDT | Mesoscale Discussion | SPC | Lafayette, Miller | 84 min |
| Jul 26, 5:35 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Bienville, Caldwell, Catahoula, Concordia, East Baton Rouge and 20 more | 2 hr |
| Jul 25, 11:02 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 24 more | 88 min |
| Jul 26, 2:07 PM CDT | Mesoscale Discussion | SPC | Bryan, Johnston, Marshall | 113 min |
| Jul 26, 4:51 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Coleman, Comanche, Concho, Coryell and 13 more | 114 min |
Nearby
Severe Thunderstorm Watches in Texas, 2013Severe Thunderstorm Watches in Louisiana, 2013Severe Thunderstorm Watches in Arkansas, 2013Every severe thunderstorm watch in 2013
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.