Alert archive / Texas / Mesoscale Discussions in 2013
Mesoscale Discussion 170
The Storm Prediction Center issued this mesoscale discussion at Feb 18, 2013, 5:06 PM CST for Sabine Parish, Louisiana; 25 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Feb 18, 2013, 5:06 PM CST (23:06 UTC)
- Expired
- Feb 18, 2013, 6:30 PM CST
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 26 counties
Sabine Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Grimes County, TX, Houston County, TX, Jasper County, TX, Lee County, TX, Leon County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Polk County, TX, Robertson County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Washington County, TX
The radar
The Ft Hood radar (KGRK), 174 km from the middle of the area, began a volume at 23:08 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
Shreveport, LA (KSHV), launched 12:00Z, 11.1 hours before the alert went out and 239 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 668 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 510 m²/s²
- 0-3 km storm-relative helicity
- 670 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Feb 18, 1:29 PM CST | Mesoscale Discussion | SPC | Bossier, Caddo, De Soto, Webster | 2 hr |
| Feb 18, 2:08 PM CST | Mesoscale Discussion | SPC | Beauregard, De Soto, Natchitoches, Red River, Sabine, Vernon | 67 min |
| Feb 18, 2:19 PM CST | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 2 more | 7 hr |
| Feb 18, 3:52 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 1 more | 83 min |
| Feb 18, 5:59 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more | 91 min |
Nearby
Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Louisiana, 2013Every mesoscale discussion 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.