Alert archive / Texas / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 131, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 12, 2015, 5:42 PM CDT for Polk County, San Jacinto County, Texas. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2015, 5:42 PM CDT (22:42 UTC)
- Expired
- Aug 12, 2015, 6:30 PM CDT
- In force
- 48 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Polk County, TX, San Jacinto County, TX
The radar
The Houston radar (KHGX), 135 km from the middle of the area, began a volume at 22:43 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.7 hours before the alert went out and 184 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
- 206 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1201 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 6:53 PM CDT, 22 hours 49 minutes earlier.
Area forecast discussion, Aug 11, 6:53 PM CDT, 22 hours 49 minutes before
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</html>The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:24 PM CDT | Special Weather Statement | HGX | Grimes | 66 min |
| Aug 11, 7:24 PM CDT | Severe Thunderstorm Warning | HGX | Polk, San Jacinto | 51 min |
| Aug 11, 7:50 PM CDT | Severe Thunderstorm Warning | HGX | Jackson, Matagorda, Wharton | 55 min |
| Aug 11, 8:44 PM CDT | Special Weather Statement | HGX | Montgomery | 61 min |
| Aug 12, 3:35 AM CDT | Heat Advisory | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 17 hr |
| Aug 12, 4:46 PM CDT | Special Weather Statement | HGX | Waller | 44 min |
| Aug 12, 6:07 PM CDT | Special Weather Statement | HGX | Walker | 23 min |
| Aug 12, 6:39 PM CDT | Special Weather Statement | HGX | San Jacinto | 51 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015
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.