Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 80, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 18, 2021, 3:32 PM CDT for Houston County, Texas. It was in force for 12 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2021, 3:32 PM CDT (20:32 UTC)
- Expired
- Aug 18, 2021, 3:44 PM CDT
- In force
- 12 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Houston County, TX
The radar
The Shreveport radar (KSHV), 186 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 195 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
- 453 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 995 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
029
WUUS54 KHGX 182032
SVRHGX
TXC225-182115-
/O.NEW.KHGX.SV.W.0080.210818T2032Z-210818T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
332 PM CDT Wed Aug 18 2021
The National Weather Service in League City has issued a
* Severe Thunderstorm Warning for...
Northwestern Houston County in southeastern Texas...
* Until 415 PM CDT.
* At 331 PM CDT, a severe thunderstorm was located near Lovelady, or
7 miles east of Austonio, moving north at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Crockett, Grapeland and Latexo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3152 9523 3120 9533 3132 9562 3155 9560
3156 9552
TIME...MOT...LOC 2031Z 193DEG 28KT 3120 9551
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CB1 follow-up statement
418
WWUS54 KHGX 182044
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
344 PM CDT Wed Aug 18 2021
TXC225-182053-
/O.CAN.KHGX.SV.W.0080.000000T0000Z-210818T2115Z/
Houston TX-
344 PM CDT Wed Aug 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HOUSTON COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 3152 9523 3120 9533 3132 9562 3155 9560
3156 9552
TIME...MOT...LOC 2039Z 193DEG 28KT 3130 9548
$$
CBThe office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:33 PM CDT | Areal Flood Advisory | HGX | Harris | 57 min |
| Aug 18, 1:44 PM CDT | Special Weather Statement | HGX | Montgomery | 46 min |
| Aug 18, 1:54 PM CDT | Special Weather Statement | HGX | Walker | 51 min |
| Aug 18, 2:25 PM CDT | Special Weather Statement | HGX | Brazos, Burleson | 50 min |
| Aug 18, 2:31 PM CDT | Special Weather Statement | HGX | Madison, Walker | 44 min |
| Aug 18, 2:54 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Madison, Trinity, Walker | 51 min |
| Aug 18, 3:46 PM CDT | Special Weather Statement | HGX | Houston | 29 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning in 2021
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.