Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 33, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 23, 2021, 6:27 PM CDT for Liberty County, Polk County, Texas. It was in force for 18 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
- Apr 23, 2021, 6:27 PM CDT (23:27 UTC)
- Expired
- Apr 23, 2021, 6:45 PM CDT
- In force
- 18 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Liberty County, TX, Polk County, TX
The radar
The Houston radar (KHGX), 125 km from the middle of the area, began a volume at 23:27 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 23, 2:00 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.5 hours before the alert went out and 151 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
- 12 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 373 m²/s²
- 0-3 km storm-relative helicity
- 419 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
335
WUUS54 KHGX 232327
SVRHGX
TXC291-373-232345-
/O.NEW.KHGX.SV.W.0033.210423T2327Z-210423T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
627 PM CDT Fri Apr 23 2021
The National Weather Service in League City has issued a
* Severe Thunderstorm Warning for...
Northern Liberty County in southeastern Texas...
Southeastern Polk County in southeastern Texas...
* Until 645 PM CDT.
* At 627 PM CDT, a severe thunderstorm was located 9 miles northwest
of Votaw, or 13 miles northwest of Thicket, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Alabama-Coushatta Reservation and Segno.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for southeastern
Texas.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3049 9473 3041 9470 3040 9474 3074 9480
3077 9460 3049 9454
TIME...MOT...LOC 2327Z 256DEG 27KT 3056 9475
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$1 follow-up statement
445
WWUS54 KHGX 232347
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
647 PM CDT Fri Apr 23 2021
TXC291-373-232356-
/O.EXP.KHGX.SV.W.0033.000000T0000Z-210423T2345Z/
Liberty TX-Polk TX-
647 PM CDT Fri Apr 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LIBERTY AND
SOUTHEASTERN POLK COUNTIES HAS EXPIRED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire. However heavy
rain is still possible with the thunderstorms trailing behind it.
A Tornado Watch remains in effect until 900 PM CDT for southeastern
Texas.
LAT...LON 3049 9473 3041 9470 3040 9474 3074 9480
3077 9460 3049 9454
TIME...MOT...LOC 2346Z 256DEG 27KT 3058 9464
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 4:05 AM CDT | Beach Hazards Statement | HGX | Brazoria, Galveston, Matagorda | 23 hr |
| Apr 23, 2:25 PM CDT | Special Weather Statement | HGX | Grimes | 50 min |
| Apr 23, 2:56 PM CDT | Special Weather Statement | HGX | Madison | 49 min |
| Apr 23, 4:35 PM CDT | Special Weather Statement | HGX | Grimes | 40 min |
| Apr 23, 5:00 PM CDT | Areal Flood Advisory | HGX | Brazos, Grimes, Montgomery, Walker | 60 min |
| Apr 23, 5:19 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, Walker | 26 min |
| Apr 23, 5:31 PM CDT | Areal Flood Advisory | HGX | Montgomery, Polk, San Jacinto, Trinity, Walker | 119 min |
| Apr 23, 5:45 PM CDT | Tornado Warning | HGX | Liberty, Montgomery, San Jacinto | 30 min |
| Apr 23, 5:48 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, Polk, San Jacinto, Walker | 27 min |
| Apr 23, 6:09 PM CDT | Tornado Warning | HGX | Liberty, Polk, San Jacinto | 36 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.