Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 22, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 23, 2021, 1:55 AM CDT for 4 counties in Texas. It was in force for 35 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
- Mar 23, 2021, 1:55 AM CDT (06:55 UTC)
- Expired
- Mar 23, 2021, 2:30 AM CDT
- In force
- 35 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX
The radar
The Houston radar (KHGX), 167 km from the middle of the area, began a volume at 06:59 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 |
|---|---|---|---|
| Mar 22, 11:10 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.9 hours before the alert went out and 222 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
- 82 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 715 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 405 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
841
WUUS54 KHGX 230655
SVRHGX
TXC373-407-455-471-230730-
/O.NEW.KHGX.SV.W.0022.210323T0655Z-210323T0730Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
155 AM CDT Tue Mar 23 2021
The National Weather Service in League City has issued a
* Severe Thunderstorm Warning for...
Trinity County in southeastern Texas...
Northwestern San Jacinto County in southeastern Texas...
Northwestern Polk County in southeastern Texas...
Northeastern Walker County in southeastern Texas...
* Until 230 AM CDT.
* At 155 AM CDT, a severe thunderstorm was located near Trinity, or
17 miles north of Huntsville, moving east at 50 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Trinity, Groveton, Riverside and Sebastopol.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3088 9489 3077 9560 3085 9561 3095 9553
3100 9552 3110 9537 3124 9505
TIME...MOT...LOC 0655Z 253DEG 42KT 3095 9547
HAIL...0.75IN
WIND...60MPH
$$2 follow-up statements
235
WWUS54 KHGX 230711
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
211 AM CDT Tue Mar 23 2021
TXC373-407-455-471-230730-
/O.CON.KHGX.SV.W.0022.000000T0000Z-210323T0730Z/
Trinity TX-San Jacinto TX-Polk TX-Walker TX-
211 AM CDT Tue Mar 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR SOUTHERN TRINITY...NORTHWESTERN SAN JACINTO...NORTHWESTERN POLK
AND NORTHEASTERN WALKER COUNTIES...
At 211 AM CDT, a severe thunderstorm was located over Sebastopol, or
24 miles northeast of Huntsville, moving east at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Trinity, Groveton, Riverside and Sebastopol.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3080 9543 3096 9536 3104 9531 3117 9502
3088 9489
TIME...MOT...LOC 0711Z 261DEG 34KT 3094 9525
HAIL...0.75IN
WIND...60MPH
$$354
WWUS54 KHGX 230721
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
221 AM CDT Tue Mar 23 2021
TXC407-471-230731-
/O.CAN.KHGX.SV.W.0022.000000T0000Z-210323T0730Z/
San Jacinto TX-Walker TX-
221 AM CDT Tue Mar 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SAN JACINTO AND
NORTHEASTERN WALKER COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
southeastern Texas.
LAT...LON 3088 9489 3083 9522 3084 9523 3097 9520
3104 9518 3109 9498
TIME...MOT...LOC 0721Z 253DEG 42KT 3097 9512
$$
TXC373-455-230730-
/O.CON.KHGX.SV.W.0022.000000T0000Z-210323T0730Z/
Trinity TX-Polk TX-
221 AM CDT Tue Mar 23 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR SOUTHEASTERN TRINITY AND NORTHWESTERN POLK COUNTIES...
At 221 AM CDT, a severe thunderstorm was located near Groveton, or 19
miles southwest of Apple Springs, moving east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Groveton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3088 9489 3083 9522 3084 9523 3097 9520
3104 9518 3109 9498
TIME...MOT...LOC 0721Z 253DEG 42KT 3097 9512
HAIL...1.00IN
WIND...60MPH
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 11:18 PM CDT | Special Weather Statement | HGX | Brazos, Burleson, Madison | 87 min |
| Mar 22, 11:57 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 48 min |
| Mar 23, 12:30 AM CDT | Small Craft Advisory | HGX | 4 hr | |
| Mar 23, 12:43 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Madison | 47 min |
| Mar 23, 1:16 AM CDT | Special Weather Statement | HGX | Burleson, Grimes, Washington | 44 min |
| Mar 23, 1:19 AM CDT | Severe Thunderstorm Warning | HGX | Grimes, Houston, Madison, Trinity, Walker | 41 min |
| Mar 23, 2:29 AM CDT | Severe Thunderstorm Warning | HGX | Polk, Trinity | 31 min |
| Mar 23, 3:16 AM CDT | Severe Thunderstorm Warning | HGX | Colorado | 26 min |
| Mar 23, 3:20 AM CDT | Special Weather Statement | HGX | Austin | 40 min |
| Mar 23, 3:44 AM CDT | Special Weather Statement | HGX | Colorado | 31 min |
| Mar 23, 4:06 AM CDT | Special Weather Statement | HGX | Fort Bend, Waller, Wharton | 54 min |
| Mar 23, 4:28 AM CDT | Special Weather Statement | HGX | Polk | 62 min |
| Mar 23, 5:50 AM CDT | Special Weather Statement | HGX | Brazoria | 55 min |
| Mar 23, 6:02 AM CDT | Special Weather Statement | HGX | Galveston | 43 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.