Alert archive / Texas / Tornado Warnings in 2021
Tornado Warning 22, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at Jul 12, 2021, 1:21 PM CDT for Montgomery County, Walker 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
- Jul 12, 2021, 1:21 PM CDT (18:21 UTC)
- Expired
- Jul 12, 2021, 1:33 PM CDT
- In force
- 12 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Montgomery County, TX, Walker County, TX
The radar
The Houston radar (KHGX), 139 km from the middle of the area, began a volume at 18:21 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, 6.4 hours before the alert went out and 245 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
- 2909 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 749 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
906
WFUS54 KHGX 121821
TORHGX
TXC339-471-121845-
/O.NEW.KHGX.TO.W.0022.210712T1821Z-210712T1845Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Houston/Galveston TX
121 PM CDT Mon Jul 12 2021
The National Weather Service in League City has issued a
* Tornado Warning for...
Northwestern Montgomery County in southeastern Texas...
Southwestern Walker County in southeastern Texas...
* Until 145 PM CDT.
* At 120 PM CDT, a severe thunderstorm capable of producing a tornado
was located 13 miles west of Huntsville State Park, or 14 miles
southwest of Huntsville, moving east at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Huntsville and Huntsville State Park around 145 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3056 9579 3062 9581 3071 9554 3059 9550
TIME...MOT...LOC 1820Z 254DEG 25KT 3060 9575
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Cady1 follow-up statement
140
WWUS54 KHGX 121833
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
133 PM CDT Mon Jul 12 2021
TXC339-471-121842-
/O.CAN.KHGX.TO.W.0022.000000T0000Z-210712T1845Z/
Montgomery TX-Walker TX-
133 PM CDT Mon Jul 12 2021
...THE TORNADO WARNING FOR NORTHWESTERN MONTGOMERY AND SOUTHWESTERN
WALKER COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled. However gusty winds are
still possible with this thunderstorm.
LAT...LON 3056 9579 3062 9581 3071 9554 3059 9550
TIME...MOT...LOC 1832Z 254DEG 25KT 3062 9565
$$
CadyThe office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 7:21 PM CDT | Special Weather Statement | HGX | Houston | 39 min |
| Jul 11, 7:39 PM CDT | Special Weather Statement | HGX | Houston | 51 min |
| Jul 11, 7:58 PM CDT | Special Weather Statement | HGX | Houston | 47 min |
| Jul 12, 8:29 AM CDT | Areal Flood Advisory | HGX | Brazos, Madison | 3 hr |
| Jul 12, 9:03 AM CDT | Areal Flood Advisory | HGX | Walker | 117 min |
| Jul 12, 9:08 AM CDT | Special Weather Statement | HGX | San Jacinto | 37 min |
| Jul 12, 9:36 AM CDT | Special Weather Statement | HGX | San Jacinto | 39 min |
| Jul 12, 10:12 AM CDT | Special Weather Statement | HGX | Liberty, Polk, San Jacinto | 48 min |
| Jul 12, 11:29 AM CDT | Areal Flood Advisory | HGX | Brazos, Madison | 3 hr |
| Jul 12, 11:33 AM CDT | Areal Flood Advisory | HGX | Houston | 3 hr |
| Jul 12, 12:01 PM CDT | Special Weather Statement | HGX | Brazos | 59 min |
| Jul 12, 12:43 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 18 min |
| Jul 12, 1:10 PM CDT | Areal Flood Advisory | HGX | Brazos, Grimes | 110 min |
| Jul 12, 2:34 PM CDT | Special Weather Statement | HGX | Montgomery, San Jacinto, Waller | 41 min |
| Jul 12, 3:06 PM CDT | Special Weather Statement | HGX | Harris | 39 min |
| Jul 12, 3:43 PM CDT | Special Weather Statement | HGX | Fort Bend, Harris | 47 min |
| Jul 12, 4:31 PM CDT | Special Weather Statement | HGX | Chambers, Fort Bend | 59 min |
Nearby
Tornado Warnings in Texas, 2021Every tornado warning in 2021Tornadoes 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.