Alert archive / Texas / Tornado Warnings in 2021
Tornado Warning 11, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at May 11, 2021, 4:44 PM CDT for Houston County, Polk County, Trinity County, Texas. It was in force for 46 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
- May 11, 2021, 4:44 PM CDT (21:44 UTC)
- Expired
- May 11, 2021, 5:30 PM CDT
- In force
- 46 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Houston County, TX, Polk County, TX, Trinity County, TX
The radar
The Shreveport radar (KSHV), 172 km from the middle of the area, began a volume at 21:47 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 |
|---|---|---|---|
| May 11, 3:04 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 9.7 hours before the alert went out and 179 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 605 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 438 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.4
The text
As transmitted.
143
WFUS54 KHGX 112144
TORHGX
TXC225-373-455-112230-
/O.NEW.KHGX.TO.W.0011.210511T2144Z-210511T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Houston/Galveston TX
444 PM CDT Tue May 11 2021
The National Weather Service in League City has issued a
* Tornado Warning for...
Northeastern Trinity County in southeastern Texas...
East central Houston County in southeastern Texas...
North central Polk County in southeastern Texas...
* Until 530 PM CDT.
* At 442 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles south of Kennard, or 14 miles west of Apple
Springs, moving east at 25 mph.
HAZARD...Tornado and quarter size hail.
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...
Apple Springs around 520 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Centralia and Pennington.
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 3129 9489 3128 9488 3126 9490 3125 9487
3123 9486 3121 9486 3118 9485 3116 9485
3115 9486 3114 9484 3104 9485 3111 9530
3129 9529 3131 9490
TIME...MOT...LOC 2142Z 273DEG 20KT 3120 9521
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$1 follow-up statement
355
WWUS54 KHGX 112159
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
459 PM CDT Tue May 11 2021
TXC225-112208-
/O.CAN.KHGX.TO.W.0011.000000T0000Z-210511T2230Z/
Houston TX-
459 PM CDT Tue May 11 2021
...THE TORNADO WARNING FOR EAST CENTRAL HOUSTON COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved east
out of the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Texas.
LAT...LON 3129 9489 3128 9488 3126 9490 3125 9487
3123 9486 3121 9486 3118 9485 3116 9485
3115 9486 3114 9484 3105 9485 3115 9520
3124 9516 3131 9490
TIME...MOT...LOC 2158Z 273DEG 20KT 3120 9510
$$
TXC373-455-112230-
/O.CON.KHGX.TO.W.0011.000000T0000Z-210511T2230Z/
Trinity TX-Polk TX-
459 PM CDT Tue May 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
NORTHEASTERN TRINITY AND NORTH CENTRAL POLK COUNTIES...
At 458 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles west of Apple Springs, moving east at 25 mph.
HAZARD...Tornado and quarter size hail.
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...
Apple Springs around 520 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Centralia.
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 3129 9489 3128 9488 3126 9490 3125 9487
3123 9486 3121 9486 3118 9485 3116 9485
3115 9486 3114 9484 3105 9485 3115 9520
3124 9516 3131 9490
TIME...MOT...LOC 2158Z 273DEG 20KT 3120 9510
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 3:27 AM CDT | Flash Flood Watch | HGX | Brazos, Grimes, Houston, Madison, Montgomery, Polk and 3 more | 24 hr |
| May 11, 6:28 AM CDT | Areal Flood Advisory | HGX | Polk | 3 hr |
| May 11, 6:46 AM CDT | Special Weather Statement | HGX | Polk | 44 min |
| May 11, 7:25 AM CDT | Severe Thunderstorm Warning | HGX | Polk | 35 min |
| May 11, 8:34 AM CDT | Areal Flood Advisory | HGX | Polk | 3 hr |
| May 11, 10:03 AM CDT | Small Craft Advisory | HGX | 3 hr | |
| May 11, 11:05 AM CDT | Special Weather Statement | HGX | Houston | 10 min |
| May 11, 1:09 PM CDT | Special Weather Statement | HGX | Madison | 36 min |
| May 11, 1:21 PM CDT | Special Weather Statement | HGX | Brazos | 39 min |
| May 11, 1:28 PM CDT | Tornado Warning | HGX | Houston, Madison, Walker | 32 min |
| May 11, 1:57 PM CDT | Tornado Warning | HGX | Houston, Madison, Walker | 18 min |
| May 11, 2:20 PM CDT | Tornado Warning | HGX | Houston, Trinity, Walker | 25 min |
| May 11, 2:41 PM CDT | Severe Thunderstorm Warning | HGX | Houston | 64 min |
| May 11, 3:09 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 52 min |
| May 11, 3:31 PM CDT | Severe Thunderstorm Warning | HGX | Houston | 44 min |
| May 11, 3:53 PM CDT | Severe Thunderstorm Warning | HGX | Houston | 37 min |
| May 11, 4:10 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Grimes | 35 min |
| May 11, 4:14 PM CDT | Tornado Warning | HGX | Houston, Trinity | 31 min |
| May 11, 4:27 PM CDT | Tornado Warning | HGX | Houston, Trinity, Walker | 33 min |
| May 11, 4:54 PM CDT | Severe Thunderstorm Warning | HGX | Polk, San Jacinto, Trinity | 51 min |
| May 11, 5:22 PM CDT | Special Weather Statement | HGX | Montgomery, Waller | 38 min |
| May 11, 5:34 PM CDT | Areal Flood Advisory | HGX | Houston, Madison | 116 min |
| May 11, 5:41 PM CDT | Severe Thunderstorm Warning | HGX | Liberty, Polk, San Jacinto, Trinity | 64 min |
| May 11, 5:49 PM CDT | Areal Flood Advisory | HGX | Houston, San Jacinto, Trinity, Walker | 116 min |
| May 11, 6:18 PM CDT | Severe Thunderstorm Warning | HGX | Liberty | 42 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.