Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 75, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jul 21, 2021, 1:39 PM CDT for Brazoria County, Galveston County, Harris County, Texas. It was in force for 32 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 21, 2021, 1:39 PM CDT (18:39 UTC)
- Expired
- Jul 21, 2021, 2:11 PM CDT
- In force
- 32 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Brazoria County, TX, Galveston County, TX, Harris County, TX
The radar
The Houston radar (KHGX), 16 km from the middle of the area, began a volume at 18:43 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, 6.7 hours before the alert went out and 209 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
- 539 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
406
WUUS54 KHGX 211839
SVRHGX
TXC039-167-201-211930-
/O.NEW.KHGX.SV.W.0075.210721T1839Z-210721T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
139 PM CDT Wed Jul 21 2021
The National Weather Service in League City has issued a
* Severe Thunderstorm Warning for...
West central Galveston County in southeastern Texas...
Northeastern Brazoria County in southeastern Texas...
South central Harris County in southeastern Texas...
* Until 230 PM CDT.
* At 138 PM CDT, a severe thunderstorm was located over southwestern
Friendswood, moving west at 10 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Pearland, southwestern League City, Friendswood, Alvin, Santa Fe,
Webster, Manvel, Greater Hobby Area, southwestern South Belt /
Ellington, southwestern Clear Lake, Brookside Village, Iowa Colony,
Hillcrest and Minnetex.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Heavy rainfall is occurring with this storm, and may lead to
localized street flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 2954 9511 2938 9516 2937 9540 2951 9539
2963 9531
TIME...MOT...LOC 1838Z 102DEG 11KT 2949 9523
HAIL...0.88IN
WIND...60MPH
$$1 follow-up statement
642
WWUS54 KHGX 211911
SVSHGX
Severe Weather Statement
National Weather Service Houston/Galveston TX
211 PM CDT Wed Jul 21 2021
TXC039-167-201-211919-
/O.CAN.KHGX.SV.W.0075.000000T0000Z-210721T1930Z/
Galveston TX-Brazoria TX-Harris TX-
211 PM CDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GALVESTON...
NORTHEASTERN BRAZORIA AND SOUTH CENTRAL HARRIS COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However heavy rain and
gusty winds are still possible with new thunderstorms that may pop
up in the vicinity.
LAT...LON 2954 9511 2938 9516 2937 9540 2951 9539
2963 9531
TIME...MOT...LOC 1908Z 102DEG 11KT 2951 9534
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:46 PM CDT | River Flood Warning | HGX | Brazoria, Fort Bend, Wharton | 35 hr |
| Jul 21, 1:06 PM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Harris | 114 min |
| Jul 21, 1:17 PM CDT | Special Weather Statement | HGX | Fort Bend | 43 min |
| Jul 21, 1:33 PM CDT | Special Weather Statement | HGX | Brazoria | 57 min |
| Jul 21, 1:46 PM CDT | Areal Flood Advisory | HGX | Brazoria, Galveston, Harris | 74 min |
| Jul 21, 2:34 PM CDT | Areal Flood Advisory | HGX | Harris | 116 min |
| Jul 21, 2:34 PM CDT | Special Weather Statement | HGX | Harris | 26 min |
| Jul 21, 3:09 PM CDT | Flash Flood Warning | HGX | Harris | 51 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.