Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 76, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 11, 2021, 3:18 PM CDT for Harris County, Montgomery County, Texas. It was in force for 27 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
- Aug 11, 2021, 3:18 PM CDT (20:18 UTC)
- Expired
- Aug 11, 2021, 3:45 PM CDT
- In force
- 27 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Harris County, TX, Montgomery County, TX
The radar
The Houston radar (KHGX), 70 km from the middle of the area, began a volume at 20:17 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, 8.3 hours before the alert went out and 225 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
- 3222 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -49 m²/s²
- 0-3 km storm-relative helicity
- -42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
455 WUUS54 KHGX 112018 SVRHGX TXC201-339-112045- /O.NEW.KHGX.SV.W.0076.210811T2018Z-210811T2045Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Houston/Galveston TX Issued by National Weather Service Corpus Christi TX 318 PM CDT Wed Aug 11 2021 The National Weather Service in League City has issued a * Severe Thunderstorm Warning for... Southwestern Montgomery County in southeastern Texas... Northwestern Harris County in southeastern Texas... * Until 345 PM CDT. * At 318 PM CDT, a severe thunderstorm was located over Willowbrook, or near Jersey Village, moving northwest at 15 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Tomball, Jersey Village, Greater Greenspoint, Spring Branch North, Hooks Airport, Westbranch, Fairbanks / Northwest Crossing, Langwood, Willowbrook, Cypress, Greater Inwood, Carverdale, Spring Branch Central, Hidden Valley, northwestern Acres Home, Spring Branch East and Central Northwest. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 2996 9538 2981 9549 2993 9579 3015 9562 TIME...MOT...LOC 2018Z 123DEG 13KT 2993 9551 HAIL...1.00IN WIND...<50MPH $$ JCP
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:33 AM CDT | Heat Advisory | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 15 hr |
| Aug 11, 2:30 PM CDT | Special Weather Statement | HGX | Liberty | 45 min |
| Aug 11, 3:04 PM CDT | Special Weather Statement | HGX | Harris | 41 min |
| Aug 11, 3:43 PM CDT | Areal Flood Advisory | HGX | Harris | 3 hr |
| Aug 11, 3:47 PM CDT | Special Weather Statement | HGX | Waller | 43 min |
| Aug 11, 3:57 PM CDT | Special Weather Statement | HGX | Fort Bend | 48 min |
| Aug 11, 4:28 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, Walker | 32 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.