Alert archive / Texas / Wind Advisories in 2021
Wind Advisory 5, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this wind advisory at Apr 17, 2021, 3:17 AM CDT for Brazoria County, Galveston County, Matagorda County, Texas. It took effect at Apr 17, 2021, 7:00 AM CDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Apr 17, 2021, 3:17 AM CDT (08:17 UTC)
- In effect from
- Apr 17, 2021, 7:00 AM CDT
- Expired
- Apr 17, 2021, 7:00 PM CDT
- In force
- 12 hr
- Issued by
- NWS Houston/Galveston, TX
Counties Brazoria County, TX, Galveston County, TX, Matagorda County, TX
The radar
The Houston radar (KHGX), 54 km from the middle of the area, began a volume at 08:21 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
Corpus Christi, TX (KCRP), launched 00:00Z, 8.3 hours before the alert went out and 241 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
- 2120 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 535 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- -0.3
- Supercell composite
- -2.3
The text
As transmitted.
867 WWUS74 KHGX 170817 NPWHGX URGENT - WEATHER MESSAGE National Weather Service Houston/Galveston TX 317 AM CDT Sat Apr 17 2021 TXZ338-436>439-171630- /O.NEW.KHGX.WI.Y.0005.210417T1200Z-210418T0000Z/ Coastal Galveston-Matagorda Islands-Brazoria Islands- Galveston Island-Bolivar Peninsula- Including the cities of Texas City, Dickinson, La Marque, Surfside Beach, and Galveston 317 AM CDT Sat Apr 17 2021 ...WIND ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 PM CDT THIS EVENING... * WHAT...North winds up to 25 mph with gusts up to 30 mph expected. * WHERE...Coastal Galveston, Matagorda Islands, Brazoria Islands, Galveston Island and Bolivar Peninsula Counties. * WHEN...From 7 AM this morning to 7 PM CDT this evening. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
1 follow-up statement
013 WWUS74 KHGX 180002 NPWHGX URGENT - WEATHER MESSAGE National Weather Service Houston/Galveston TX 702 PM CDT Sat Apr 17 2021 TXZ437>439-180300- /O.EXP.KHGX.WI.Y.0005.000000T0000Z-210418T0000Z/ /O.NEW.KHGX.WI.Y.0006.210418T0002Z-210418T0300Z/ Brazoria Islands-Galveston Island-Bolivar Peninsula- Including the cities of Surfside Beach and Galveston 702 PM CDT Sat Apr 17 2021 ...WIND ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING... * WHAT...North winds 15 to 25 mph with gusts up to 30 mph. * WHERE...Brazoria Islands, Galveston Island and the Bolivar Peninsula. * WHEN...Until 10 PM CDT this evening. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ TXZ338-436-180115- /O.EXP.KHGX.WI.Y.0005.000000T0000Z-210418T0000Z/ Coastal Galveston-Matagorda Islands- Including the cities of Texas City, Dickinson, and La Marque 702 PM CDT Sat Apr 17 2021 ...WIND ADVISORY HAS EXPIRED... Sustained winds have fallen below 25 miles per hour and the Wind Advisory previously in effect has been allowed to expire. $$
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 8:03 PM CDT | Areal Flood Advisory | HGX | Austin, Colorado, Wharton | 117 min |
Nearby
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.