Alert archive / Texas / Coastal Flood Warnings in 2021
Coastal Flood Warning 1, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this coastal flood warning at May 21, 2021, 11:30 PM CDT for 5 counties in Texas. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 2021, 11:30 PM CDT (04:30 UTC)
- Expired
- May 22, 2021, 7:00 AM CDT
- In force
- 8 hr
- Issued by
- NWS Houston/Galveston, TX
Counties Brazoria County, TX, Chambers County, TX, Galveston County, TX, Harris County, TX, Matagorda County, TX
The radar
The Houston radar (KHGX), 21 km from the middle of the area, began a volume at 04:31 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 00:00Z, 4.5 hours before the alert went out and 216 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
- 279 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 593 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
What forecasters said that day
The local office's own words before this coastal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Houston/Galveston, TX wrote its last area forecast discussion before this coastal flood warning went out at May 21, 6:44 PM CDT, 4 hours 46 minutes earlier.
Area forecast discussion, May 21, 6:44 PM CDT, 4 hours 46 minutes before
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</html>The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 11:30 PM CDT | Coastal Flood Advisory | HGX | Brazoria, Chambers, Galveston, Harris, Matagorda | 32 hr |
| May 22, 12:36 AM CDT | Rip Current Statement | HGX | Brazoria, Galveston, Matagorda | 24 hr |
| May 22, 3:14 AM CDT | Wind Advisory | HGX | Brazoria, Galveston, Jackson, Matagorda | 13 hr |
| May 22, 3:15 PM CDT | Flash Flood Watch | HGX | Austin, Brazoria, Colorado, Fort Bend, Grimes, Harris and 6 more | 54 hr |
Nearby
Coastal Flood Warnings in Texas, 2021Every coastal flood 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.