Alert archive / Texas / Areal Flood Warnings in 2021
Areal Flood Warning 18, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this areal flood warning at May 25, 2021, 12:19 AM CDT for 4 counties in Texas. It was in force for 6 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 25, 2021, 12:19 AM CDT (05:19 UTC)
- Expired
- May 25, 2021, 6:15 AM CDT
- In force
- 6 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Austin County, TX, Colorado County, TX, Waller County, TX, Washington County, TX
The radar
The Houston radar (KHGX), 129 km from the middle of the area, began a volume at 05:19 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, 5.3 hours before the alert went out and 299 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
- 890 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.4
What forecasters said that day
The local office's own words before this areal 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 areal flood warning went out at May 24, 11:21 PM CDT, 58 minutes earlier.
Area forecast discussion, May 24, 11:21 PM CDT, 58 minutes before
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</html>In the hours before
Local storm report, May 24, 7:04 PM CDT, 5 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
704 PM CDT MON MAY 24 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0652 PM FLASH FLOOD 8 SSW BRENHAM 30.06N 96.46W
05/24/2021 AUSTIN TX LAW ENFORCEMENT
FM 109 AT WILLIAMS CREEK WAS UNDER WATER AND
CLOSED TO TRAFFIC. 6 TO 8 INCHES OF RAIN HAS
FALLEN IN THIS AREA.
&&
CARLocal storm report, May 24, 8:28 PM CDT, 3 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
828 PM CDT MON MAY 24 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM FLASH FLOOD 9 WNW BELLVILLE 30.02N 96.39W
05/24/2021 AUSTIN TX LAW ENFORCEMENT
FM 2754 AT EAST MILL CREEK IS IMPASSABLE DUE
TO HIGH WATER.
&&
CARLocal storm report, May 24, 8:31 PM CDT, 3 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
831 PM CDT MON MAY 24 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM FLASH FLOOD 4 WNW BELLVILLE 29.96N 96.32W
05/24/2021 AUSTIN TX PUBLIC
COUNTY ROAD 159 AT EAST MILL CREEK IS
IMPASSABLE DUE TO HIGH WATER.
&&
CARLocal storm report, May 24, 8:34 PM CDT, 3 hours 45 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
834 PM CDT MON MAY 24 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0655 PM FLASH FLOOD 11 SSW BRENHAM 30.01N 96.45W
05/24/2021 AUSTIN TX LAW ENFORCEMENT
FM 2754 WAS CLOSED DUE TO HIGH WATER IN
BLEIBERVILLE.
&&
CARThe office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 8:15 PM CDT | River Flood Warning | HGX | Hardin, Liberty, Polk | 38 hr |
| May 24, 8:41 PM CDT | Areal Flood Advisory | HGX | Austin, Grimes, Waller, Washington | 2 hr |
| May 24, 9:38 PM CDT | Areal Flood Warning | HGX | Austin, Colorado, Washington | 112 min |
| May 24, 9:39 PM CDT | Flash Flood Watch | HGX | Austin, Brazoria, Brazos, Burleson, Colorado, Fort Bend and 14 more | 21 hr |
| May 25, 6:02 AM CDT | Areal Flood Warning | HGX | Austin, Colorado, Waller, Washington | 6 hr |
| May 25, 9:12 AM CDT | River Flood Warning | HGX | Harris | 10 hr |
| May 25, 12:03 PM CDT | Areal Flood Warning | HGX | Colorado | 6 hr |
| May 25, 1:17 PM CDT | Special Weather Statement | HGX | Grimes | 58 min |
| May 25, 2:31 PM CDT | Areal Flood Advisory | HGX | Austin, Colorado, Waller | 3 hr |
| May 25, 3:48 PM CDT | Areal Flood Advisory | HGX | Grimes, Harris, Montgomery, Waller | 3 hr |
| May 25, 5:19 PM CDT | Special Weather Statement | HGX | Polk | 41 min |
Nearby
Areal Flood Warnings in Texas, 2021Every areal 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.