Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at May 1, 2021, 5:06 AM CDT for 4 counties in Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 1, 2021, 5:06 AM CDT (10:06 UTC)
- Expired
- May 1, 2021, 8:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Brazoria County, TX, Fort Bend County, TX, Matagorda County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 97 km from the middle of the area, began a volume at 10:09 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, 10.1 hours before the alert went out and 214 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
- 42 J/kg
- Mixed-layer CIN
- -278 J/kg
- Mixed-layer LCL
- 901 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
509
WGUS54 KHGX 011006
FFWHGX
TXC039-157-321-481-011315-
/O.NEW.KHGX.FF.W.0002.210501T1006Z-210501T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
506 AM CDT Sat May 1 2021
The National Weather Service in League City has issued a
* Flash Flood Warning for...
West Central Brazoria County in southeastern Texas...
Southwestern Fort Bend County in southeastern Texas...
North Central Matagorda County in southeastern Texas...
Northeastern Wharton County in southeastern Texas...
* Until 815 AM CDT.
* At 506 AM CDT, Doppler radar indicated slow moving thunderstorms
producing heavy rain across the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Wharton, East Bernard, Kendleton, Boling-Iago, Pierce, Hungerford
and Egypt.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
&&
LAT...LON 2923 9625 2931 9628 2946 9629 2954 9624
2957 9608 2951 9599 2936 9590 2927 9582
2918 9580 2909 9582 2908 9589 2916 9609
2920 9619
FLASH FLOOD...RADAR INDICATED
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 8:36 PM CDT | River Flood Warning | HGX | Matagorda, Wharton | 65 hr |
| May 1, 3:44 AM CDT | Areal Flood Advisory | HGX | Austin, Brazoria, Colorado, Fort Bend, Jackson, Matagorda and 1 more | 3 hr |
| May 1, 4:43 AM CDT | Rip Current Statement | HGX | Brazoria, Galveston, Matagorda | 17 hr |
| May 1, 4:50 AM CDT | Small Craft Advisory | HGX | 17 hr | |
| May 1, 6:01 AM CDT | Special Marine Warning | HGX | 59 min | |
| May 1, 6:08 AM CDT | Areal Flood Warning | HGX | Austin, Brazoria, Fort Bend, Matagorda, Wharton | 3 hr |
| May 1, 7:49 AM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Harris, Matagorda | 3 hr |
| May 1, 7:59 AM CDT | Areal Flood Advisory | HGX | Austin, Brazoria, Colorado, Fort Bend, Matagorda, Wharton | 4 hr |
| May 1, 8:04 AM CDT | River Flood Warning | HGX | Brazoria, Fort Bend, Wharton | 7 days |
| May 1, 9:09 AM CDT | Areal Flood Warning | HGX | Brazoria, Fort Bend, Matagorda, Wharton | 3 hr |
| May 1, 9:32 AM CDT | River Flood Warning | HGX | Jackson | 72 hr |
| May 1, 9:32 AM CDT | River Flood Warning | HGX | Jackson, Wharton | 12 hr |
| May 1, 9:32 AM CDT | River Flood Warning | HGX | Colorado, Jackson, Wharton | 52 hr |
| May 1, 9:55 AM CDT | River Flood Warning | HGX | Harris, Montgomery | 24 hr |
| May 1, 12:00 PM CDT | Areal Flood Warning | HGX | Brazoria, Matagorda | 3 hr |
| May 1, 12:37 PM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Matagorda, Wharton | 2 hr |
| May 1, 1:53 PM CDT | River Flood Warning | HGX | Brazoria | 21 days |
| May 1, 1:53 PM CDT | River Flood Warning | HGX | Austin, Colorado, Fort Bend, Wharton | 3 days |
| May 1, 2:15 PM CDT | River Flood Warning | HGX | Lavaca | 21 days |
| May 1, 2:25 PM CDT | Areal Flood Advisory | HGX | Waller | 8 hr |
| May 1, 2:29 PM CDT | Areal Flood Advisory | HGX | Waller | 8 hr |
| May 1, 4:13 PM CDT | Areal Flood Advisory | HGX | Montgomery | 6 hr |
Nearby
Flash Flood Warnings in Texas, 2021Every flash 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.