Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 41, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Oct 2, 2021, 8:27 AM CDT for Brazoria County, Texas. It was in force for 38 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
- Oct 2, 2021, 8:27 AM CDT (13:27 UTC)
- Expired
- Oct 2, 2021, 9:05 AM CDT
- In force
- 38 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Brazoria County, TX
The radar
The Houston radar (KHGX), 57 km from the middle of the area, began a volume at 13:31 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 12:00Z, 1.5 hours before the alert went out and 237 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
- 1519 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted.
545
WGUS54 KHGX 021327
FFWHGX
TXC039-021630-
/O.NEW.KHGX.FF.W.0041.211002T1327Z-211002T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
827 AM CDT Sat Oct 2 2021
The National Weather Service in League City has issued a
* Flash Flood Warning for...
South Central Brazoria County in southeastern Texas...
* Until 1130 AM CDT.
* At 827 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of South Central Brazoria County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 2897 9529 2898 9529 2901 9529 2902 9526
2898 9526
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
474
WGUS74 KHGX 021405
FFSHGX
Flash Flood Statement
National Weather Service Houston/Galveston TX
905 AM CDT Sat Oct 2 2021
TXC039-021415-
/O.CAN.KHGX.FF.W.0041.000000T0000Z-211002T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Brazoria TX-
905 AM CDT Sat Oct 2 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL BRAZORIA
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 2897 9529 2898 9529 2901 9529 2902 9526
2898 9526
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 2, 10:47 AM CDT | Areal Flood Advisory | HGX | Fort Bend, Harris | 118 min |
| Oct 2, 11:49 AM CDT | Areal Flood Advisory | HGX | Harris | 87 min |
| Oct 2, 12:00 PM CDT | Areal Flood Advisory | HGX | Harris | 93 min |
| Oct 2, 12:21 PM CDT | Flash Flood Warning | HGX | Harris | 74 min |
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.