Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 42, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Oct 2, 2021, 12:21 PM CDT for Harris County, Texas. It was in force for 74 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, 12:21 PM CDT (17:21 UTC)
- Expired
- Oct 2, 2021, 1:35 PM CDT
- In force
- 74 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Harris County, TX
The radar
The Houston radar (KHGX), 60 km from the middle of the area, began a volume at 17:25 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, 5.4 hours before the alert went out and 197 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.
294
WGUS54 KHGX 021721
FFWHGX
TXC201-021915-
/O.NEW.KHGX.FF.W.0042.211002T1721Z-211002T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
1221 PM CDT Sat Oct 2 2021
The National Weather Service in League City has issued a
* Flash Flood Warning for...
Harris County in southeastern Texas...
* Until 215 PM CDT.
* At 1221 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 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...
Humble, Kingwood, northwestern Atascocita, Lake Houston and
southeastern Bush Intercontinental Airport.
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.
&&
LAT...LON 2999 9528 3007 9520 3001 9517 2991 9528
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
040 WGUS74 KHGX 021835 FFSHGX Flash Flood Statement National Weather Service Houston/Galveston TX 135 PM CDT Sat Oct 2 2021 TXC201-021845- /O.CAN.KHGX.FF.W.0042.000000T0000Z-211002T1915Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Harris TX- 135 PM CDT Sat Oct 2 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR PORTIONS OF NORTHEAST HARRIS COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 2999 9528 3007 9520 3001 9517 2991 9528 $$
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 2, 8:27 AM CDT | Flash Flood Warning | HGX | Brazoria | 38 min |
| 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 |
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.