Alert archive / Texas / Flash Flood Warnings in 2020
Flash Flood Warning 31, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Sep 22, 2020, 8:57 PM CDT for 4 counties in Texas. It was in force for 2 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
- Sep 22, 2020, 8:57 PM CDT (01:57 UTC)
- Expired
- Sep 22, 2020, 11:00 PM CDT
- In force
- 2 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chambers County, TX, Harris County, TX, Liberty County, TX, Montgomery County, TX
The radar
The Houston radar (KHGX), 59 km from the middle of the area, began a volume at 02:02 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
Shreveport, LA (KSHV), launched 00:00Z, 2.0 hours before the alert went out and 304 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 522 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash 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 flash flood warning went out at Sep 22, 6:56 PM CDT, 2 hours 1 minute earlier.
Area forecast discussion, Sep 22, 6:56 PM CDT, 2 hours 1 minute 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 |
|---|---|---|---|---|
| Sep 22, 7:01 PM CDT | Areal Flood Advisory | HGX | Brazoria, Galveston, Harris | 4 hr |
| Sep 22, 7:49 PM CDT | Flash Flood Warning | HGX | Harris, Waller | 3 hr |
| Sep 22, 8:18 PM CDT | River Flood Warning | HGX | Harris | 6 hr |
| Sep 22, 9:05 PM CDT | River Flood Warning | HGX | Austin, Colorado, Fort Bend, Wharton | 60 hr |
| Sep 22, 9:18 PM CDT | River Flood Warning | HGX | Brazoria | 13 hr |
| Sep 22, 9:23 PM CDT | River Flood Warning | HGX | Harris | 5 hr |
| Sep 22, 10:51 PM CDT | Areal Flood Warning | HGX | Fort Bend, Harris, Waller | 3 hr |
| Sep 22, 10:53 PM CDT | River Flood Warning | HGX | Harris | 9 hr |
| Sep 23, 12:19 AM CDT | Areal Flood Advisory | HGX | Chambers, Harris, Liberty | 116 min |
| Sep 23, 7:14 AM CDT | Coastal Flood Advisory | HGX | Brazoria, Galveston, Matagorda | 21 hr |
| Sep 23, 7:14 AM CDT | Rip Current Statement | HGX | Brazoria, Galveston, Matagorda | 6 hr |
Nearby
Flash Flood Warnings in Texas, 2020Every flash flood warning in 2020
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.