Alert archive / Texas / Flash Flood Warnings in 2020
Flash Flood Warning 17, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Aug 1, 2020, 4:30 AM CDT for 5 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 counties it named.
The facts
- Issued
- Aug 1, 2020, 4:30 AM CDT (09:30 UTC)
- Expired
- Aug 1, 2020, 7:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Brazos County, TX, Burleson County, TX, Grimes County, TX, Waller County, TX, Washington County, TX
The radar
The Ft Hood radar (KGRK), 114 km from the middle of the area, began a volume at 09:31 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 00:00Z, 9.5 hours before the alert went out and 295 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
- 2732 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 942 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 40 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 Aug 1, 4:00 AM CDT, 30 minutes earlier.
Area forecast discussion, Aug 1, 4:00 AM CDT, 30 minutes before
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Special weather statement, Aug 1, 12:40 AM CDT, 3 hours 50 minutes 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 |
|---|---|---|---|---|
| Aug 1, 12:14 AM CDT | Areal Flood Advisory | HGX | Brazos, Burleson, Grimes, Waller, Washington | 2 hr |
| Aug 1, 12:40 AM CDT | Special Weather Statement | HGX | Burleson | 35 min |
| Aug 1, 12:41 AM CDT | Areal Flood Advisory | HGX | Brazos, Burleson, Washington | 2 hr |
| Aug 1, 1:34 AM CDT | Flash Flood Warning | HGX | Brazos, Burleson, Grimes, Waller, Washington | 3 hr |
| Aug 1, 2:27 AM CDT | Areal Flood Advisory | HGX | Brazos, Grimes | 2 hr |
| Aug 1, 3:05 AM CDT | Areal Flood Advisory | HGX | Fort Bend, Harris, Montgomery, Waller | 3 hr |
| Aug 1, 5:08 AM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Harris | 112 min |
| Aug 1, 6:23 AM CDT | Special Weather Statement | HGX | Austin | 52 min |
| Aug 1, 1:11 PM CDT | Special Marine Warning | HGX | 64 min | |
| Aug 1, 1:11 PM CDT | Special Weather Statement | HGX | Jackson | 49 min |
| Aug 1, 2:08 PM CDT | Special Marine Warning | HGX | 52 min |
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.