Alert archive / Texas / Flash Flood Warnings in 2023

Flash Flood Warning 15, NWS Houston/Galveston, TX

September 15, 2023Galveston County, Harris County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Sep 15, 2023, 4:31 PM CDT for Galveston County, Harris County, 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 15, 2023, 4:31 PM CDT (21:31 UTC)
Expired
Sep 15, 2023, 6:37 PM CDT
In force
2 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 12 km from the middle of the area, began a volume at 21:35 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, 9.5 hours before the alert went out and 193 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.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2023-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2023-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
173 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
818 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 14, 7:15 PM CDTSpecial Weather StatementHGXColorado30 min
Sep 14, 7:31 PM CDTSevere Thunderstorm WarningHGXColorado44 min
Sep 14, 10:36 PM CDTSpecial Marine WarningHGX54 min
Sep 14, 11:33 PM CDTSpecial Marine WarningHGX57 min
Sep 15, 12:31 AM CDTSpecial Marine WarningHGX59 min
Sep 15, 1:04 PM CDTSpecial Weather StatementHGXAustin, Washington26 min
Sep 15, 1:29 PM CDTSpecial Weather StatementHGXAustin, Brazos, Grimes, Washington46 min
Sep 15, 1:36 PM CDTSpecial Weather StatementHGXLiberty39 min
Sep 15, 2:13 PM CDTSpecial Weather StatementHGXGrimes32 min
Sep 15, 2:14 PM CDTSpecial Weather StatementHGXAustin, Colorado, Waller31 min
Sep 15, 2:43 PM CDTSevere Thunderstorm WarningHGXGrimes, Montgomery18 min
Sep 15, 2:47 PM CDTSpecial Weather StatementHGXMontgomery28 min
Sep 15, 3:02 PM CDTSpecial Weather StatementHGXHarris28 min
Sep 15, 3:07 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery23 min
Sep 15, 3:22 PM CDTSpecial Weather StatementHGXBrazoria23 min
Sep 15, 3:29 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery20 min
Sep 15, 3:32 PM CDTSpecial Marine WarningHGX88 min
Sep 15, 3:41 PM CDTAreal Flood AdvisoryHGXHarris2 hr
Sep 15, 3:47 PM CDTSpecial Weather StatementHGXFort Bend, Wharton28 min
Sep 15, 3:48 PM CDTSevere Thunderstorm WarningHGXHarris27 min
Sep 15, 4:03 PM CDTSpecial Weather StatementHGXGalveston27 min
Sep 15, 4:06 PM CDTSevere Thunderstorm WarningHGXChambers, Harris24 min
Sep 15, 4:14 PM CDTAreal Flood AdvisoryHGXBrazoria, Galveston, Harris2 hr
Sep 15, 4:32 PM CDTSpecial Marine WarningHGX88 min
Sep 15, 4:42 PM CDTSpecial Weather StatementHGXBrazoria, Galveston63 min
Sep 15, 5:20 PM CDTSpecial Marine WarningHGX85 min
Sep 15, 5:56 PM CDTSpecial Marine WarningHGX2 hr

Nearby

Flash Flood Warnings in Texas, 2023Every flash flood warning in 2023

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.