Alert archive / Texas / Flash Flood Warnings in 2026

Flash Flood Warning 28, NWS Houston/Galveston, TX

June 21, 2026Brazoria County, Matagorda County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 21, 2026, 6:17 AM CDT for Brazoria County, Matagorda County, Texas. It was in force for 103 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 2026, 6:17 AM CDT (11:17 UTC)
Expired
Jun 21, 2026, 8:00 AM CDT
In force
103 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Brazoria County, TX, Matagorda County, TX

The radar

The Houston radar (KHGX), 83 km from the middle of the area, began a volume at 11:16 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, 11.3 hours before the alert went out and 275 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 00:00Z on 2026-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2175 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 00:00Z on 2026-06-21The 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
2175 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
831 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

Open this sounding in Storm Lab

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 Jun 20, 2:50 PM CDT, 15 hours 27 minutes earlier.

Area forecast discussion, Jun 20, 2:50 PM CDT, 15 hours 27 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 7:16 PM CDTAreal Flood WarningHGXBrazoria, Galveston, Harris104 min
Jun 20, 8:21 PM CDTRiver Flood WarningHGXBrazos, Grimes, Madison6 days
Jun 21, 3:00 AM CDTSpecial Marine WarningHGX90 min
Jun 21, 4:26 AM CDTSpecial Marine WarningHGX2 hr
Jun 21, 4:57 AM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Matagorda, Wharton80 min
Jun 21, 5:18 AM CDTAreal Flood AdvisoryHGXColorado, Wharton22 min
Jun 21, 5:34 AM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Galveston, Harris3 hr
Jun 21, 5:39 AM CDTFlash Flood WarningHGXColorado66 min
Jun 21, 5:47 AM CDTSpecial Marine WarningHGX58 min
Jun 21, 6:12 AM CDTSpecial Weather StatementHGXBrazoria48 min
Jun 21, 6:28 AM CDTSpecial Marine WarningHGX2 hr
Jun 21, 6:55 AM CDTSpecial Marine WarningHGX95 min
Jun 21, 7:04 AM CDTAreal Flood AdvisoryHGXChambers116 min
Jun 21, 7:42 AM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty51 min
Jun 21, 8:08 AM CDTAreal Flood AdvisoryHGXBrazoria, Jackson, Matagorda112 min
Jun 21, 8:33 AM CDTFlash Flood WarningHGXChambers, Harris, Liberty72 min
Jun 21, 8:34 AM CDTSpecial Marine WarningHGX86 min
Jun 21, 8:52 AM CDTAreal Flood AdvisoryHGXBrazoria, Galveston3 hr
Jun 21, 9:44 AM CDTAreal Flood WarningHGXChambers, Harris, Liberty3 hr
Jun 21, 12:16 PM CDTRiver Flood WarningHGXPolk, San Jacinto9 hr

Nearby

Flash Flood Warnings in Texas, 2026Every flash flood warning in 2026

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.