Alert archive / Texas / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 65, NWS Houston/Galveston, TX

April 21, 20234 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 21, 2023, 4:28 AM CDT for 4 counties in Texas. It was in force for 32 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
Apr 21, 2023, 4:28 AM CDT (09:28 UTC)
Expired
Apr 21, 2023, 5:00 AM CDT
In force
32 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Brazoria County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 26 km from the middle of the area, began a volume at 09:29 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 20, 8:18 PM CDTSevere Thunderstorm WatchSPC9 hr
Apr 21, 1:54 AM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.5 hours before the alert went out and 220 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 2023-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 587 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 2023-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
587 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
831 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 7:10 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Washington65 min
Apr 20, 7:33 PM CDTSpecial Weather StatementHGXWalker27 min
Apr 20, 8:14 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Harris, Madison, Waller and 1 more61 min
Apr 20, 8:53 PM CDTSevere Thunderstorm WarningHGXGrimes, Houston, Madison, Montgomery, San Jacinto, Trinity and 1 more52 min
Apr 20, 8:59 PM CDTAreal Flood AdvisoryHGXBrazos2 hr
Apr 20, 9:37 PM CDTSpecial Weather StatementHGXWashington38 min
Apr 20, 10:29 PM CDTSevere Thunderstorm WarningHGXColorado19 min
Apr 20, 10:41 PM CDTSpecial Weather StatementHGXWaller34 min
Apr 20, 10:46 PM CDTSpecial Weather StatementHGXAustin29 min
Apr 20, 10:47 PM CDTSpecial Weather StatementHGXLiberty28 min
Apr 20, 11:14 PM CDTSpecial Weather StatementHGXLiberty46 min
Apr 20, 11:14 PM CDTSpecial Weather StatementHGXHarris31 min
Apr 20, 11:21 PM CDTSevere Thunderstorm WarningHGXHarris, Liberty, Montgomery24 min
Apr 20, 11:45 PM CDTSpecial Weather StatementHGXLiberty30 min
Apr 20, 11:47 PM CDTSpecial Weather StatementHGXLiberty43 min
Apr 21, 12:15 AM CDTSpecial Weather StatementHGXChambers, Harris, Liberty45 min
Apr 21, 12:43 AM CDTSpecial Weather StatementHGXGalveston32 min
Apr 21, 1:02 AM CDTSpecial Weather StatementHGXMontgomery28 min
Apr 21, 1:11 AM CDTSpecial Marine WarningHGX34 min
Apr 21, 1:15 AM CDTSpecial Weather StatementHGXChambers30 min
Apr 21, 1:44 AM CDTSpecial Marine WarningHGX20 min
Apr 21, 2:03 AM CDTSpecial Marine WarningHGX27 min
Apr 21, 2:09 AM CDTSevere Thunderstorm Warning Considerable damage threatHGXColorado, Jackson, Wharton51 min
Apr 21, 2:39 AM CDTSpecial Weather StatementHGXWaller36 min
Apr 21, 2:59 AM CDTSevere Thunderstorm WarningHGXColorado, Jackson, Wharton31 min
Apr 21, 3:04 AM CDTSpecial Weather StatementHGXMatagorda26 min
Apr 21, 3:14 AM CDTAreal Flood AdvisoryHGXMontgomery, San Jacinto3 hr
Apr 21, 3:27 AM CDTSevere Thunderstorm WarningHGXBrazoria, Colorado, Fort Bend, Jackson, Matagorda, Wharton33 min
Apr 21, 3:32 AM CDTSpecial Marine WarningHGX28 min
Apr 21, 3:49 AM CDTSpecial Marine WarningHGX26 min
Apr 21, 3:55 AM CDTSpecial Marine WarningHGX35 min
Apr 21, 3:59 AM CDTSpecial Weather StatementHGXBrazoria, Fort Bend31 min
Apr 21, 4:06 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris24 min
Apr 21, 4:12 AM CDTSpecial Marine WarningHGX33 min
Apr 21, 4:30 AM CDTSpecial Marine WarningHGX30 min
Apr 21, 4:44 AM CDTSpecial Marine WarningHGX46 min
Apr 21, 4:53 AM CDTSpecial Marine WarningHGX52 min
Apr 21, 4:58 AM CDTSpecial Weather StatementHGXChambers, Galveston62 min
Apr 21, 5:00 AM CDTSpecial Marine WarningHGX30 min
Apr 21, 5:23 AM CDTSpecial Marine WarningHGX37 min
Apr 21, 5:28 AM CDTSpecial Marine WarningHGX32 min
Apr 21, 5:32 AM CDTSpecial Marine WarningHGX43 min
Apr 21, 5:59 AM CDTSpecial Marine WarningHGX46 min
Apr 21, 6:47 AM CDTSpecial Marine WarningHGX43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2023Every severe thunderstorm 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.