Alert archive / Texas / Flash Flood Warnings in 2024

Flash Flood Warning 46, NWS Houston/Galveston, TX

May 31, 2024Montgomery County, Walker County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at May 31, 2024, 6:31 AM CDT for Montgomery County, Walker County, Texas. It was in force for 4 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
May 31, 2024, 6:31 AM CDT (11:31 UTC)
Expired
May 31, 2024, 10:08 AM CDT
In force
4 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Montgomery County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 125 km from the middle of the area, began a volume at 11:30 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, 11.5 hours before the alert went out and 229 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 2024-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2455 joules per kilogram.LCLEL10008507005003002001001 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 2024-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939Sfc1 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
2455 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
990 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.6

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 May 31, 2:21 AM CDT, 4 hours 10 minutes earlier.

Area forecast discussion, May 31, 2:21 AM CDT, 4 hours 10 minutes before
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In the hours before

Special weather statement, May 31, 5:32 AM CDT, 59 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
532 AM CDT Fri May 31 2024

TXZ163-176-177-195>199-210>213-311100-
Madison TX-Walker TX-Brazos TX-Washington TX-Waller TX-Grimes TX-
Burleson TX-Colorado TX-Inland Harris TX-Montgomery TX-Houston TX-
Austin TX-
532 AM CDT Fri May 31 2024

...STRONG THUNDERSTORMS WILL IMPACT NORTH CENTRAL COLORADO...
AUSTIN...GRIMES...BURLESON...BRAZOS...WASHINGTON...WESTERN
MONTGOMERY...WESTERN HOUSTON...MADISON...NORTHERN WALLER...WALKER AND
NORTHWESTERN HARRIS COUNTIES THROUGH 600 AM CDT...

At 530 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles south of Lovelady to 7 miles south of
La Grange. Movement was southeast at around 45 mph.

HAZARD...Wind gusts of up to 55 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
College Station, Bryan, western Conroe, Huntsville, Brenham,
Navasota, Crockett, Hempstead, Willis, Prairie View, Madisonville,
Caldwell, Bellville, Pinehurst, Austonio, The Woodlands, Washington,
Waller, Panorama Village, and Grapeland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
southeastern Texas.

&&

LAT...LON 3073 9662 3070 9656 3074 9646 3091 9635
      3107 9605 3109 9577 3127 9573 3132 9566
      3150 9574 3156 9549 3113 9543 3024 9549
      2971 9657 2986 9666 2996 9657 3015 9665
      3016 9679 3030 9664 3032 9674 3056 9696
TIME...MOT...LOC 1030Z 323DEG 41KT 3103 9547 2980 9687

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Cotto (24)

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 7:01 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Washington29 min
May 30, 7:12 PM CDTSevere Thunderstorm WarningHGXGrimes, Montgomery, Polk, San Jacinto, Trinity, Walker33 min
May 30, 7:20 PM CDTAreal Flood AdvisoryHGXGrimes, Montgomery, Walker3 hr
May 30, 7:45 PM CDTSevere Thunderstorm WarningHGXGrimes, Montgomery30 min
May 30, 8:16 PM CDTSpecial Weather StatementHGXMontgomery29 min
May 30, 8:47 PM CDTSpecial Weather StatementHGXHarris28 min
May 30, 8:55 PM CDTAreal Flood AdvisoryHGXGrimes, Harris, Montgomery114 min
May 30, 8:57 PM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty, Montgomery33 min
May 30, 9:03 PM CDTSpecial Marine WarningHGX87 min
May 30, 9:18 PM CDTAreal Flood WarningHGXMontgomery, Walker10 hr
May 30, 10:12 PM CDTSpecial Marine WarningHGX63 min
May 31, 2:53 AM CDTSmall Craft AdvisoryHGX10 hr
May 31, 4:36 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Houston, Madison, Montgomery and 3 more54 min
May 31, 5:32 AM CDTSpecial Weather StatementHGXAustin, Brazos, Burleson, Grimes, Madison, Montgomery and 3 more28 min
May 31, 5:36 AM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Houston, Madison, Montgomery, Walker24 min
May 31, 5:58 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Colorado, Grimes, Harris, Houston and 6 more47 min
May 31, 6:22 AM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Fort Bend, Harris, Houston, Montgomery and 6 more23 min
May 31, 6:41 AM CDTSpecial Marine WarningHGX2 hr
May 31, 6:46 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris, Liberty, Montgomery, San Jacinto and 1 more29 min
May 31, 6:46 AM CDTSevere Thunderstorm WarningHGXJackson, Matagorda, Wharton29 min
May 31, 6:50 AM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston, Harris25 min
May 31, 6:53 AM CDTTornado WarningHGXJackson, Matagorda, Wharton14 min
May 31, 7:12 AM CDTAreal Flood AdvisoryHGXHarris3 hr
May 31, 7:15 AM CDTSpecial Weather StatementHGXBrazoria, Fort Bend, Harris, Liberty, Matagorda30 min
May 31, 7:17 AM CDTSevere Thunderstorm WarningHGXJackson, Matagorda, Wharton28 min
May 31, 7:26 AM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston, Harris34 min
May 31, 7:42 AM CDTSevere Thunderstorm WarningHGXMatagorda33 min
May 31, 7:47 AM CDTSpecial Weather StatementHGXAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 10 more88 min
May 31, 7:47 AM CDTSevere Thunderstorm WarningHGXBrazoria, Chambers, Galveston28 min
May 31, 7:55 AM CDTSevere Thunderstorm WarningHGXChambers, Galveston, Liberty65 min
May 31, 7:59 AM CDTSevere Thunderstorm WarningHGXBrazoria, Matagorda31 min
May 31, 8:10 AM CDTSpecial Marine WarningHGX2 hr
May 31, 8:11 AM CDTAreal Flood AdvisoryHGXHarris, Montgomery2 hr
May 31, 8:12 AM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston33 min
May 31, 8:26 AM CDTAreal Flood AdvisoryHGXBrazoria, Galveston, Harris3 hr
May 31, 8:34 AM CDTAreal Flood AdvisoryHGXGalveston116 min
May 31, 8:40 AM CDTFlash Flood WarningHGXGalveston113 min
May 31, 8:46 AM CDTAreal Flood AdvisoryHGXBrazoria, Chambers, Galveston, Harris, Liberty119 min
May 31, 8:59 AM CDTAreal Flood AdvisoryHGXChambers, Galveston, Liberty2 hr
May 31, 9:07 AM CDTAreal Flood AdvisoryHGXColorado, Jackson, Matagorda, Wharton113 min
May 31, 9:19 AM CDTRiver Flood WarningHGXJackson, Wharton35 hr
May 31, 9:19 AM CDTRiver Flood WarningHGXMatagorda, Wharton47 hr
May 31, 9:19 AM CDTRiver Flood WarningHGXBrazoria, Fort Bend, Wharton11 hr
May 31, 10:08 AM CDTAreal Flood AdvisoryHGXMontgomery, Walker2 hr
May 31, 10:14 AM CDTSpecial Marine WarningHGX91 min
May 31, 10:33 AM CDTAreal Flood WarningHGXGalveston2 hr
May 31, 2:13 PM CDTSmall Craft AdvisoryHGX5 hr
May 31, 3:48 PM CDTRiver Flood WarningHGXHarris, Montgomery15 hr
May 31, 3:48 PM CDTRiver Flood WarningHGXLiberty26 days

Nearby

Flash Flood Warnings in Texas, 2024Every flash flood warning in 2024

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.