Alert archive / Texas / Flash Flood Warnings in 2022

Flash Flood Warning 15, NWS Houston/Galveston, TX

December 30, 2022Brazoria County, Galveston County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Dec 30, 2022, 1:03 AM CST for Brazoria County, Galveston County, 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
Dec 30, 2022, 1:03 AM CST (07:03 UTC)
Expired
Dec 30, 2022, 4:00 AM CST
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Brazoria County, TX, Galveston County, TX

The radar

The Houston radar (KHGX), 27 km from the middle of the area, began a volume at 07:04 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, 7.1 hours before the alert went out and 210 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 2022-12-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 309 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 2022-12-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 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
309 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
209 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.5

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 Dec 29, 11:47 PM CST, 1 hour 16 minutes earlier.

Area forecast discussion, Dec 29, 11:47 PM CST, 1 hour 16 minutes before
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In the hours before

Special weather statement, Dec 29, 7:43 PM CST, 5 hours 20 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
743 PM CST Thu Dec 29 2022

TXZ163-176-177-196>199-300215-
Madison TX-Walker TX-Brazos TX-Washington TX-Grimes TX-Montgomery TX-
Houston TX-
743 PM CST Thu Dec 29 2022

...Strong thunderstorms will impact portions of Grimes, southeastern
Brazos, northeastern Washington, northwestern Montgomery,
southwestern Houston, Madison and west central Walker Counties
through 815 PM CST...

At 745 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles southwest of Centerville to near
Bedias to Washington. Movement was northeast at 25 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Navasota, Madisonville, Washington, Bedias, Anderson, Roans Prairie,
Richards and Carlos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3094 9572 3039 9584 3022 9624 3077 9603
      3104 9610 3107 9605 3107 9601 3109 9598
      3109 9577 3114 9577
TIME...MOT...LOC 0142Z 214DEG 24KT 3113 9607 3083 9599 3034 9618

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

KW
Special weather statement, Dec 29, 8:13 PM CST, 4 hours 50 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
813 PM CST Thu Dec 29 2022

TXZ163-176-177-196>199-212-213-300245-
Madison TX-Walker TX-Brazos TX-Washington TX-Waller TX-Grimes TX-
Inland Harris TX-Montgomery TX-Houston TX-
813 PM CST Thu Dec 29 2022

...Strong thunderstorms will impact portions of Grimes, southeastern
Brazos, northeastern Washington, northwestern Montgomery,
southwestern Houston, Madison, northern Waller, southwestern Walker
and northwestern Harris Counties through 845 PM CST...

At 811 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles north of Madisonville to 6 miles
northwest of Hempstead. Movement was east at 20 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Navasota, Madisonville, Austonio, Washington, Bedias, Millican,
Anderson, Todd Mission, Iola, North Zulch, Dacus, Plantersville,
Roans Prairie, Richards and Carlos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3127 9556 3012 9587 3015 9630 3104 9610
      3109 9598 3109 9577 3114 9577 3116 9573
      3118 9575 3121 9574
TIME...MOT...LOC 0211Z 249DEG 18KT 3111 9586 3017 9614

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

KW
Special weather statement, Dec 29, 8:50 PM CST, 4 hours 13 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
850 PM CST Thu Dec 29 2022

TXZ163-164-176-177-196>199-210>213-300315-
Madison TX-Walker TX-Brazos TX-Washington TX-Waller TX-Grimes TX-
Colorado TX-Inland Harris TX-Montgomery TX-Houston TX-Austin TX-
Trinity TX-
850 PM CST Thu Dec 29 2022

...Strong thunderstorms will impact portions of west central Trinity,
northeastern Colorado, northeastern Austin, Grimes, southeastern
Brazos, eastern Washington, northwestern Montgomery, Houston, eastern
Madison, Waller, Walker and northwestern Harris Counties through 915
PM CST...

At 850 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles southwest of Crockett to near
Hempstead. Movement was east at 30 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Huntsville, Navasota, Crockett, Hempstead, Prairie View,
Madisonville, Bellville, Austonio, Washington, Trinity, Waller,
Grapeland, Pine Island, Lovelady, Montgomery, Bedias, Kennard,
Latexo, Millican and Anderson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3158 9517 3153 9511 3147 9510 3147 9507
      2995 9593 2961 9657 3109 9592 3109 9577
      3114 9577 3116 9573 3121 9575 3123 9573
      3127 9573 3132 9566 3145 9571 3146 9575
      3147 9572 3150 9574 3154 9565 3159 9528
TIME...MOT...LOC 0250Z 276DEG 25KT 3123 9552 3011 9617

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

KW
Local storm report, Dec 29, 10:37 PM CST, 2 hours 26 minutes before
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Local storm report, Dec 29, 11:13 PM CST, 1 hour 50 minutes before
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Local storm report, Dec 30, 12:47 AM CST, 16 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 29, 6:32 PM CSTSpecial Marine WarningHGX28 min
Dec 29, 6:38 PM CSTSpecial Weather StatementHGXBrazos, Washington37 min
Dec 29, 6:58 PM CSTSpecial Marine WarningHGX32 min
Dec 29, 7:14 PM CSTSpecial Marine WarningHGX16 min
Dec 29, 7:20 PM CSTSpecial Weather StatementHGXGrimes, Madison25 min
Dec 29, 7:31 PM CSTSpecial Marine WarningHGX29 min
Dec 29, 7:43 PM CSTSpecial Weather StatementHGXGrimes, Madison32 min
Dec 29, 7:53 PM CSTSpecial Marine WarningHGX37 min
Dec 29, 8:13 PM CSTSpecial Weather StatementHGXGrimes, Madison32 min
Dec 29, 8:31 PM CSTAreal Flood AdvisoryHGXBrazoria, Galveston119 min
Dec 29, 8:34 PM CSTSpecial Marine WarningHGX26 min
Dec 29, 8:50 PM CSTSpecial Weather StatementHGXAustin, Grimes, Houston, Madison, Walker, Waller25 min
Dec 29, 8:59 PM CSTSpecial Marine WarningHGX31 min
Dec 29, 9:28 PM CSTSpecial Marine WarningHGX32 min
Dec 29, 9:42 PM CSTTornado WarningHGXGalveston33 min
Dec 29, 10:02 PM CSTSpecial Marine WarningHGX28 min
Dec 29, 10:10 PM CSTSevere Thunderstorm WarningHGXChambers, Galveston20 min
Dec 29, 10:18 PM CSTSpecial Marine WarningHGX27 min
Dec 29, 10:19 PM CSTSpecial Marine WarningHGX26 min
Dec 29, 10:21 PM CSTSpecial Marine WarningHGX24 min
Dec 29, 10:25 PM CSTSevere Thunderstorm WarningHGXChambers, Galveston20 min
Dec 29, 10:26 PM CSTAreal Flood AdvisoryHGXBrazoria, Galveston109 min
Dec 29, 10:36 PM CSTSpecial Marine WarningHGX24 min
Dec 29, 10:38 PM CSTSpecial Marine WarningHGX37 min
Dec 29, 10:59 PM CSTSpecial Marine WarningHGX31 min
Dec 29, 11:03 PM CSTFlash Flood WarningHGXBrazoria, Galveston117 min
Dec 29, 11:26 PM CSTAreal Flood AdvisoryHGXAustin, Colorado, Waller, Washington2 hr
Dec 29, 11:30 PM CSTSpecial Marine WarningHGX30 min
Dec 29, 11:34 PM CSTSpecial Marine WarningHGX26 min
Dec 29, 11:55 PM CSTSpecial Marine WarningHGX35 min
Dec 29, 11:58 PM CSTSpecial Marine WarningHGX32 min
Dec 30, 12:28 AM CSTSpecial Marine WarningHGX47 min
Dec 30, 12:34 AM CSTAreal Flood AdvisoryHGXChambers, Liberty3 hr
Dec 30, 12:38 AM CSTAreal Flood AdvisoryHGXBrazoria, Galveston3 hr
Dec 30, 12:38 AM CSTSpecial Marine WarningHGX37 min
Dec 30, 1:13 AM CSTSpecial Marine WarningHGX32 min
Dec 30, 1:17 AM CSTSevere Thunderstorm WarningHGXChambers, Liberty28 min
Dec 30, 1:44 AM CSTSevere Thunderstorm WarningHGXChambers, Liberty31 min
Dec 30, 2:01 AM CSTSpecial Marine WarningHGX44 min

Nearby

Flash Flood Warnings in Texas, 2022Every flash flood warning in 2022

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.