Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 22, NWS Houston/Galveston, TX

April 28, 20095 counties in Texas

NWS Houston/Galveston, TX issued this flash flood warning at Apr 28, 2009, 8:24 AM CDT for 5 counties in Texas. It was in force for 66 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 28, 2009, 8:24 AM CDT (13:24 UTC)
Expired: Apr 28, 2009, 9:30 AM CDT
In force: 66 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Brazos County, TX, Burleson County, TX, Grimes County, TX, Waller County, TX, Washington County, TX

The radar

The Ft Hood radar (KGRK), 114 km from the middle of the area, began a volume at 13:28 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

Fort Worth, TX (KFWD), launched 12:00Z, 1.4 hours before the alert went out and 289 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 28, 7:02 AM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Apr 28, 7:02 AM CDT, 1 hour 22 minutes before

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Hazardous weather outlook, Apr 28, 7:24 AM CDT, 1 hour before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
724 AM CDT TUE APR 28 2009

TXZ163-164-176>179-195>200-210>214-226-227-235>238-291230-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-MADISON-MATAGORDA-
MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WALLER-WASHINGTON-
WHARTON-
724 AM CDT TUE APR 28 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

FLOODING CONCERNS ACROSS THE NORTHERN TWO THIRDS OF THE FORECAST
AREA THROUGH THIS EVENING. SLOW MOVING THUNDERSTORMS...WITH
REBUILDING CELLS OFF TO THE WEST...WILL PASS OVER REGIONS THAT
HAVE ALREADY RECEIVED 4-PLUS INCHES OF RAIN THIS MORNING. PLEASE
REFER TO THE APPROPRIATE FLOOD WATCHES AND WARNINGS TO KEEP
ABREAST OF THIS ONGOING SITUATION.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

MAIN HAZARDOUS WEATHER THREAT WILL BE WITH RETURNING
THUNDERSTORMS. AS OF NOW...THUNDERSTORMS ARE FORECAST TO
PRIMARILY AFFECT THE WESTERN AND NORTHERN COUNTIES OF OUR COUNTY
WARNING AREA. THE BEHAVIOR OF THESE STORMS WILL ULTIMATELY
DETERMINE THE DAY-TO-DAY THREATS...WHETHER THEY BE FLOODING
CONCERNS OR SEVERE WEATHER ELEMENTS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER VIGILANCE WILL BE NEEDED...AND GREATLY APPRECIATED...OVER THIS
COMING WEEK.

In the hours before

Local storm report, Apr 28, 2:38 AM CDT, 5 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
238 AM CDT TUE APR 28 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0226 AM     FLASH FLOOD      CYPRESS                 29.97N 95.70W
04/28/2009                   HARRIS             TX   TRAINED SPOTTER

            NEAR A FOOT OF WATER OVER MANY ROADWAYS IN AND AROUND
            CYPRESS. WATER OVER ROAD AT HIGHWAY 290 AMD MUESCHKE
            ROAD. LITTLE CYPRESS CREEK AT HOCKLEY GOING OVER BANKS.

&&

BLOOD

Local storm report, Apr 28, 3:52 AM CDT, 4 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
352 AM CDT TUE APR 28 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0348 AM     FLASH FLOOD      8 E KATY                29.80N 95.69W
04/28/2009                   HARRIS             TX   PUBLIC

            WATER IN HOMES AT BEAR CREEK.

&&

BLOOD

Local storm report, Apr 28, 5:19 AM CDT, 3 hours 5 minutes before

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Local storm report, Apr 28, 5:32 AM CDT, 2 hours 52 minutes before

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Local storm report, Apr 28, 6:13 AM CDT, 2 hours 11 minutes before

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Local storm report, Apr 28, 6:26 AM CDT, 1 hour 58 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:03 PM CDT	Flash Flood Warning	HGX	Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 1 more	117 min
Apr 27, 7:04 PM CDT	Areal Flood Advisory	HGX	Polk, San Jacinto	3 hr
Apr 27, 7:26 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Chambers, Galveston, Harris, Liberty	64 min
Apr 27, 7:30 PM CDT	Special Marine Warning	HGX		90 min
Apr 27, 7:33 PM CDT	Special Marine Warning	HGX		87 min
Apr 28, 1:12 AM CDT	Areal Flood Advisory	HGX	Harris	63 min
Apr 28, 1:50 AM CDT	Flash Flood Warning	HGX	Grimes, Harris, Montgomery, Waller	115 min
Apr 28, 2:51 AM CDT	Severe Thunderstorm Warning	HGX	Harris, Waller	39 min
Apr 28, 3:27 AM CDT	Flood Watch	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Fort Bend and 13 more	12 hr
Apr 28, 3:41 AM CDT	Flash Flood Warning	HGX	Fort Bend, Harris, Montgomery, Waller	3 hr
Apr 28, 4:07 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Harris	53 min
Apr 28, 4:24 AM CDT	Tornado Warning	HGX	Harris	36 min
Apr 28, 4:27 AM CDT	River Flood Warning	HGX	Harris	3 days
Apr 28, 4:27 AM CDT	River Flood Warning	HGX	Harris, Montgomery	41 hr
Apr 28, 4:49 AM CDT	River Flood Warning	HGX	Harris	4 hr
Apr 28, 5:09 AM CDT	River Flood Warning	HGX	Harris	41 hr
Apr 28, 5:32 AM CDT	Areal Flood Advisory	HGX	Brazos, Burleson, Grimes, Harris, Montgomery, Waller and 1 more	118 min
Apr 28, 5:37 AM CDT	River Flood Warning	HGX	Harris	23 hr
Apr 28, 5:48 AM CDT	River Flood Warning	HGX	Fort Bend, Harris	4 days
Apr 28, 6:12 AM CDT	River Flood Warning	HGX	Harris	54 hr
Apr 28, 6:27 AM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris, Waller	3 hr
Apr 28, 6:29 AM CDT	Flash Flood Warning	HGX	Brazoria, Fort Bend, Galveston, Harris, Waller	3 hr
Apr 28, 6:29 AM CDT	River Flood Warning	HGX	Harris	110 min
Apr 28, 6:33 AM CDT	Flash Flood Warning	HGX	Brazos, Burleson, Grimes, Waller, Washington	117 min
Apr 28, 7:51 AM CDT	Small Craft Advisory	HGX		23 hr
Apr 28, 9:35 AM CDT	River Flood Warning	HGX	Montgomery	11 hr
Apr 28, 9:43 AM CDT	Areal Flood Advisory	HGX	Harris, Montgomery	3 hr
Apr 28, 9:51 AM CDT	Flash Flood Warning	HGX	Brazos, Madison	114 min
Apr 28, 10:02 AM CDT	River Flood Warning	HGX	Harris	9 hr
Apr 28, 10:02 AM CDT	River Flood Warning	HGX	Harris	101 min
Apr 28, 10:02 AM CDT	River Flood Warning	HGX	Harris	5 hr
Apr 28, 11:08 AM CDT	Flash Flood Warning	HGX	Harris, Montgomery	112 min
Apr 28, 1:23 PM CDT	Areal Flood Advisory	HGX	Brazos, Burleson, Grimes, Washington	62 min
Apr 28, 2:31 PM CDT	River Flood Warning	HGX	Harris, Montgomery	31 hr
Apr 28, 2:31 PM CDT	River Flood Warning	HGX	Harris, Montgomery	40 hr
Apr 28, 2:31 PM CDT	River Flood Warning	HGX	Harris, Montgomery	21 hr
Apr 28, 3:38 PM CDT	Tornado Warning	HGX	Brazos, Madison	37 min
Apr 28, 4:16 PM CDT	Tornado Warning	HGX	Madison	29 min
Apr 28, 4:42 PM CDT	Tornado Warning	HGX	Grimes, Madison	33 min
Apr 28, 5:16 PM CDT	Tornado Warning	HGX	Madison	29 min
Apr 28, 5:46 PM CDT	Tornado Warning	HGX	Madison	29 min
Apr 28, 6:09 PM CDT	Flash Flood Warning	HGX	Madison	111 min
Apr 28, 6:38 PM CDT	River Flood Warning	HGX	Brazos, Grimes, Madison	6 days

Nearby

Flash Flood Warnings in Texas, 2009 Every flash flood warning in 2009

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.