Alert archive / Texas / Flash Flood Watches in 2013

Flash Flood Watch 2, NWS Houston/Galveston, TX

May 10, 20139 counties in Texas

NWS Houston/Galveston, TX issued this flash flood watch at May 10, 2013, 4:18 AM CDT for 9 counties in Texas. It took effect at May 10, 2013, 5:00 AM CDT. It was in force for 23 hr.

The area

The counties it named.

The facts

Issued: May 10, 2013, 4:18 AM CDT (09:18 UTC)
In effect from: May 10, 2013, 5:00 AM CDT
Expired: May 11, 2013, 4:01 AM CDT
In force: 23 hr
Issued by: NWS Houston/Galveston, TX
Flood severity: None

Counties Fort Bend County, TX, Grimes County, TX, Harris County, TX, Liberty County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Walker County, TX, Waller County, TX

The radar

The Houston radar (KHGX), 96 km from the middle of the area, began a volume at 09:17 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, 9.3 hours before the alert went out and 217 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: 1022 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at May 10, 4:11 AM CDT, 7 minutes earlier.

Area forecast discussion, May 10, 4:11 AM CDT, 7 minutes before

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Hazardous weather outlook, May 9, 6:12 AM CDT, 22 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
612 AM CDT THU MAY 9 2013

TXZ163-164-176>179-195>200-210>214-226-227-235>238-101115-
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-
612 AM CDT THU MAY 9 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

THE PRESENCE OF A PASSING SHORTWAVE DISTURBANCE WILL DETERMINE
THE TIMING...LOCATION AND SEVERITY OF RAIN AND STORM ACTIVITY
LATTER TODAY. THE HIGHEST CHANCE FOR SIGNIFICANT WEATHER WILL BE
PRIMARILY FOCUSED ALONG AND NORTH OF THE INTERSTATE 10 CORRIDOR
FROM MID-DAY THROUGH THE OVERNIGHT HOURS FRIDAY MORNING. A STRONG
CAPPING INVERSION IS CURRENTLY IN PLACE AND THIS MAY LIMIT TODAY'S
RAIN CHANCES. ALTHOUGH INITIALLY DRIVEN BY A LARGER SCALE IMPULSE...
SMALLER SCALE INFLUENCES WILL LIKELY DICTATE THE WHEN AND WHERE OF
FUTURE DOWNSTREAM THUNDERSTORM DEVELOPMENT. THE MAIN THREATS FROM
ANY THUNDERSTORM ACTIVITY WILL BE DAMAGING DOWNBURST WINDS AND
LARGE HAIL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A SERIES OF UPPER LEVEL DISTURBANCES WILL CROSS SOUTHEAST TEXAS
FRIDAY THROUGH SATURDAY. THESE DISTURBANCES WILL LIKELY PRODUCE
OCCASIONAL SHOWERS AND THUNDERSTORMS...TIMING AND LOCATION WILL
REMAIN UNCLEAR. A COLD FRONT WILL ALSO PUSH SOUTH ACROSS THE
REGION SATURDAY THAT COULD ALLOW HEAVIER RAIN AND STORMS TO FOCUS
ACROSS THE FORECAST AREA'S MORE CENTRAL AND SOUTHERN COUNTIES.
CURRENT FORECAST STORM TOTAL RAINFALL AMOUNTS FROM OCCANSIONAL
EPISODES OF RAIN...OR SHOWERY WEATHER...AND SCATTERED THUNDERSTORM
ACTIVITY WILL AVERAGE BETWEEN AN AREAWIDE 1 AND 2 INCHES WITH THE
HIGHER TOTALS IN THE 3 TO 5 INCH RANGE WHERE TRAINING OCCURS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER AWARENESS AND POSSIBLE REPORTS WILL BE NEEDED FROM THIS
AFTERNOON THROUGH SATURDAY.

In the hours before

Special weather statement, May 10, 1:11 AM CDT, 3 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
111 AM CDT FRI MAY 10 2013

TXZ210-100645-
COLORADO TX-
111 AM CDT FRI MAY 10 2013

...SIGNIFICANT WEATHER ADVISORY...

AT 105 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR FLATONIA...OR ABOUT 20 MILES WEST
OF WEIMAR...MOVING EAST AT 40 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 30 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
COLUMBUS AND WEIMAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2979 9672 2996 9657 2991 9654 2985 9646
      2947 9644 2950 9672 2958 9679 2958 9683
      2962 9684 2963 9688
TIME...MOT...LOC 0605Z 268DEG 33KT 2971 9703

40

Special weather statement, May 10, 1:25 AM CDT, 2 hours 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
125 AM CDT FRI MAY 10 2013

TXZ197-210>212-100700-
COLORADO TX-AUSTIN TX-WALLER TX-WASHINGTON TX-
125 AM CDT FRI MAY 10 2013

...SPECIAL WEATHER STATEMENT...

AT 121 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES SOUTH OF BRENHAM...MOVING EAST AT 35 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 30 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
BRENHAM AND BELLVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3027 9611 3023 9611 3021 9617 3015 9616
      3016 9618 3014 9619 3011 9619 3000 9609
      2996 9612 2991 9612 2985 9646 2995 9658
      2996 9657 3013 9665
TIME...MOT...LOC 0621Z 265DEG 28KT 3005 9642

40

Special weather statement, May 10, 1:52 AM CDT, 2 hours 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
152 AM CDT FRI MAY 10 2013

TXZ200-213-214-227-237-100730-
FORT BEND TX-CHAMBERS TX-BRAZORIA TX-HARRIS TX-LIBERTY TX-
152 AM CDT FRI MAY 10 2013

...SPECIAL WEATHER STATEMENT...

AT 149 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR STAFFORD...MOVING NORTHEAST AT 50 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 30 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
HOUSTON...MISSOURI CITY...CHANNELVIEW...DEER PARK...SUGAR LAND...
CLOVERLEAF...FIRST COLONY...BELLAIRE...SOUTH HOUSTON...PECAN GROVE...
WEST UNIVERSITY PLACE...GALENA PARK...JACINTO CITY...STAFFORD...
HIGHLANDS...TOWN WEST...DAYTON...MEADOWS...HUNTERS CREEK VILLAGE AND
BUNKER HILL VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WAS ALSO DEVELOPING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2987 9473 2973 9503 2975 9506 2977 9504
      2978 9505 2975 9507 2972 9505 2944 9566
      2961 9578 3015 9495
TIME...MOT...LOC 0649Z 233DEG 44KT 2963 9550

40

Special weather statement, May 10, 2:01 AM CDT, 2 hours 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
201 AM CDT FRI MAY 10 2013

TXZ210>212-226-227-100730-
FORT BEND TX-COLORADO TX-AUSTIN TX-WALLER TX-WHARTON TX-
201 AM CDT FRI MAY 10 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN FORT BEND...EAST
CENTRAL COLORADO...SOUTHEASTERN AUSTIN...SOUTHWESTERN WALLER AND
NORTH CENTRAL WHARTON COUNTIES UNTIL 230 AM CDT...

AT 158 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES NORTH OF EAGLE LAKE...MOVING NORTHEAST AT
35 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 40 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SEALY...EAGLE LAKE...BROOKSHIRE...SAN FELIPE...AND PATTISON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2996 9606 2972 9591 2956 9634 2972 9644
TIME...MOT...LOC 0658Z 241DEG 28KT 2969 9631

40

Special weather statement, May 10, 2:21 AM CDT, 1 hour 57 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
221 AM CDT FRI MAY 10 2013

TXZ199-212-213-100800-
HARRIS TX-WALLER TX-MONTGOMERY TX-
221 AM CDT FRI MAY 10 2013

...SIGNIFICANT WEATHER ADVISORY...

AT 217 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS 8 MILES SOUTH OF WALLER TO NEAR STAGECOACH...
MOVING NORTHEAST AT 30 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 30 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
TOMBALL...BROOKSHIRE...WALLER...PATTISON AND STAGECOACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3025 9558 2997 9540 2976 9595 2998 9608
TIME...MOT...LOC 0717Z 243DEG 27KT 2994 9590

40

Special weather statement, May 10, 3:41 AM CDT, 37 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
May 9, 7:04 PM CDT	Severe Thunderstorm Warning	HGX	Montgomery, Polk, San Jacinto, Walker	41 min
May 9, 7:24 PM CDT	Severe Thunderstorm Warning	HGX	Polk, Trinity	36 min
May 9, 7:36 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto	39 min
May 9, 9:11 PM CDT	Special Weather Statement	HGX	Grimes	49 min
May 9, 9:21 PM CDT	Areal Flood Advisory	HGX	Grimes, Madison, Polk, San Jacinto, Trinity, Walker	114 min
May 9, 11:17 PM CDT	Areal Flood Advisory	HGX	San Jacinto, Trinity, Walker	58 min
May 10, 1:11 AM CDT	Special Weather Statement	HGX	Colorado	34 min
May 10, 1:25 AM CDT	Special Weather Statement	HGX	Austin	35 min
May 10, 1:52 AM CDT	Special Weather Statement	HGX	Harris	38 min
May 10, 1:55 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Harris	35 min
May 10, 2:01 AM CDT	Special Weather Statement	HGX	Austin	29 min
May 10, 2:21 AM CDT	Special Weather Statement	HGX	Waller	39 min
May 10, 2:31 AM CDT	Severe Thunderstorm Warning	HGX	Chambers, Harris, Liberty	44 min
May 10, 2:44 AM CDT	Areal Flood Advisory	HGX	Brazoria, Chambers, Fort Bend, Harris, Liberty	2 hr
May 10, 2:47 AM CDT	Special Marine Warning	HGX		88 min
May 10, 3:13 AM CDT	Flash Flood Warning	HGX	Harris	2 hr
May 10, 3:41 AM CDT	Special Weather Statement	HGX	Chambers	34 min
May 10, 8:29 AM CDT	Special Weather Statement	HGX	Austin	31 min
May 10, 8:32 AM CDT	Special Weather Statement	HGX	Austin, Waller	43 min
May 10, 8:53 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Waller	37 min
May 10, 9:01 AM CDT	Special Weather Statement	HGX	Brazos	44 min
May 10, 9:09 AM CDT	Special Weather Statement	HGX	Colorado	51 min
May 10, 9:18 AM CDT	Special Weather Statement	HGX	Fort Bend	42 min
May 10, 9:34 AM CDT	Special Weather Statement	HGX	Wharton	41 min
May 10, 9:43 AM CDT	Severe Thunderstorm Warning	HGX	Colorado, Jackson, Wharton	32 min
May 10, 9:49 AM CDT	Areal Flood Advisory	HGX	Austin, Colorado, Fort Bend, Harris, Waller, Wharton	116 min
May 10, 9:54 AM CDT	Severe Thunderstorm Warning	HGX	Harris, Liberty	36 min
May 10, 10:02 AM CDT	Flash Flood Warning	HGX	Austin, Fort Bend, Harris, Waller	3 hr
May 10, 10:02 AM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris	28 min
May 10, 10:11 AM CDT	Special Weather Statement	HGX	Wharton	49 min
May 10, 10:32 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend	28 min
May 10, 10:38 AM CDT	Tornado Warning	HGX	Brazoria, Fort Bend	37 min
May 10, 10:55 AM CDT	Special Marine Warning	HGX		95 min
May 10, 10:58 AM CDT	Special Weather Statement	HGX	Chambers	47 min
May 10, 11:00 AM CDT	Special Marine Warning	HGX		90 min
May 10, 11:05 AM CDT	Tornado Warning	HGX	Brazoria, Galveston	25 min
May 10, 11:07 AM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris, Matagorda, Wharton	3 hr
May 10, 11:19 AM CDT	Special Weather Statement	HGX	Brazoria, Matagorda	41 min
May 10, 11:25 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Chambers, Galveston, Harris	50 min
May 10, 11:38 AM CDT	Special Marine Warning	HGX		37 min
May 10, 11:43 AM CDT	Special Weather Statement	HGX	Chambers	47 min
May 10, 11:46 AM CDT	River Flood Warning	HGX	Harris	139 days
May 10, 12:17 PM CDT	Special Marine Warning	HGX		58 min
May 10, 1:22 PM CDT	Special Marine Warning	HGX		38 min
May 10, 1:30 PM CDT	Special Marine Warning	HGX		30 min
May 10, 1:37 PM CDT	Special Weather Statement	HGX	Chambers	23 min
May 10, 2:26 PM CDT	Special Marine Warning	HGX		49 min
May 10, 2:29 PM CDT	Small Craft Advisory	HGX		91 min
May 10, 3:18 PM CDT	Special Marine Warning	HGX		42 min

Nearby

Flash Flood Watches in Texas, 2013 Every flash flood watch in 2013

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.