Alert archive / Texas / Special Weather Statements in 2012

Special Weather Statement, NWS Houston/Galveston, TX

July 13, 2012Brazoria County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Jul 13, 2012, 3:12 PM CDT for Brazoria County, Texas. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 13, 2012, 3:12 PM CDT (20:12 UTC)
Expired: Jul 13, 2012, 4:00 PM CDT
In force: 48 min
Issued by: NWS Houston/Galveston, TX

County Brazoria County, TX

The radar

The Houston radar (KHGX), 76 km from the middle of the area, began a volume at 20:15 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 12:00Z, 8.2 hours before the alert went out and 269 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: 1723 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 13, 10:53 AM CDT, 4 hours 19 minutes earlier.

Area forecast discussion, Jul 13, 10:53 AM CDT, 4 hours 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1053 AM CDT FRI JUL 13 2012

.UPDATE...
THE UPPER LEVEL WEAKNESS THAT HAS BEEN OVERHEAD THE PAST COUPLE OF
DAYS HAS SHIFTED SLIGHTLY TO THE EAST THIS MORNING CARRYING THE
HEAVIEST PRECIPITATION INTO EAST TEXAS AND WESTERN LOUISIANA.
WHILE THE BULK OF THE PRECIPITATION LIES TO OUR EAST SCATTERED
SHOWERS AND THUNDERSTORMS ARE INCREASING IN COVERAGE ALONG THE
INTERSTATE 10 CORRIDOR AND THE TREND OF INCREASING COVERAGE IS
EXPECTED TO CONTINUE THROUGH THE AFTERNOON. FORTUNATELY THE
EARLIER ACTIVITY IN NORTHERN WALLER AND EXTREME NORTHWESTERN
HARRIS COUNTY HAS DISSIPATED BUT WE WILL HAVE TO CONTINUE TO WATCH
THIS AND OTHER AREAS THAT HAVE SEEN THE HEAVIER RAINFALL TOTALS
FOR ANY ADDITIONAL RAINS THAT COULD PROLONG THE CURRENT FLOODING
ISSUES.

FOR THE GRIDS...HAVE EXTENDED THE LIKELY POPS WESTWARD ALONG THE
I-10 CORRIDOR FOR THE AFTERNOON AND LOWERED POPS SLIGHTLY FOR OUR
NORTHEASTERN COUNTIES. ONLY OTHER CHANGES WERE SOME MINOR
ADJUSTMENTS TO THE MAX TEMPS FOR TODAY. 38

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      90  74  90  73  92 /  50  30  40  20  40
HOUSTON (IAH)              88  74  90  73  91 /  60  30  40  20  40
GALVESTON (GLS)            87  82  88  82  89 /  50  30  40  20  40

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH UNTIL 1 PM CDT THIS AFTERNOON FOR THE
     FOLLOWING ZONES: AUSTIN...BRAZORIA...CHAMBERS...COLORADO...
     FORT BEND...GALVESTON...HARRIS...JACKSON...LIBERTY...
     MATAGORDA...MONTGOMERY...POLK...SAN JACINTO...WALLER...
     WHARTON.

GM...NONE.
&&

DISCUSSION...38
AVIATION/MARINE...41

Hazardous weather outlook, Jul 13, 6:43 AM CDT, 8 hours 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
643 AM CDT FRI JUL 13 2012

TXZ178-179-197-199-200-210>214-226-227-235>238-141145-
AUSTIN-BRAZORIA-CHAMBERS-COLORADO-FORT BEND-GALVESTON-HARRIS-
JACKSON-LIBERTY-MATAGORDA-MONTGOMERY-POLK-SAN JACINTO-WALLER-
WASHINGTON-WHARTON-
643 AM CDT FRI JUL 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

A FLASH FLOOD WATCH IS IN EFFECT THROUGH 1 PM. SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER
SOUTHEAST TEXAS THIS MORNING. AN UPPER LEVEL FEATURE OVER THE
PINEY WOODS SHOULD HELP FOCUS MUCH OF THE HEAVIER PRECIPITATION
OVER EAST TEXAS AND SOUTHWEST LOUISIANA. RAINFALL AMOUNTS ARE
EXPECTED TO REMAIN BETWEEN 1 AND 2 INCHES TODAY WITH LOCALLY
HEAVIER AMOUNTS POSSIBLE...MAINLY EAST OF I-45.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY INTO
EARLY NEXT WEEK. THE GROUND IS INCREASINGLY SATURATED AND HEAVY
RAINS COULD PRODUCE LOCALIZED FLOODING.

.SPOTTER INFORMATION STATEMENT...

EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD BE ALERT FOR
ACTIVATION.

TXZ163-164-176-177-195-196-198-141145-
BRAZOS-BURLESON-GRIMES-HOUSTON-MADISON-TRINITY-WALKER-
643 AM CDT FRI JUL 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS
MORNING. ALTHOUGH ORGANIZED HEAVY RAIN IS NOT EXPECTED...A FEW OF
THE STRONGER STORMS COULD PRODUCE A QUICK INCH OR TWO OF RAIN.
MOST AREAS WILL RECEIVE RAINFALL ACCUMULATIONS OF LESS THAN AN
INCH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY INTO
EARLY NEXT WEEK. THE GROUND IS INCREASINGLY SATURATED AND HEAVY
RAINS COULD PRODUCE LOCALIZED FLOODING.

.SPOTTER INFORMATION STATEMENT...

EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD BE ALERT FOR
ACTIVATION.

In the hours before

Local storm report, Jul 13, 2:08 PM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
208 PM CDT FRI JUL 13 2012

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

1200 PM     FLOOD            HOUSTON                 29.77N 95.39W
07/13/2012                   HARRIS             TX   COUNTY OFFICIAL

            HIGH WATER BLOCKING ONE LANE OF INTERSTATE 45 AT THE

            INTERSECTION WITH SCOTT STREET SOUTH OF DOWNTOWN HOUSTON.

1200 PM     FLOOD            HOUSTON                 29.77N 95.39W
07/13/2012                   HARRIS             TX   COUNTY OFFICIAL

            SEVERAL LANES OF INTERSTATE 45 AND INTERSTATE 10 NORTH
            AND EAST OF DOWNTOWN ARE IMPASSABLE DUE TO HIGH WATER.

0100 PM     FLOOD            10 NW JERSEY VILLAGE    29.97N 95.70W
07/13/2012                   HARRIS             TX   COUNTY OFFICIAL

            WATER REPORTED IN 25-50 HOMES ACROSS NORTHERN HARRIS
            COUNTY. AT LEAST 30 HIGH WATER RESCUES REPORTED.

0100 PM     FLOOD            SPRING                  30.06N 95.38W
07/13/2012                   HARRIS             TX   COUNTY OFFICIAL

            WATER REPORTED IN 8-10 HOMES IN SOUTHERN MONTGOMERY
            COUNTY NEAR SPRING CREEK.

0100 PM     FLOOD            2 NE HEMPSTEAD          30.11N 96.06W
07/13/2012                   WALLER             TX   COUNTY OFFICIAL

            WATER REPORTED IN SEVERAL HOMES.

&&

PKUHN

Special weather statement, Jul 13, 3:12 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
312 PM CDT FRI JUL 13 2012

TXZ236-237-132100-
MATAGORDA TX-BRAZORIA TX-
312 PM CDT FRI JUL 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MATAGORDA AND
SOUTHWESTERN BRAZORIA COUNTIES UNTIL 400 PM CDT...

AT 311 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A STRONG THUNDERSTORM NEAR BRAZORIA...OR 7 MILES
SOUTHEAST OF SWEENY...MOVING WEST AT 15 MPH.

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

LOCATIONS IMPACTED INCLUDE...
LAKE JACKSON...CLUTE...WEST COLUMBIA...SWEENY...RICHWOOD...
BRAZORIA...WILD PEACH VILLAGE...JONES CREEK AND BAILEY'S PRAIRIE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 2899 9589 2917 9585 2923 9558 2905 9537
      2890 9538 2888 9581
TIME...MOT...LOC 2011Z 101DEG 14KT 2900 9558

#!KP!

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 3:11 AM CDT	River Flood Warning	HGX	Harris, Montgomery	3 days
Jul 13, 5:34 AM CDT	River Flood Warning	HGX	Harris, Montgomery	4 hr
Jul 13, 5:34 AM CDT	River Flood Warning	HGX	Harris, Liberty	4 hr
Jul 13, 9:01 AM CDT	River Flood Warning	HGX	Brazoria	26 hr
Jul 13, 9:56 AM CDT	Areal Flood Advisory	HGX	Harris, Waller	2 hr
Jul 13, 11:20 AM CDT	River Flood Warning	HGX	Harris	23 hr
Jul 13, 11:24 AM CDT	Areal Flood Advisory	HGX	Harris, Waller	111 min
Jul 13, 11:43 AM CDT	Flash Flood Warning	HGX	Chambers, Harris, Liberty, Montgomery, Waller	3 hr
Jul 13, 1:07 PM CDT	Areal Flood Advisory	HGX	Harris, Liberty, Montgomery, San Jacinto	53 min
Jul 13, 1:16 PM CDT	Special Marine Warning	HGX		44 min
Jul 13, 2:06 PM CDT	Areal Flood Advisory	HGX	Grimes, Montgomery, Walker	114 min
Jul 13, 3:20 PM CDT	Special Weather Statement	HGX	Colorado	40 min
Jul 13, 3:25 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado	35 min
Jul 13, 3:53 PM CDT	Areal Flood Advisory	HGX	Austin, Colorado, Wharton	66 min
Jul 13, 4:20 PM CDT	Areal Flood Advisory	HGX	Austin, Fort Bend, Waller, Washington	55 min
Jul 13, 4:45 PM CDT	Special Weather Statement	HGX	Fort Bend	45 min
Jul 13, 4:56 PM CDT	Areal Flood Advisory	HGX	Austin, Fort Bend, Waller, Wharton	64 min
Jul 13, 5:27 PM CDT	Flash Flood Warning	HGX	Austin, Fort Bend, Harris, Waller	2 hr
Jul 13, 5:43 PM CDT	Special Weather Statement	HGX	Waller	47 min
Jul 13, 6:09 PM CDT	Special Weather Statement	HGX	Wharton	51 min

Nearby

Special Weather Statements in Texas, 2012 Every special weather statement in 2012

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.