Widespread showers and thunderstorms developed across the coastal areas of southeast Texas in response to a surge of tropical moisture associated with the passage of Hurricane Alex through the northwestern Gulf of Mexico and into northern Mexico. Training of thunderstorms developed over portions of Brazoria County leading to widespread damage from flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS HGX wrote it up.
Widespread showers and thunderstorms developed across the coastal areas of southeast Texas in response to a surge of tropical moisture associated with the passage of Hurricane Alex through the northwestern Gulf of Mexico and into northern Mexico. Training of thunderstorms developed over portions of Brazoria County leading to widespread damage from flash flooding.
The local office's own words before the first event, 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 the first event at Jul 1, 12:00 PM CST, 1 hour 25 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
100 PM CDT THU JUL 1 2010
.UPDATE...
18Z AVIATION UPDATE BELOW.
&&
.AVIATION...
GOES WITHOUT SAYING BUT...WITH REGION BEING UNDER THIS HIGHLY MOIST
TROPICAL AIR MASS...FORECAST IS FOR PREVAILING VCSH/VCTS AND MVFR
DECKS THROUGH PERIOD. DIFFICULT IN TIMING CONVECTIVE BAND MOVEMENT
SO WILL AMEND WHEN NECESSARY. IFR CONDITIONS WITHIN BANDS OF +(TS)RA
AS CEILINGS FALL BELOW 1K FT/VISBIES TO AROUND 1SM. MODEL ENSEMBLE
DEPICTS ANOTHER ROUND SIMILAR TO THE ONE THAT HAS EFFECTED THE SE
TX COAST THIS MORNING (3-5" OVER 6 HOURS)...BUT DISPLACING IT MORE
NORTH-SOUTH FROM THE ISLAND...THROUGH METRO DURING THURSDAY EVENING
TO EARLY FRIDAY MORNING HOURS. THIS IS MODERATELY PROBABLE SO HAVE
PROB30'ED AT LEAST RA AND THEN TEMPO'ED EARLY FRIDAY HEAVY RAIN BANDING.
ALL AND ALL...OTHER THAN EASTERLIES DYING OUT...EXPECT SIMILAR IFR/MVFR
CONDITIONS WITHIN THESE CONTINUED (TS)RA BANDS OF WHAT IS LEFT OF ALEX.
31
&&
.PREV DISCUSSION... /ISSUED 953 AM CDT THU JUL 1 2010/
UPDATE...
JUNE CLIMATE DATA
CLIMATE...
JUNE HAS COME TO AN END AND IT WAS A WARM MONTH FOR MOST OF
SOUTHEAST TEXAS. THE CITY OF HOUSTON RECORDED IT 6TH WARMEST JUNE
(TIE WITH 1953) WITH AN AVG TEMP OF 84.7 DEGREES. HOBBY AIRPORT
RECORDED ITS 5TH WARMEST JUNE (84.1 DEGREES) AND GALVESTON
RECORDED ITS 10TH WARMEST JUNE ON RECORD (83.9 DEGREES). COLLEGE
STATION DID NOT HAVE A TOP TEN WARMEST MONTH BUT IT DID HAVE ITS
9TH WETTEST JUNE ON RECORD (9.03 INCHES).
&&
PREV DISCUSSION... /ISSUED 919 AM CDT THU JUL 1 2010/
DISCUSSION...
DEEP TROPICAL MOISTURE LINGERS OVER SOUTHEAST TEXAS WITH PW VALUES
RANGING FROM 2.8 TO 2.4 INCHES. K INDEX VALUES ARE IN THE MID AND
UPPER 30S AND CONVECTIVE TEMPS ARE IN THE MID TO UPPER 80S. ALL
THE INGREDIENTS ARE IN PLACE FOR SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS. TRAINING HAS BEGUN TO SET UP OVER JACKSON...
MATAGORDA AND BRAZORIA COUNTIES AND THIS AREA RECEIVED 1 TO 3
INCHES OF RAIN YESTERDAY. HPC HAS PLACED THIS REGION IN EXCESSIVE
RAINFALL TODAY AND SATELLITE DERIVED PW SHOWS A PLUME OF HIGH
MOISTURE TARGETING THIS REGION. TONIGHT...A WEAK BOUNDARY IS
PROGGED TO MOVE SOUTH AND WILL LIKELY SERVE AS A FOCUS FOR
ADDITIONAL PRECIP. THAT SAID...FEEL A FLASH FLOOD WATCH IS
WARRANTED FOR THE SOUTHERN COUNTIES AS POTENTIAL FOR HEAVY RAIN IS
HIGH. OTHERWISE PREVIOUS FORECAST COVERS THE SITUATION WELL. 43
&&
.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL) 77 89 78 91 78 / 40 60 40 40 30
HOUSTON (IAH) 78 89 78 91 78 / 50 70 40 40 30
GALVESTON (GLS) 82 87 82 87 82 / 60 70 30 40 30
&&
.HGX WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR THE FOLLOWING ZONES:
BRAZORIA...FORT BEND...GALVESTON...JACKSON...MATAGORDA...
WHARTON.
COASTAL FLOOD WARNING UNTIL 7 AM CDT FRIDAY FOR THE FOLLOWING
ZONES: BRAZORIA...CHAMBERS...GALVESTON...HARRIS...JACKSON...
MATAGORDA.
GM...SMALL CRAFT ADVISORY UNTIL 7 AM CDT FRIDAY FOR THE FOLLOWING
ZONES: GALVESTON BAY...MATAGORDA BAY...WATERS FROM FREEPORT
TO THE MATAGORDA SHIP CHANNEL OUT 20 NM...WATERS FROM HIGH
ISLAND TO FREEPORT OUT 20 NM.
SMALL CRAFT SHOULD EXERCISE CAUTION FROM FRIDAY MORNING THROUGH
SATURDAY MORNING FOR THE FOLLOWING ZONES: GALVESTON BAY...
MATAGORDA BAY...WATERS FROM FREEPORT TO THE MATAGORDA SHIP
CHANNEL OUT 20 NM...WATERS FROM HIGH ISLAND TO FREEPORT OUT
20 NM.
SMALL CRAFT ADVISORY UNTIL 1 PM CDT SATURDAY FOR THE FOLLOWING
ZONES: WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL
20 NM TO 60 NM...WATERS FROM HIGH ISLAND TO FREEPORT 20 TO
60 NM.
&&
DISCUSSION...43
AVIATION/MARINE...31HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 941 AM CDT THU JUL 1 2010 TXZ163-164-176>179-195>200-210>214-020900- AUSTIN-BRAZOS-BURLESON-CHAMBERS-COLORADO-GRIMES-HARRIS-HOUSTON- LIBERTY-MADISON-MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WALLER- WASHINGTON- 941 AM CDT THU JUL 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS THE AREA AS THE DEEP TROPICAL AIR MASS REMAINS OVER SOUTHEAST TEXAS. SOME OF THE STRONGER THUNDERSTORMS WILL BE CAPABLE OF PRODUCING SOME LOCALLY HEAVY RAINS. IN ADDITION TO THE THREAT OF HEAVY RAINFALL ISOLATED FUNNEL CLOUDS AND TORNADOES WILL ALSO BE POSSIBLE DUE TO THE TROPICAL AIR MASS OVER THE AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY LINGERING TROPICAL MOISTURE WILL HELP TO KEEP A CHANCE OF RAIN IN THE FORECAST THROUGH THE WEEKEND FOR SOUTHEAST TEXAS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME GMZ330-335-350-355-370-375-020900- GALVESTON BAY-MATAGORDA BAY- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM- WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM- WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM- 941 AM CDT THU JUL 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT STRONG EAST WINDS WILL HELP MAINTAIN SEAS TO FROM 7 TO 10 FEET NEAR SHORE AND 11 TO 14 FEET OFFSHORE. PERIODS OF SHOWERS AND THUNDERSTORMS WILL PRODUCE BRIEF WIND GUSTS TO 35 KNOTS AND POSSIBLY A FEW WATERSPOUTS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. TXZ226-227-235>238-020900- BRAZORIA-FORT BEND-GALVESTON-JACKSON-MATAGORDA-WHARTON- 941 AM CDT THU JUL 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. ...FLOOD WATCH IN EFFECT THROUGH EARLY FRIDAY... .DAY ONE...TODAY AND TONIGHT SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE AREA AS A DEEP TROPICAL AIR MASS REMAINS OVER SOUTHEAST TEXAS. SOME OF THE STRONGER THUNDERSTORMS WILL BE CAPABLE OF PRODUCING SOME LOCALLY HEAVY RAINS. RAINFALL AMOUNTS OF 1 TO 3 INCHES FELL YESTERDAY OVER THE WATCH AREA AND ANOTHER 1 TO 3 INCHES OF RAIN IS EXPECTED TODAY. THE POTENTIAL EXISTS FOR ANOTHER 1 TO 3 INCHES OF RAIN OVERNIGHT. IN ADDITION TO THE THREAT OF HEAVY RAINFALL ISOLATED FUNNEL CLOUDS AND TORNADOES WILL ALSO BE POSSIBLE DUE TO THE TROPICAL AIR MASS OVER THE AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY LINGERING TROPICAL MOISTURE WILL HELP TO KEEP A CHANCE OF RAIN IN THE FORECAST THROUGH THE WEEKEND FOR SOUTHEAST TEXAS. .SPOTTER INFORMATION STATEMENT... EMERGENCY MANAGERS SHOULD PREPARE FOR HEAVY RAIN AND POSSIBLE FLOODING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 1021 AM CDT THU JUL 1 2010 TXZ226-227-236-237-011615- BRAZORIA-FORT BEND-MATAGORDA-WHARTON- 1021 AM CDT THU JUL 1 2010 ...SPECIAL WEATHER STATEMENT... AT 1019 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS NEAR SWEENY...MOVING NORTHWEST AT 20 MPH. FUNNEL CLOUDS...WITH BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IN THE PATH OF THIS STORM INCLUDE...DAMON...WEST COLUMBIA AND SWEENY. SEEK SHELTER IN A STURDY STRUCTURE OR AUTOMOBILE UNTIL THIS STORM HAS PASSED. LAT...LON 2913 9611 2943 9572 2904 9548 2887 9568 TIME...MOT...LOC 1520Z 133DEG 23KT 2903 9569
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1039 AM CDT THU JUL 1 2010
TXZ236-237-011615-
BRAZORIA-MATAGORDA-
1039 AM CDT THU JUL 1 2010
...SIGNIFICANT WEATHER ADVISORY...
AT 1036 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 5 MILES WEST OF ANGLETON...MOVING WEST AT 30 MPH.
FUNNEL CLOUDS...WINDS GREATER THAN 40 MPH...ARE POSSIBLE WITH THIS
STORM.
LOCATIONS IN THE PATH OF THIS STORM INCLUDE...WEST COLUMBIA...
SWEENY...BAILEY'S PRAIRIE AND ANGLETON.
GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE OR NON-CONVERTABLE
AUTOMOBILE UNTIL THIS STORM HAS PASSED.
LAT...LON 2928 9584 2930 9581 2931 9580 2922 9541
2904 9545 2903 9586
TIME...MOT...LOC 1539Z 105DEG 26KT 2919 9553The Houston radar (KHGX), 77 km away, was scanning. The volume nearest the first event began at 19:27 UTC.
3 flash flood. Local standard time, as filed.
Numerous roads were closed due to high water in and around Sweeny and West Columbia.
Heavy rainfall caused flooding of 30 to 35 homes in the town of Sweeny.
Heavy rainfall caused flooding of 40 to 45 homes and businesses in the town of West Columbia.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2010Every state in 2010This day in weather historyWarnings in Texas, July 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 238486, 238494, 238495.