Strong outflow winds from a thunderstorm caused the deaths of two teenage boys at Lake Lewisville.
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 FWD wrote it up.
Strong outflow winds from a thunderstorm caused the deaths of two teenage boys at Lake Lewisville.
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 Fort Worth, TX wrote its last area forecast discussion before the first event at Jul 1, 1:47 PM CST, 2 hours 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FORT WORTH TX 247 PM CDT SUN JUL 1 2012 .DISCUSSION... THE UPPER LEVEL LOW IS NOW CENTERED NEAR MONTERREY MEXICO IN NORTHEAST MEXICO. DEEP SOUTH-SOUTHEAST FLOW AVERAGING 15 TO 20 KTS CAN BE SEEN ON AREA PROFILERS UP TO BETWEEN 500 AND 600 MILLIBARS. THE DEEP TROPICAL PLUME HAS RESULTED IN PRECIPITABLE WATER VALUES APPROACHING TWO INCHES ACROSS THE REGION. MOIST ADIABATIC LAPSE RATES ALOFT HAVE RESULTED IN ACTIVITY BEING MORE IN THE FORM OF SHOWERS THAN THUNDERSTORMS ACROSS OUR SOUTHERN AND EASTERN COUNTIES THIS AFTERNOON. WE EXPECT THIS ACTIVITY TO CONTINUE MOVING NORTH TOWARD THE I-20 CORRIDOR THROUGH THIS EVENING WITH BEST RAIN CHANCES SOUTH OF I-20 WHERE THE RICHEST MOISTURE RESIDES. BULK OF THIS ACTIVITY SHOULD START TO DIMINISH IN COVERAGE AS WE APPROACH NIGHTFALL. IF YOU ARE LUCKY ENOUGH TO GET UNDERNEATH ANY OF THIS ACTIVITY...BRIEF HEAVY RAINFALL WITH TOTALS BETWEEN A QUARTER AND HALF OF AN INCH IS POSSIBLE WITH THE TROPICAL AIRMASS IN PLACE. DURATION OF HEAVIER RAINS SHOULD BE SHORT AND ARE NOT EXPECTING ANYTHING WORSE THAN BRIEF STREET FLOODING...UNLESS TRAINING OF ACTIVITY WAS TO OCCUR. THE RICHER MOISTURE WILL POOL OVER THE RED RIVER VALLEY AND ARKLATEX REGION OVERNIGHT AND INTO MONDAY...AS DRIER AIR ACROSS WESTERN TEXAS ENTRAINS INTO THE SOUTHWEST COUNTIES. WE WILL CONTINUE ADVERTISING LOW RAIN CHANCES ACROSS NORTHERN AND EASTERN COUNTIES ON MONDAY WHERE A MID LEVEL DEFORMATION ZONE SETS UP NORTHEAST OF THE UPPER LOW OVER MEXICO AND TO THE WEST OF THE SOUTHEAST U.S UPPER HIGH. BOTH OF THESE FEATURES WILL MOVE FURTHER AWAY FROM NORTH TEXAS TUESDAY WITH BROAD UPPER HIGH EXPANDING AND STRENGTHENING ACROSS THE SOUTHERN PLAINS. HOT AND DRY CONDITIONS WILL RETURN TO THE AREA WITH HIGH TEMPERATURES NEAR 100 DEGREES FROM INDEPENDENCE DAY THROUGH NEXT WEEKEND. STEADY SOUTH BREEZES 10 TO 15 MPH WILL OCCUR EACH AFTERNOON...BUT OFFER LITTLE RELIEF FROM THE HEAT. 05/ && .PRELIMINARY POINT TEMPS/POPS... DALLAS-FT. WORTH, TX 76 94 77 98 78 / 20 20 5 5 5 WACO, TX 76 95 76 98 77 / 20 10 5 10 5 PARIS, TX 73 92 74 97 75 / 20 30 10 5 5 DENTON, TX 74 93 75 98 76 / 20 20 5 5 5 MCKINNEY, TX 74 93 74 97 76 / 20 20 5 5 5 DALLAS, TX 77 94 78 97 79 / 20 20 5 5 5 TERRELL, TX 74 94 75 96 76 / 20 20 10 5 5 CORSICANA, TX 74 93 75 98 76 / 20 20 5 10 5 TEMPLE, TX 75 93 74 98 76 / 20 10 5 10 5 MINERAL WELLS, TX 74 94 73 98 77 / 20 10 5 5 5 && .FWD WATCHES/WARNINGS/ADVISORIES... NONE. && 05/
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE FORT WORTH TX 249 PM CDT SUN JUL 1 2012 TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-021145- MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN- HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS- ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL- JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO- FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE- LEON-MILAM-ROBERTSON- 249 PM CDT SUN JUL 1 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS ACROSS MUCH OF NORTH TEXAS THROUGH THE EVENING HOURS WITH BEST CHANCES GENERALLY SOUTH OF A GOLDTHWAITE...FORT WORTH...EMORY LINE. LOCALLY HEAVY RAINFALL AND CLOUD TO GROUND LIGHTNING WILL BE THE PRIMARY THREATS WITH ANY STORMS TODAY. OVERNIGHT...THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS NORTHEAST OF A LINE FROM GAINESVILLE TO ROCKWALL TO ATHENS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE IS A CHANCE OF THUNDERSTORMS ALONG AND NORTHEAST OF A LINE FROM GRAHAM TO DALLAS TO CENTERVILLE ON MONDAY. LOCALLY HEAVY RAINFALL AND CLOUD TO GROUND LIGHTNING WILL BE THE MAIN THREATS WITH ANY STORMS THAT DEVELOP. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. 82/JLD
The Dallas/Ft Worth radar (KFWS), 63 km away, was scanning. The volume nearest the first event began at 22:23 UTC.
1 thunderstorm wind. Local standard time, as filed.
Two teenage brothers drowned at Lake Lewisville after 40 MPH outflow winds moved across the lake. The boys were swimming at the time and one brother was swept out due to the strong winds. The other went out to help him. Both boys were recovered that evening by dive teams.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Thunderstorm Wind, Denton | 2012-07-01 | 15 | Male | In Water | Direct |
| Thunderstorm Wind, Denton | 2012-07-01 | 17 | Male | In Water | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2012Every state in 2012This day in weather historyWarnings in Texas, July 2012
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: 403089.