A severe thunderstorm developed during afternoon peak heating and produced strong and damaging winds.
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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.
A severe thunderstorm developed during afternoon peak heating and produced strong and damaging winds.
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 Sep 21, 2:09 PM CST, 1 hour 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 309 PM CDT MON SEP 21 2009 .DISCUSSION... THIS WEEK IS SHAPING UP TO POSSIBLY BE A WET AND COOL WEEK. THE ATMOSPHERE SEEMS PRIMED TO GO FOR THUNDERSTORMS AND POSSIBLY LOCALLY HEAVY RAINFALL. DEEP MOISTURE REMAINS OVER SE TX WITH PRECIP WATER OVER 2 INCHES. A COLD FRONT IS CURRENTLY WORKING THROUGH THE TX PANHANDLE AND THEN INTO N TX LATER TONIGHT. DEEP UPPER LEVEL TROUGH OVER THE C PLAINS IS IN THE PROCESS OF CLOSING OFF PER WATER VAPOR IMAGERY. THE LATEST NAM/GFS/ECMWF SEEMED TO HAVE INITIALIZED WELL ENOUGH TO RESOLVE THESE FEATURES AND TRENDS. TUESDAY SHOULD BE A WET DAY AS THE FRONT PUSHES INTO THE AREA AND OFF THE COAST LATE TUE NIGHT. RAISED RAIN CHANCES TO 80 PERCENT AS IT IS HARD TO SEE HOW IT WILL BE POSSIBLE FOR NO ONE TO GET RAIN. DEEP MOISTURE...STRONG LIFT WITH THE FRONT AND SOME INSTABILITY ALL POINT TO WIDE SPREAD THUNDERSTORM ACTIVITY WITH A WEAK CAP. THE MAIN HAZARD FOR TOMORROW WILL BE HEAVY RAINFALL AS INSTABILITY WILL BE MARGINAL ENOUGH FOR A SEVERE THREAT. THE FRONT SHOULD STALL OFF THE COAST BY WED AND WITH STRONG SW FLOW ALOFT...SHOULD GET ISENTROPIC LIFT AND ELEVATED CONVECTION DURING THE DAY. PRECIP CHANCES WERE INCREASED TO THE 60/70 PERCENT RANGE MAINLY ALONG THE COAST FOR WED. FRONT WILL LIKELY NOT MOVE MUCH AS IT BECOMES PARALLEL TO THE MEAN FLOW ALOFT AND SUSPECT THAT WEAK ISENTROPIC LIFT WILL CONTINUE THROUGH THE END OF THE WEEK. AS SUCH...POPS WILL CONTINUE IN THE 40/50 PERCENT RANGE FOR THU/FRI. HEAVY RAINFALL MAY BE POSSIBLE WED BUT MUCH MORE LOCALIZED LATER IN THE WEEK. TEMPERATURES WILL BE QUITE COOL AS WELL GIVEN THE MODIFIED POST FRONTAL AIRMASS AND RAIN COOLED AIR. TEMPS DO GRADUALLY WARM TOWARDS THE WEEKEND BUT WILL KEEP MAX TEMPS A COUPLE OF DEGREES BELOW GUIDANCE GIVEN POSSIBLY MORE CLOUD COVER HANGING AROUND THE AREA WITH THE STALLED FRONT. WEEKEND UPCOMING LOOKS DRIER AS BOTH THE GFS/ECMWF ARE IN BETTER AGREEMENT WITH BRINGING THE CLOSED LOW ACROSS THE PLAINS FRI/SAT. RAIN CHANCES MAY LINGER SOME ON SAT/SUN BUT SHOULD SEE AN END TO PRECIP ON SUN NIGHT AT THE LATEST. BY THIS TIME THE TROUGH WILL HAVE MOVED WELL EAST AND UPPER LEVEL RIDGING BEGINS TO BUILD. THIS AGAIN WILL LIKELY SUPPORT NEAR NORMAL TEMPS WITH MAX TEMPS IN THE UPPER 80S. && .MARINE... LIGHT TO MODERATE ONSHORE WINDS WILL PERSIST AHEAD OF A COLD FRONT THAT WILL PUSH ACROSS SOUTHEAST TEXAS DURING THE DAY ON TUESDAY AND CLOSE TO OR OFF THE COAST TUESDAY EVENING. SHOWER AND THUNDERSTORM COVERAGE IS EXPECTED TO INCREASE NEAR THE FRONT AS IT STALLS SOMEWHERE NEAR THE COAST OR OVER THE COASTAL WATERS. WILL GENERALLY SEE NORTH TO NORTHEAST WINDS BEHIND THE FRONT WITH SPEEDS AT 10 TO 15 KNOTS TUESDAY NIGHT THROUGH THURSDAY...THEN DIMINISHING TO 5 TO 10 KNOTS THURSDAY NIGHT THROUGH SATURDAY NIGHT. SEAS SHOULD INCREASE TO 2 TO 4 FEET TUESDAY NIGHT THROUGH THURSDAY NIGHT THEN DIMINISH TO 1 TO 2 FEET AS WE HEAD ON INTO THE WEEKEND. ONSHORE WINDS SHOULD HOLD OFF UNTIL MAYBE THE START OF NEXT WEEK. 42 && .PRELIMINARY POINT TEMPS/POPS... COLLEGE STATION (CLL) 75 82 65 79 67 / 30 80 50 50 40 HOUSTON (IAH) 75 85 69 79 69 / 20 80 60 70 40 GALVESTON (GLS) 79 86 73 81 75 / 20 70 70 70 50 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...NONE. GM...NONE. && DISCUSSION...39 AVIATION/MARINE...42
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 319 PM CDT MON SEP 21 2009 GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226- 227-235>238-222030- AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND- GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY- MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO- TRINITY-WALKER-WALLER-WASHINGTON- 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-WHARTON- 319 PM CDT MON SEP 21 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORM ACTIVITY IS EXPECTED TO INCREASE LATE TONIGHT INTO TUESDAY MORNING AS A COLD FRONT PUSHES INTO THE REGION. A LINE OF THUNDERSTORMS WILL LIKELY PUSH INTO THE REGION TOWARDS SUNRISE. THE MAIN THREAT FROM THESE STORMS WILL BE GUSTY WINDS AND HEAVY RAINFALL. THUNDERSTORMS SHOULD REMAIN BELOW SEVERE LIMITS. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE FROM SOME OF THE STRONGER OR SLOWER MOVING STORMS. SOME AREAS COULD SEE RAINFALL AMOUNTS OF 1 INCH OR MORE. .DAYS TWO THROUGH FIVE...TUESDAY THROUGH FRIDAY THE FRONTAL BOUNDARY WILL CONTINUE TO MOVE INTO SOUTHEAST TEXAS TUESDAY BRINGING A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS TO THE REGION. THE FRONT IS EXPECTED TO STALL SOMEWHERE BETWEEN THE HIGHWAY 59 CORRIDOR AND 30 MILES OFFSHORE ON WEDNESDAY. OVERRUNNING MOISTURE AND A SERIES OF UPPER LEVEL DISTURBANCES WILL CONTINUE MOVING OVER SOUTHEAST TEXAS THROUGH FRIDAY TRIGGERING PERIODS OF RAINFALL. THERE APPEARS TO BE AN INCREASING THREAT FOR SOME LOCALLY HEAVY RAINFALL...MAINLY WHERE STRONGER STORMS TRAIN ACROSS THE SAME AREAS. ALTHOUGH THERE IS STILL QUITE A BIT OF UNCERTAINTY IN THE FORECAST...RAINFALL ACCUMULATIONS BETWEEN 1 AND 3 INCHES SHOULD BE EXPECTED THROUGH FRIDAY...WITH LOCALIZED HIGHER AMOUNTS POSSIBLE. .DAYS SIX AND SEVEN...SATURDAY AND SUNDAY DRIER CONDITIONS ARE EXPECTED SO THE HEAVY RAINFALL THREAT SHOULD COME TO AN END. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TUESDAY.
The Houston radar (KHGX), 66 km away, was scanning. The volume nearest the first event began at 20:58 UTC.
1 thunderstorm wind, 1 lightning. Local standard time, as filed.
Thunderstorm winds downed a tree and knocked over some street signs.
Lightning struck a home in Kingwood and caused extensive damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2009Every state in 2009This day in weather historyWarnings in Texas, September 2009
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: 189896, 189903.