An upper level disturbance produced showers and thunderstorms across portions of Deep South Texas. Locally heavy rainfall occurred across portions of the western counties.
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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 BRO wrote it up.
An upper level disturbance produced showers and thunderstorms across portions of Deep South Texas. Locally heavy rainfall occurred across portions of the western counties.
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 Brownsville, TX wrote its last area forecast discussion before the first event at Sep 9, 7:20 PM CST, 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BROWNSVILLE TX 820 PM CDT WED SEP 9 2009 .UPDATE...ACTIVE STRONG CONVECTION OVER STARR COUNTY WITH MERGING CELLS AND COOLING TOPS...POSSIBLE MCS DEVELOPING. RADAR ESTIMATES OF 2 TO 4 INCHES PER HOUR FROM HEAVIEST CELLS NEAR FALCON...EL SAUZ AND APPROACHING RIO GRANDE CITY. LITTLE MOVEMENT OR A NORTHEAST DRIFT OR REDEVELOPMENT OF THE THUNDERSTORMS IS NOTED. EARLIER CONVECTION WAS CONCENTRATED OVER THE THREE COASTAL COUNTIES WITH INITIATION TIME SHORTLY BEFORE 11 AM. EXPECT MORE OF THE SAME THROUGH THE WEEKEND. AS PREVIOUS DISCUSSION MENTIONS FRIDAY COULD BE THE WETTEST DAY WITH SATURDAY JUST AS WET. EVENING SOUNDING INDICATED THE PWAT AT 2.2 INCHES WITH FORECAST VALUES TO REMAIN BETWEEN 2 AND 2.4 INCHES. AS A SURFACE TROUGH AND POSSIBLE LOW PRESSURE AREA DEVELOPING OVER THE NEXT 24 TO 72 HOURS SHOWERS AND THUNDERSTORMS COULD BECOME MORE ORGANIZED OR CONCENTRATED. WEAK STEERING CURRENTS OR LIGHT WINDS ALOFT COULD POSE A THREAT TO FLASH FLOODING ANY TIME THROUGH SATURDAY. LATER SHIFTS WILL HAVE TO MONITOR RADAR AND MODEL TRENDS FOR POSSIBLE ISSUANCE OF A FLASH FLOOD WATCH FOR ANY GIVEN LOCATION IN THE RIO GRANDE VALLEY OR DEEP SOUTH TEXAS. CHANGES TO THE EVENING FORECAST INCLUDE POPS FOR MAINLY OUT WEST AND STARR COUNTY. NO OTHER CHANGES MADE. && .MARINE...AT 7 PM BUOY 20 REPORTED EAST WINDS AT 14 KNOTS WITH GUSTS TO 18 KNOTS AND SEAS AT 2 FEET WITH A 4 SECOND PERIOD. A WEAK PRESSURE GRADIENT WILL PREVAIL ACROSS THE COASTAL WATERS MAINTAINING LIGHT TO MODERATE EAST TO SOUTHEAST WINDS AND LOW SEAS ACROSS THE MARINE AREAS THROUGH THIS WEEKEND. A COASTAL TROUGH WILL DEVELOP ACROSS THE WESTERN GULF OF MEXICO IN THE NEXT FEW DAYS...MAINTAINING SHOWERS AND ISOLATED THUNDERSTORMS IN THE FORECAST. A WEAK COLD FRONT WILL MOVE INTO SOUTH TEXAS LATE THIS WEEKEND. THE LOW PRESSURE TROUGH AND FRONTAL BOUNDARY WILL CONTINUE PRODUCING SHOWERS AND ISOLATED THUNDERSTORMS ACROSS PORTIONS OF THE MARINE AREAS THROUGH EARLY NEXT WEEK. && .AVIATION...VFR CONDITIONS WITH MODERATE EASTERLY WINDS AND MOSTLY CLOUDY SKIES ARE OCCURRING AT THE REGIONAL AIRPORTS. THE WINDS WILL BECOME LIGHT AND VARIABLE TO CALM OVERNIGHT THEN LIGHT AND VARIABLE TO MODERATE FROM THE EAST TO SOUTHEAST ON THURSDAY. THERE IS A CHANCE FOR SHOWERS AND ISOLATED THUNDERSTORMS MOVING ACROSS PORTIONS OF THE CWA AT TIMES THE NEXT FEW DAYS. ANY SHOWERS OR THUNDERSTORMS MAY REDUCE CEILINGS AND/OR VISIBILITIES TO TEMPORARY MVFR OR IFR CONDITIONS. VFR TO TEMPORARY IFR CONDITIONS WILL PREVAIL ACROSS THE REGIONAL AIRPORTS DURING THE NEXT 24 HOURS. && .PREV DISCUSSION...ISSUED 144 PM CDT WED SEP 9 2009... DEEP MOISTURE SFC AND ALOFT REMAINS FIRMLY ENSCONCED ACROSS THE WHOLE OF TEXAS TODAY. MIDLEVEL LOW ROUGHLY CENTERED JUST NORTH OF SAN ANGELO CONTINUES TO PROVIDE MIDLEVEL INSTABILITY. INITIAL SHOWER ACTIVITY TODAY HAS BEEN TRIGGERED BY STREAMER SHOWERS MOVING IN FROM THE SOUTHWEST...BUT IS NOW BECOMING MORE OUTFLOW ORIENTED AS ACTIVITY BECOMES MORE WIDESPREAD. CONTINUED WITH LIKELY CHANCES TODAY...FALLING TO SLIGHT CHANCE OVERNIGHT MAINLY ALONG THE COAST DUE TO LOSS OF DAYTIME HEATING. ANOTHER ROUND OF SHOWER AND THUNDERSTORM ACTIVITY WILL COMMENCE AGAIN TOMORROW MORNING WITH LITTLE CHANGE TO ATMOSPHERIC CONDITIONS FROM TODAY. FRIDAY THINGS GET MORE MURKY. MODELS ARE ALL SIMILAR IN BRINGING A FRONTAL BOUNDARY INTO THE FAR NORTHWEST GULF BY FRIDAY MORNING. WHAT THE MODELS ARE DISSIMILAR ON IS SFC LOW PRESSURE DEVELOPING ON THAT LOW DURING THE DAY FRIDAY. ALL MODELS DO INDICATE A CLOSED SFC LOW WRAPPING UP...BUT ARE DIFFERING ON WHERE THIS HAPPENS...FROM AS FAR WEST AS COTULLA TO AS FAR EAST AS 100 MILES EAST OF CRP OVER THE NW GULF. NEEDLESS TO SAY...THE MODELS OVER WATER ARE TAPPING THE WARM GULF WATERS AND WRAPPING THIS INTO A SEMI-TROPICAL SYSTEM EJECTING BACK TO THE NORTH OVER THE WEEKEND. ANY OF THESE SCENARIOS WILL STILL BRING CONTINUED RAINFALL ACROSS THE REGION THROUGH THE WEEKEND...AND LIKELY INTO NEXT WEEK. THE BEST TIME FOR WIDESPREAD RAIN WILL BE FRIDAY AS THE LOW DEEPENS TO THE NORTH. WILL KEEP A SHARP EYE ON THIS FEATURE FOR MODEL AGREEMENT. MARINE...A WEAK PRESSURE GRADIENT WILL PREVAIL ACROSS THE NORTH GULF AS HIGH PRESSURE REMAINS THE OVERARCHING SYNOPTIC FEATURE IN THE SHORT TERM. A COASTAL TROUGH WILL PLAY A MORE SIGNIFICANT ROLE LOCALLY THOUGH... KEEPING SHOWERS AND THUNDERSTORMS IN THE FORECAST FOR THE NEXT FEW DAYS. THE MODELS ARE NOT TOGETHER ON THE EXACT EVOLUTION OF THE TROUGH...VARYING SOMEWHAT IN AREAS AND AMOUNTS OF RAIN AS WELL AS IN WINDS AND SEAS. ANOTHER COMPLICATION IS THE POTENTIAL DEVELOPMENT OF A LOW PRESSURE AREA IN THE WEST GULF IN THE NEXT TWO TO THREE DAYS. SEAS FAR OFFSHORE THEN HAVE THE POTENTIAL TO BUILD BRIEFLY TO 4 OR 5 FEET AS WINDS BEYOND 60 MILES OFFSHORE INTENSIFY. SEAS WITHIN THE OUTER MARINE ZONES MAY BUILD ON SATURDAY...BUT THERE IS STILL LOW CONFIDENCE ON THE DEVELOPMENT OF ANY SURFACE LOW. THE FORECAST WILL REFLECT HIGHER SEAS THAN IN RECENT DAYS AFTER FRIDAY BUT ADVISORIES ARE NOT EXPECTED. && .PRELIMINARY POINT TEMPS/POPS... BAYVIEW/PORT ISABEL 78 90 76 88 / 20 60 40 80 BROWNSVILLE 77 90 76 90 / 20 70 40 80 HARLINGEN 76 92 75 91 / 20 70 40 80 MCALLEN 78 93 76 93 / 40 70 40 80 RIO GRANDE CITY 75 93 75 93 / 80 70 40 70 SOUTH PADRE ISLAND 79 87 77 89 / 20 60 40 80 && .BRO WATCHES/WARNINGS/ADVISORIES... TX...NONE. GM...NONE. && THIS PRODUCT IS ALSO AVAILABLE ON THE WEB AT: HTTP://WWW.WEATHER.GOV/BROWNSVILLE 59/63
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BROWNSVILLE TX 445 AM CDT WED SEP 9 2009 TXZ248>257-101130- ZAPATA-JIM HOGG-BROOKS-KENEDY-STARR-HIDALGO-INLAND WILLACY- INLAND CAMERON-COASTAL WILLACY-COASTAL CAMERON- 445 AM CDT WED SEP 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR DEEP SOUTH TEXAS. .DAY ONE...TODAY AND TONIGHT. SLOW MOVING SHOWERS AND THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL AND MINOR FLOODING THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. DAILY SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS WEEK...WITH THE MAIN THREAT BEING LOCALLY HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. GMZ130-132-135-150-155-170-175-101130- LAGUNA MADRE FROM THE PORT OF BROWNSVILLE TO THE ARROYO COLORADO- LAGUNA MADRE FROM THE ARROYO COLORADO TO 5 NM NORTH OF PORT MANSFIELD TX- LAGUNA MADRE FROM 5 NM NORTH OF PORT MANSFIELD TO BAFFIN BAY TX- COASTAL WATERS FROM PORT MANSFIELD TO THE RIO GRANDE OUT 20 NM- COASTAL WATERS FROM BAFFIN BAY TO PORT MANSFIELD OUT 20 NM- WATERS FROM PORT MANSFIELD TO THE RIO GRANDE EXTENDING FROM 20 TO 60 NM- WATERS FROM BAFFIN BAY TO PORT MANSFIELD EXTENDING FROM 20 TO 60 NM- 445 AM CDT WED SEP 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE GULF OF MEXICO AND THE LAGUNA MADRE. .DAY ONE...TODAY AND TONIGHT. MARINE SHOWERS AND THUNDERSTORMS WILL PRODUCE GUSTY WINDS AND HIGHER SEAS ON OPEN WATERS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. MARINE SHOWERS AND THUNDERSTORMS WILL PRODUCE GUSTY WINDS AND HIGHER SEAS ON OPEN WATERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. 65
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BROWNSVILLE TX 726 PM CDT WED SEP 9 2009 TXZ252-100115- STARR- 726 PM CDT WED SEP 9 2009 ...A STRONG THUNDERSTORM WILL AFFECT SOUTH WESTERN STARR COUNTY... ...MOVING SOUTHEAST AT 5 MPH...WILL AFFECT FALCON HEIGHTS AND SOUTHWESTERN STARR COUNTY...UNTIL 815 PM CDT. GUSTY WINDS UP TO 40 MPH WILL OCCUR. FREQUENT CLOUD TO GROUND LIGHTNING IS EXPECTED. IF CAUGHT OUTSIDE...CROUCH DOWN IN A LOW SPOT...AWAY FROM TALL OBJECTS. RAINFALL RATES OF 2 TO 3 INCHES PER HOUR WILL OCCUR. MOTORISTS CAN EXPECT PONDING OF WATER ON ROADS...AND MINOR FLOODING OF POOR DRAINAGE AREAS. 63/BM
The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
A very small but intense thunderstorm complex which was nearly stationary produced heavy rains near Falcon Dam along the Starr Zapata county line during the evening of September 9th. The Falcon Dam CO-OP observer reported a 24 hour rainfall of 7.70 inches.
Locally heavy rains fell across portions of Deep South Texas during the day September 10th. An upper level disturbance which moved through the County Warning Area during the day triggering showers and thunderstorms which produced locally heavy rains through the day. One observer reported 3.92 inches of rainfall during the afternoon in Cameron County two miles west of Brownsville which caused a lot of street flooding in the area. Several other observers in Cameron County reported rainfall ranging from 2.22 inches northeast of Los Fresnos to 2.78 inches three miles north of Brownsville.
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: 196860, 196861.