A weak upper level disturbance produced showers and isolated thunderstorms across portions of Deep South Texas. Locally heavy rains fell across portions of Cameron County during the afternoon.
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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.
A weak upper level disturbance produced showers and isolated thunderstorms across portions of Deep South Texas. Locally heavy rains fell across portions of Cameron County during the afternoon.
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 10, 7:54 PM CST, 4 hours 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BROWNSVILLE TX 854 PM CDT THU SEP 10 2009 .UPDATE...CONVECTION HAS TEMPORARILY WANED THIS EVENING AS ONE OF SEVERAL WAVES OF ENERGY MOVES NORTHEAST OF THE REGION. PLENTY OF ENERGY AND MOISTURE ACROSS ALL OF DEEP SOUTH TEXAS TO PROVIDE ADDITIONAL DEVELOP ANY LOCATION OVERNIGHT AND AGAIN ON FRIDAY. ATMOSPHERE REMAINS SATURATED WITH PWATS HOVERING AT 2.5 INCHES IN BRO...2.1 INCHES AT CRP AND EVEN 1.9 INCHES AT DEL RIO. CYCLOGENESIS IS UNDERWAY ACROSS NORTHEAST MEXICO WITH A POTENT UPPER TROUGH CENTERED ACROSS SOUTH CENTRAL TEXAS. THE JET STRUCTURE SHOWS A 40 TO 60 KNOT 250MB JET TRAVERSING THE SOUTH SIDE OF THE TROUGH WITH A WEAK 20 KNOT LOW LEVEL JET DEVELOPING JUST EAST OF THE TEXAS AND MEXICAN COAST. THE COMBINATION OF ALL THESE FEATURES SHOULD ENHANCE THE LIFT WITH REGENERATION OF SHOWERS AND THUNDERSTORMS ANTICIPATED LATER TONIGHT AND THROUGH MUCH OF THE DAY FRIDAY. RAIN CHANCES REMAIN NEAR 100 PERCENT FOR MOST AREAS OF DEEP SOUTH TEXAS WITH THE FLASH FLOOD WATCH TO REMAIN IN PLACE UNTIL THE THREAT OF HEAVY RAIN ENDS SOMETIME LATE FRIDAY. CURRENT GRID/FORECAST PACKAGE LOOKS GOOD WITH NO CHANGES MADE AT THIS TIME. && .MARINE...AT 7 PM BUOY 020 REPORTED SOUTH SOUTHEAST WINDS AT 16 KNOTS WITH GUSTS TO 19 KNOTS AND SEAS AT 4 FEET WITH A 5 SECOND PERIOD. A LOW PRESSURE TROUGH OVER THE WESTERN GULF OF MEXICO IS PRODUCING SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE MARINE AREAS. THE TROUGH COMBINED WITH AN UPPER LEVEL LOW PRESSURE SYSTEM LOCATED ACROSS CENTRAL TEXAS AND A FRONTAL BOUNDARY WHICH WILL MOVE INTO SOUTH TEXAS THIS WEEKEND WILL MAINTAIN A CHANCE FOR SHOWERS AND ISOLATED THUNDERSTORMS MOVING ACROSS PORTIONS OF THE MARINE AREAS AT TIMES THROUGH EARLY NEXT WEEK. THE WINDS WILL CONTINUE LIGHT TO MODERATE FROM THE SOUTHEAST AND THE SEAS WILL CONTINUE LOW THROUGH EARLY NEXT WEEK. WINDS AND SEAS WILL INCREASE IN OR NEAR ANY SHOWERS OR THUNDERSTORMS. && .AVIATION...MVFR TO IFR CONDITIONS WITH LIGHT EASTERLY WINDS AND MOSTLY CLOUDY SKIES ARE BEING REPORTED AT THE REGIONAL AIRPORTS. SHOWERS CONTINUE ACROSS PORTIONS OF THE CWA THIS EVENING. THERE IS A CHANCE FOR SHOWERS AND ISOLATED THUNDERSTORMS MOVING ACROSS PORTIONS OF THE CWA AT TIMES FOR THE NEXT FEW DAYS. CEILINGS AND/OR VISIBILITIES MAY DECREASE TO MVFR OR TEMPORARY IFR CONDITIONS IN ANY SHOWERS OR THUNDERSTORMS. VFR TO IFR CONDITIONS WILL PREVAIL ACROSS THE REGIONAL AIRPORTS DURING THE NEXT 24 HOURS. && .PREV DISCUSSION...ISSUED 124 PM CDT THU SEP 10 2009... UPPER LOW CURRENTLY IN THE VICINITY OF DEL RIO WHILE AT THE SFC LOW PRESSURE SEEMS TO BE STARTING TO WRAP UP NEAR LRD. SFC WINDS REMAIN LIGHT ONSHORE AT THE SFC ALONG THE COAST WITH WESTERLY FLOW ALOFT. THIS WILL CONTINUE TO KEEP DEEP ATMOSPHERIC MOISTURE IN THE REGION INTO EARLY NEXT WEEK. RAIN CHANCES REMAIN GREATER THAN 80 PERCENT THROUGH TOMORROW AS THE UPPER LOW DRIFTS SLOWLY EAST AND A WEAK FRONT MOVES INTO SOUTH CENTRAL TEXAS...FURTHER FOCUSING THE MOISTURE ACROSS DEEP SOUTH TEXAS. WITH ATMOSPHERE REMAINING VERY MOIST AND UNSTABLE...HEAVY RAINFALL WILL CONTINUE TO BE A THREAT THROUGH THE NEXT 36 TO 48 HOURS. FLASH FLOOD WATCHES WILL CONTINUE THROUGH FRIDAY NIGHT...AND MAY NEED TO BE PUSHED OUT FURTHER TO SATURDAY WITH CONTINUED WET WEATHER. SEVERE WEATHER NOT EXPECTED AS FREEZING LEVEL AND WETBULB ZERO ARE NEAR 16KFT AND NO COOLING OR DRYING EXPECTED ALOFT. TEMPERATURES WILL REMAIN NEAR NORMAL IN THE LOW 90S...WITH HIGHEST TEMPS WHERE TEMPORARY BREAKS LET SOME SUNSHINE THROUGH. LONGER RANGE FORECAST STILL SOMEWHAT UNCERTAIN AS MODELS ARE DISSIMILAR WITH RESPECT TO MIDLEVEL TROUGH PLACEMENT MIDDLE OF THE WEEK. WILL CONTINUE POP CHANCES THROUGH THE WEEK...MAINLY DUE TO LLVL MOISTURE REMAINING AND DAYTIME HEATING ACTIVATING THE SEABREEZE. IF THE TROUGH REMAINS ACROSS THE STATE AS IT IS NOW...HIGHER POPS AND HEAVY RAIN WILL CONTINUE. AVIATION... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE TODAY AND TOMORROW. EXPECT MAINLY SHOWERS WITH HEAVY RAIN TODAY. THUNDERSTORMS WILL BE EMBEDDED BUT FEWER IN NUMBER. ABUNDANT TROPICAL MOISTURE IS MOVING ASHORE FROM THE GULF IN WAVES OR PULSES. THESE WILL BE PHASED FOR THE NEXT 48 HOURS. COASTAL AREAS INCLUDING THE BROWNSVILLE/SOUTH PADRE INTERNATIONAL AIRPORT WILL BE MOST DIRECTLY AFFECTED...BUT THE SHOWERS HAVE BEEN MOVING INTO THE MID AND UPPER VALLEY AS WELL. MARINE... BUOY020 REPORTS MODERATE NORTH NORTHEAST WINDS AND SEAS OF 3 FEET WITH 4 TO 5 SECONDS OF PERIOD. WINDS ARE MODERATE FROM THE EAST OVER THE LAGUNA. UNSETTLED WEATHER WILL CONTINUE INTO THE WEEKEND AS COASTAL TROUGHING REMAINS A SALIENT FEATURE OFFSHORE. SHOWER ACTIVITY HAS NOW ALSO SPREAD NORTH INTO THE NORTHERN MARINE ZONES. WINDS WILL BE LIGHT TO MODERATE OFFSHORE FOR THE NEXT COUPLE OF DAYS...BUT MAY VEER TO SOUTH OVER THE WEEKEND AS A COLD FRONT APPROACHES THE TEXAS COAST FROM THE NORTH. IF THE FRONT GETS CLOSE ENOUGH...WINDS MAY SHIFT TO NORTHEAST. THE FRONT IS CURRENTLY EXPECTED TO STALL NORTH OF THE LOWER TEXAS COAST. IN ANY CASE...SEAS ARE EXPECTED TO REMAIN LOW TO MODERATE THROUGH THE FORECAST AND NO ADVISORIES ARE EXPECTED. && .PRELIMINARY POINT TEMPS/POPS... BAYVIEW/PORT ISABEL 77 87 76 90 / 80 90 60 60 BROWNSVILLE 76 88 76 92 / 80 90 60 60 HARLINGEN 75 90 75 92 / 80 90 60 60 MCALLEN 76 90 76 94 / 80 80 60 60 RIO GRANDE CITY 74 89 75 96 / 50 80 50 50 SOUTH PADRE ISLAND 77 87 77 86 / 80 90 60 60 && .BRO WATCHES/WARNINGS/ADVISORIES... TX...FLASH FLOOD WATCH THROUGH FRIDAY EVENING FOR TXZ250-251-253>257. 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 954 AM CDT THU SEP 10 2009 TXZ248>257-111500- ZAPATA-JIM HOGG-BROOKS-KENEDY-STARR-HIDALGO-INLAND WILLACY- INLAND CAMERON-COASTAL WILLACY-COASTAL CAMERON- 954 AM CDT THU SEP 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR DEEP SOUTH TEXAS. .DAY ONE...TODAY AND TONIGHT. A FLASH FLOOD WATCH IS IN EFFECT FOR CAMERON...WILLACY... KENEDY...HIDALGO AND BROOKS COUNTIES. SLOW MOVING SHOWERS AND THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL AND FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT FRIDAY FOR CAMERON...WILLACY... KENEDY...HIDALGO AND BROOKS COUNTIES. SLOW MOVING SHOWERS AND THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL AND FLOODING. UNSETTLED WEATHER WILL CONTINUE THROUGH THE WEEKEND WITH PERIODS OF LOCALLY HEAVY RAIN POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. GMZ130-132-135-150-155-170-175-111500- 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- 954 AM CDT THU SEP 10 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 OCCASIONAL CLOUD TO WATER LIGHTNING...GUSTY WINDS AND HIGHER SEAS ON OPEN WATERS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. MARINE SHOWERS AND THUNDERSTORMS WILL PRODUCE OCCASIONAL CLOUD TO WATER LIGHTNING...GUSTY WINDS AND HIGHER SEAS ON OPEN WATERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
The ASOS at Brownsville reported 2.72 inches of rain fell during a thunderstorm which moved through Brownsville around midnight, triggered by a weak upper level disturbance which produced locally heavy rainfall across portions of Deep South Texas during the day of September 10th.
A CO-OP observer reported 2.41 inches of rain fell during a thunderstorm which moved through the Sarita area during the early afternoon Sunday September 11th.
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: 196862, 196865.