An upper level trough located west northwest of Puerto Rico combined with low level moisture left behind a tropical wave over the Central Caribbean to produce numerous showers showers and a few thunderstorms across the west and southwest section of Puerto Rico. By mid afternoon localized flash flood reports were received from San German and Cabo Rojo.
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The episode as NWS SJU wrote it up.
An upper level trough located west northwest of Puerto Rico combined with low level moisture left behind a tropical wave over the Central Caribbean to produce numerous showers showers and a few thunderstorms across the west and southwest section of Puerto Rico. By mid afternoon localized flash flood reports were received from San German and Cabo Rojo.
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 San Juan, PR wrote its last area forecast discussion before the first event at Jul 17, 3:56 PM AST, 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 356 PM AST TUE JUL 17 2007 .SHORT TERM...DOPPLER RADAR INDICATED NUMEROUS SHOWERS AND ISOLATED TO SCATTERED THUNDERSTORMS OVER THE NORTHERN COASTAL WATERS THIS AFTERNOON. THE ABUNDANT LOW LEVEL MOISTURE BEHIND THE TROPICAL WAVE...NOW OVER THE CENTRAL CARIBBEAN...IN COMBINATION WITH AN UPPER LEVEL TROUGH WEST NORTHWEST OF THE LOCAL AREA...DAYTIME HEATING AND LOCAL TERRAIN EFFECTS...PRODUCED NUMEROUS SHOWERS AND ISOLATED TO SCATTERED THUNDERSTORMS OVER THE NORTHERN HALF OF PUERTO RICO LATE IN THE MORNING AND EARLY IN THE AFTERNOON. THE SHOWERS AND THUNDERSTORMS MOVED LATE IN THE AFTERNOON ALSO OVER THE SOUTHERN SECTIONS OF PUERTO RICO. SEVERAL URBAN AND SMALL STREAM FLOOD ADVISORIES AND A FLASH FLOOD WARNING WERE ISSUED FOR DIFFERENT MUNICIPALITIES OF PUERTO RICO. THIS ACTIVITY WILL PREVAIL OVER THE FA UNTIL THE EARLY EVENING HOURS. .LONG TERM...THE WEAK TROPICAL WAVE...OVER THE CENTRAL CARIBBEAN THIS AFTERNOON...WILL CONTINUE TO MOVE TO THE WEST...WELL AWAY FROM THE FA. AN UPPER LEVEL TROUGH EXTENDS FROM A WEAK LOW PRESSURE AREA NEAR JAMAICA...ACROSS EASTERN CUBA...AND THEN EAST NORTHEAST TO ANOTHER LOW PRESSURE SYSTEM WELL NORTH OF PUERTO RICO...NEAR 30 NORTH...64 WEST...THIS AFTERNOON. THIS UPPER TROUGH WILL MOVE AWAY FROM THE LOCAL ISLANDS DURING THE NEXT FEW DAYS...WHILE AN ANTICYCLONIC CIRCULATION DEVELOP IN THE UPPER LEVEL OVER THE EASTERN CARIBBEAN. IN THE MEANTIME...THE UPPER LEVEL TROUGH WILL CONTINUE TO PROMOTE CLOUDINESS...SHOWERS AND THUNDERSTORMS MAINLY OVER THE NORTHERN COASTAL WATERS AT LEAST UNTIL LATE TONIGHT. AT THE LOW LEVELS...HIGH PRESSURE ACROSS THE WESTERN CENTRAL ATLANTIC WILL PROMOTE A MODERATE TO FRESH EASTERLY TRADE WIND FLOW OVER THE REGION DURING THE NEXT SEVERAL DAYS. LATEST SATELLITE AND AOT ANALYSIS INDICATED DRYER AND HAZY AIRMASS APPROACHING TO THE REGION FROM THE EAST. HOWEVER...THIS DRY WEATHER REGIME WILL BE SHORT LIVED... BECAUSE THE NEXT TROPICAL WAVE IS EXPECTED TO APPROACH TO THE LOCAL ISLANDS LATE TOMORROW NIGHT OR THURSDAY. && .PRELIMINARY POINT TEMPS/POPS... SJU 78 90 78 91 / 50 20 40 40 STT 79 87 79 87 / 40 40 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 12/72
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 600 AM AST TUE JUL 17 2007 PRZ001>013-AMZ710>750-181000- 600 AM AST TUE JUL 17 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...SHOWERS ALONG THE NORTHERN COAST OF PUERTO RICO ARE EXPECTED TO DIMINISH LATER THIS MORNING...AND LOCAL EFFECTS COMBINED WITH PATCHY LOW LEVEL MOISTURE...ARE EXPECTED TO RESULT IN THE DEVELOPMENT OF SCATTERED DIURNAL SHOWER ACTIVITY OVER THE INTERIOR AND WESTERN SECTIONS OF PUERTO RICO THIS AFTERNOON. THIS SHOWER ACTIVITY MAY RESULT IN VERY LOCALIZED SMALL STREAM AND URBAN FLOODING. IN ADDITION...SMALL CRAFTS ARE URGED TO EXERCISE CAUTION ACROSS THE LOCAL WATERS TODAY...DUE TO WINDS UP TO 18 KNOTS AND SEAS UP TO 6 FEET. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED OVER PARTS OF THE LOCAL ISLANDS AGAIN TOMORROW...AHEAD OF THE NEXT TROPICAL WAVE EXPECTED TO REACH THE LOCAL AREA ON THURSDAY. THIS WAVE WILL BRING AN INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY TO THE REGION. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TODAY. VIZ001-002-AMZ710>730-181000- 600 AM AST TUE JUL 17 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...SMALL CRAFTS ARE URGED TO EXERCISE CAUTION ACROSS THE LOCAL WATERS TODAY...DUE TO WINDS UP TO 18 KNOTS AND SEAS UP TO 6 FEET. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...ISOLATED PASSING SHOWERS ARE POSSIBLE ACROSS THE LOCAL ISLANDS ON WEDNESDAY...AHEAD OF THE NEXT TROPICAL WAVE...EXPECTED TO REACH THE LOCAL AREA ON THURSDAY. THIS WAVE WILL BRING AN INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY TO THE REGION. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE WEB SITE FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS AT (ALL LOWERCASE LETTERS): HTTP://WWW.SRH.NOAA.GOV/SJU FROM YOUR PDA/PHONE: HTTP://MOBILE.SRH.NOAA.GOV OR WWW.SRH.NOAA.GOV/WML SR
The San Juan radar (TJUA), 101 km away, was scanning. The volume nearest the first event began at 20:09 UTC.
1 flash flood. Local standard time, as filed.
At 410 pm local a spotter from the Hormigueros municipality reported flooding along Highways 114 and 103 from San German to Cabo Rojo. River Guanajibo was reported out of its banks.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2007Every state in 2007This day in weather historyWarnings in Puerto Rico, July 2007
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: 39511.