A tropical wave resulted in numerous showers and thunderstorms developed along Cordillera Central and across Western and interior sections of Puerto Rico. The wave was accompanied by a large area of moisture with showers and thunderstorms.
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The episode as NWS SJU wrote it up.
A tropical wave resulted in numerous showers and thunderstorms developed along Cordillera Central and across Western and interior sections of Puerto Rico. The wave was accompanied by a large area of moisture with showers and thunderstorms.
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 Sep 1, 11:11 AM AST, 1 hour 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1111 AM AST TUE SEP 1 2015 .UPDATE...CLOUDINESS WITH SHOWER ACTIVITY HAS BEEN INCREASING LATE THIS MORNING AS TROPICAL WAVE MOVES THROUGH THE AREA. ACTIVE WEATHER IS EXPECTED THIS AFTERNOON...AS WAVE COMBINED WITH DAYTIMEHEATING AND LOCAL EFFECTS. NO CHANGES NEEDED TO FORECAST GRIDS AS FORECAST IS ON TRACK WITH ONGOING WEATHER SITUATION. && .AVIATION...SCT SHRA/TSRA ARE EXPECTED TO AFFECT THE FLYING AREA THRU THE FCST PERIOD AS A TROPICAL WAVE MOVES OVER THE LOCAL ISLANDS. MAINLY VFR WITH TEMPO MVFR CONDITIONS SPREADING FM LEEWARD TERMINALS THRU USVI/EASTERN PR TERMINALS BY NOON AST...THEN OVER THE INTERIOR AND WESTERN PR WITH MTN TOPS OBSCD ALONG ALL MTN RANGES OF MAINLAND PR AFT 01/16Z. EASTERLIES BLO FL200 AT 10-20 KTS...HIGHER GUSTS NEAR TSRA. && .MARINE...NO CHANGES TO PREVIOUS DISCUSSION. && .PREV DISCUSSION... /ISSUED 446 AM AST TUE SEP 1 2015/ SYNOPSIS...AT UPPER LEVELS...WEAK LOW PRESSURE WILL DRIFT SOUTH OVER THE AREA THROUGH WEDNESDAY...AND THEN HOVER NEARBY THROUGH THE END OF THE WEEK. WEAK HIGH PRESSURE WILL BUILD IN EARLY NEXT WEEK. AT MID LEVELS...HIGH PRESSURE PERSISTS THROUGH MUCH OF NEXT WEEK. FIRST NORTH OF THE AREA AND THEN MAINLY OVER OR JUST EAST OF THE AREA. MID LEVELS MOISTEN CONSIDERABLY TONIGHT AND THEN DRY OUT SLOWLY ON FRIDAY. MID LEVELS ARE GENERALLY DRY THROUGH NEXT TUESDAY. AT LOWER LEVELS...A TROPICAL WAVE WILL MOVE THROUGH THE AREA THIS AFTERNOON SPREADING SHOWERS AND SCATTERED THUNDERSTORMS ACROSS THE AREA. ALTHOUGH A FEW PATCHES OF MOISTURE COME IN FROM THE NORTHEAST OVER THE WEEKEND NEITHER STRONG FEATURES NOR DEEP MOISTURE ARE EXPECTED UNTIL AFTER THE END OF THIS FORECAST PERIOD. DISCUSSION...LIGHT TO MODERATE SHOWERS FELL ACROSS SAINT THOMAS AND SAINT CROIX LEAVING SEVERAL HUNDREDTHS AND ONE TENTH INCH RESPECTIVELY. AND...SHOWERS HAVE ALREADY BEGUN TO MOVE IN ACROSS EASTERN PUERTO RICO...WITH HEAVIER SHOWERS MOVING INTO HUMACAO AND YABUCOA. SHOWERS WILL CONTINUE TO INCREASE SPORADICALLY ACROSS THE AREA THIS MORNING AND THEN FORM ACROSS WESTERN PUERTO RICO WITH SCATTERED THUNDERSTORMS. WOULD EXPECT SOME POSSIBILITY FOR GUSTY WINDS AND LOCAL URBAN AND SMALL STREAM FLOODING TODAY. MOISTURE CONTINUES ACROSS THE AREA TONIGHT...ALTHOUGH AMOUNTS WILL NOT BE VERY HEAVY ACROSS WESTERN PUERTO RICO...THEN...TOMORROW...SHOWERS WILL BEGIN TAPERING OFF IN THE U.S. VIRGIN ISLANDS AND EASTERN PUERTO RICO...BUT THE BACK OF THE WAVE WILL STILL PRODUCE SHOWERS AND SCATTERED THUNDERSTORMS IN NORTHWEST PUERTO RICO WEDNESDAY. ACCORDING TO THE GFS THIS IS THE BEST MOISTURE THAT WILL OCCUR FOR THE NEXT 10 DAYS. FLOW AT MID LEVELS BECOMES NORTHEAST AROUND HIGH PRESSURE JUST NORTH OF THE AREA AND WEAK BANDS OF MOISTURE DO MOVE ACROSS THE AREA THROUGH THE WEEKEND...BUT OTHERWISE SIGNIFICANT FEATURES ARE NOT SEEN UNTIL AFTER THE FRIDAY AFTER NEXT...WHEN A STRONG TROPICAL WAVE IS SEEN APPROACHING THE LEEWARD ISLANDS. IT WILL PROBABLY NOT ARRIVE UNTIL 13 SEPTEMBER AND HAS NOT YET COME OUT OF AFRICA. SOME AREAS OF SAHARAN DUST WERE SEEN IN THE AREAS OF DRIER AIR...BUT THE BULK OF THE DUST IS TO MOVE SOUTH OF PUERTO RICO AND THE U.S. VIRGIN ISLANDS. AVIATION...SCT SHRA/TSRA ARE EXPECTED TO AFFECT THE FLYING AREA THRU THE FCST PERIOD AS A TROPICAL WAVE MOVES OVER THE LOCAL ISLANDS. MAINLY VFR WITH TEMPO MVFR CONDITIONS SPREADING FM LEEWARD TERMINALS THRU USVI/EASTERN PR TERMINALS BY NOON AST...THEN OVER THE INTERIOR AND WESTERN PR WITH MTN TOPS OBSCD ALONG ALL MTN RANGES OF MAINLAND PR AFT 01/16Z. EASTERLIES BLO FL200 AT 10-20 KTS...HIGHER GUSTS NEAR TSRA. MARINE...WINDS AND SEAS ARE SLOWLY SUBSIDING AND ARE EXPECTED TO CONTINUE TO DO SO THROUGH THE NEXT 5 TO 7 DAYS. && .PRELIMINARY POINT TEMPS/POPS... SJU 90 79 91 78 / 60 50 40 20 STT 88 80 88 79 / 60 40 40 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. AM...NONE. && 71/72
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 533 AM AST TUE SEP 1 2015 AMZ710>745-PRZ001>013-020945- SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR- NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST- WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES- THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS- 533 AM AST TUE SEP 1 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT .THUNDERSTORMS...THERE IS A CHANCE OF THUNDERSTORMS WITH HEAVY RAINFALL AND BRIEF GUSTY WINDS THIS AFTERNOON ACROSS PORTIONS OF MAINLAND PUERTO RICO. .FLOODING...HEAVY RAINS COULD LEAD TO URBAN AND SMALL STREAM FLOODING. .RIP CURRENTS...THERE IS A MODERATE RISK OF RIP CURRENTS FOR THE FOLLOWING BEACHES IN PUERTO RICO: PINONES...OCEAN PARK...LA PARED...MAR CHIQUITA...PUERTO NUEVO...JOBOS...BALLENA AND FLAMENCO. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED A THIS TIME. HOWEVER...AFTERNOON THUNDERSTORMS ARE FORECAST ACROSS THE INTERIOR AND WESTERN PR FOR THE NEXT FEW DAYS. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTER ARE ENCOURAGED TO REPORT FLOODING AND RIP CURRENTS TO THE NATIONAL WEATHER SERVICE IN SAN JUAN. AMZ715-725-VIZ001-002-020945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 533 AM AST TUE SEP 1 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT .THUNDERSTORMS...THERE IS A CHANCE OF THUNDERSTORMS WITH HEAVY RAINFALL AND BRIEF GUSTY WINDS THIS AFTERNOON ACROSS PORTIONS OF ALL LOCAL ISLANDS AND OVER THE WATERS. .RIP CURRENTS...THERE IS A MODERATE RISK OF RIP CURRENTS FOR MAGENS BAY AND CRAMER PARK. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTER ARE ENCOURAGED TO REPORT RIP CURRENTS TO THE NATIONAL WEATHER SERVICE IN SAN JUAN.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Road PR-1 was reported flooded near El Pulguero in direction to San Juan.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2015Every state in 2015This day in weather historyWarnings in Puerto Rico, September 2015
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: 602883.