An upper level low/TUTT moved across PR resulting in moisture and instability producing periods of intense rainfall and frequent lightning across most part of the island.
Every event with a place to put it. Tap one for its entry below.
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 SJU wrote it up.
An upper level low/TUTT moved across PR resulting in moisture and instability producing periods of intense rainfall and frequent lightning across most part of the island.
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 25, 10:36 AM AST, 18 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE SAN JUAN PR 1036 AM AST THU SEP 25 2014 .SYNOPSIS...UPPER LEVEL LOW/TUTT NORTHEAST OF THE AREA WILL AMPLIFY SOUTHWESTWARD NEXT NEXT 24 HRS THEN GRADUALLY WEAKEN EARLY NEXT WEEK. && .DISCUSSION...AS TUTT AMPLIFIES...EXPECT INFLOW OF CYCLONIC VORTICITY TO TRIGGER NMRS SHOWERS AND THUNDERSTORMS FRI AND SAT. WINDS HAVE SHIFTED TO THE NORTHEAST TODAY BUT ARE EXPECTED TO VEER QUICKLY TO THE EAST AND SOUTHEAST FRI AND SAT WHILE ALSO WEAKENING. ATMOSPHERE IS EXPECTED TO BECOME VERY UNSTABLE AND IN COMBINATION WITH THE WEAKENING STEERING FLOW AND STRONG FORCING MAY RESULT IN WIDESPREAD CONVECTION CAPABLE OF PRODUCING INTENSE RAINFALL IN A SHORT PERIOD OF TIME WHICH MAY RESULT IN FLASH FLOODING FRI AND SAT. A FLASH FLOOD WATCH IS BEING CONSIDERED. DRYING IS NOW EXPECTED ON SUNDAY AS TUTT PATTERN WEAKENS RAPIDLY AND DRYER AIR ADVECTS IN FROM THE SOUTH. && .AVIATION...T-STORMS LIKELY AT JMZ AND JPS LATER THIS AFTERNOON. MVFR/IFR CONDITIONS LIKELY FOR A FEW HOURS. && .MARINE...WINDS 10-15 KT AND SEAS 2-4 FT. SCT SHOWERS AND T-STORMS BECOMING MORE NMRS FRI AND SAT WITH HEAVY RAINFALL AND FREQ LIGHTNING. WINDS AND WAVES HIGHER NEAR THUNDERSTORMS. && .PRELIMINARY POINT TEMPS/POPS... SJU 86 78 87 77 / 60 40 70 40 STT 87 78 88 78 / 50 40 60 60 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 64/64
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 609 AM AST THU SEP 25 2014 AMZ710>745-PRZ001>013-261015- 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- 609 AM AST THU SEP 25 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE EXPECTED MAINLY OVER WESTERN PUERTO RICO. LOCALLY HEAVY RAINFALL...LIGHTNING AND STRONG GUSTY WINDS ARE POSSIBLE WITH THE HEAVIER STORMS. LOCALIZED URBAN FLOODING IS POSSIBLE WITH THIS ACTIVITY. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY AN UPPER LEVEL LOW NORTHEAST OF THE AREA IS EXPECTED TO GRADUALLY STRETCH TO THE WEST SOUTHWEST ACROSS THE LOCAL AREA. AS THE TROUGH AMPLIFIES...SHOWERS AND STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE WEEKEND OVER THE LOCAL AREA. THESE SHOWERS AND THUNDERSTORMS CAN PRODUCE PERIODS OF HEAVY RAINFALL...DAMAGING WIND GUSTS...FREQUENT LIGHTNING AND SMALL HAIL. URBAN AND SMALL STREAM FLOODING WILL BE POSSIBLE WITH THE HEAVIEST SHOWERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-261015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 609 AM AST THU SEP 25 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY AN UPPER LEVEL LOW NORTHEAST OF THE AREA IS EXPECTED TO GRADUALLY STRETCH TO THE WEST SOUTHWEST ACROSS THE LOCAL AREA. AS THE TROUGH AMPLIFIES...SHOWERS AND STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE WEEKEND. THESE SHOWERS AND THUNDERSTORMS CAN PRODUCE PERIODS OF HEAVY RAINFALL...STRONG WIND GUSTS AND FREQUENT LIGHTNING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Route PR-31 was not passable due to Rio Blanco out of its banks.
Los Sosa sector was reported flooded with a small creek out of its banks.
Road PR-132 was reported flooded.
A small creek flooded road PR-327 at El Salao sector.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2014Every state in 2014This day in weather historyWarnings in Puerto Rico, September 2014
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: 544116, 544121, 544122, 544124.