Showers and thunderstorms developed across the west interior and northwest Puerto Rico due to a mid-upper trough affected the local region.
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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 SJU wrote it up.
Showers and thunderstorms developed across the west interior and northwest Puerto Rico due to a mid-upper trough affected the local region.
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 Dec 13, 3:01 PM AST, 6 hours 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 301 PM AST SUN DEC 13 2015 .SYNOPSIS...MID/UPPER LEVEL TROUGH CENTERED OVER EASTERN CUBA WILL MEANDER OVER THE WINDWARD PASSAGE OVER THE NEXT FEW DAYS BEFORE SLOWLY MOVE EASTWARD INTO THE CENTRAL AND NORTHEAST CARIBBEAN LATE WEDNESDAY INTO THURSDAY. AS IT APPROACHES FROM THE WEST...THE CAP INVERSION WILL ERODE EARLY NEXT WEEK...FAVORING THE MOISTURE TRANSPORT ACROSS THE LOCAL ISLANDS MOST OF THE WEEK. ALTHOUGH WETTER TRADES ARE EXPECTED...NO WIDESPREAD SHOWER ACTIVITY IS ANTICIPATED. && .DISCUSSION...MOISTURE HAVE INCREASED ACROSS THE AREA SINCE THIS MORNING. TJSJ SOUNDING INDICATED 1.29 INCHES OF PRECIPITABLE WATER WHILE VALUES HAVE INCREASED TO 1.65 THIS AFTERNOON. AS A RESULT... SCATTERED SHOWERS HAVE BEEN DEVELOPED ACROSS MOST OF THE FORECAST AREA TODAY. SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE WEST INTERIOR AND NORTHWEST PUERTO RICO THIS AFTERNOON. ISOLATED DEEP CONVECTION IS POSSIBLE OVER NORTHWEST PR LATER THIS AFTERNOON. MOST OF THE AFTERNOON SHOWER ACTIVITY WILL TAPER OFF BEFORE SUNSET. CONDITIONS WILL BECOME MORE CONDUCIVE FOR SHOWER AND THUNDERSTORM ACTIVITY THROUGH MIDWEEK AS A MID-UPPER TROUGH/LOW APPROACHES THE REGION FROM THE WEST. INSTABILITY WILL REMAIN HIGH MOST OF THE WEEK AS UPPER TROUGH MOVES OVER THE AREA ON THURSDAY ENHANCING THE MOISTURE CONVERGENCE ACROSS THE LOCAL AREA. HOWEVER...NO WIDESPREAD SHOWER ACTIVITY IS EXPECTED FOR THE NEXT 5-7 DAYS. && .AVIATION...BRIEF MVFR CONDS POSSIBLE ACROSS TJMZ BTW 18-21Z. VFR CONDS EXPECTED ELSEWHERE. LLVL WINDS WILL PREVAIL FM THE ESE AROUND 15-25 KT. && .MARINE...SEAS IN THE ATLANTIC WILL INCREASE THROUGH MONDAY WITH AS A MODERATE NORTHERLY SWELL WILL CONTINUE TO REACH THE LOCAL ATLANTIC WATERS. SEAS ARE EXPECTED TO REMAIN AROUND 6 FEET OVER THE NEXT FEW DAYS. && .PRELIMINARY POINT TEMPS/POPS... SJU 74 86 75 86 / 30 20 10 30 STT 75 85 75 84 / 30 30 30 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. AM...NONE. && 10/11
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 532 AM AST SUN DEC 13 2015 AMZ710>745-PRZ001>013-140945- 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- 532 AM AST SUN DEC 13 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A MODERATE RISK OF RIP CURRENTS EXISTS AT SOME BEACHES ON THE NORTHERN COAST OF PUERTO RICO. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE MODERATE RISK OF RIP CURRENTS WILL SPREAD TO OTHER BEACHES ALONG THE NORTH COASTS OF PUERTO RICO MONDAY AND TUESDAY. NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... REPORTS OF RIP CURRENTS WOULD BE APPRECIATED. AMZ715-725-VIZ001-002-140945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 532 AM AST SUN DEC 13 2015 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 AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 111 km away, was scanning. The volume nearest the first event began at 01:29 UTC.
1 flash flood. Local standard time, as filed.
Rio Culebrinas was reported out of its banks at road PR-404. Also, Coloso valley was flooded.
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, December 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: 609898.