Light northerly winds converging with the land breeze along the northern coast of Puerto Rico, brought an area of moderate to locally heavy rainfall across much of the north coastal municipalities.
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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.
Light northerly winds converging with the land breeze along the northern coast of Puerto Rico, brought an area of moderate to locally heavy rainfall across much of the north coastal municipalities.
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 14, 10:19 PM AST, 1 hour 33 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
1019 PM AST TUE DEC 14 2010
.UPDATE...LIGHT NORTHERLY WINDS CONVERGING WITH THE LAND BREEZE
ALONG THE NORTHERN COAST OF PUERTO RICO BROUGHT AREAS OF HEAVY
RAINFALL THIS EVENING. EXPECT CONTINUED SHOWER DEVELOPMENT ALONG
THE NORTHERN COAST OF PUERTO RICO AND THE WATERS JUST TO THE NORTH
OF PUERTO RICO THROUGH THE EARLY MORNING HOURS...AND WENT AHEAD AN
UPPED POPS ACROSS THIS AREA EARLY IN THE EVENING AS A RESULT.
LATEST GFS INDICATION BEST LOW LEVEL MOISTURE AND DYNAMICS
ASSOCIATED WITH THE FRONTAL BOUNDARY TO OUR NORTHWEST WILL BE
ACROSS PUERTO RICO TOMORROW AFTERNOON THROUGH EARLY THURSDAY
MORNING...SO INHERITED LIKELY CHANCES FOR RAIN OVER THIS TIME
PERIOD CONTINUE TO LOOK GOOD. OTHER THAN THE AFOREMENTIONED CHANGES
TO THE SHORT TERM FORECAST...NO ADDITIONAL MODIFICATIONS NECESSARY
THIS EVENING.
&&
.AVIATION...COLD FRONT/SHEAR LINE WILL ENTER FORECAST AREA BEFORE
15/12Z AND SPREAD SHWRS AND RAIN OVER PUERTO RICO...MAINLY ON THE
NORTH COAST WHERE TAF SITES TJSJ...TJBQ AND POSSIBLY TJMZ WILL SEE
NUMEROUS VCSHS AND SHRAS. AS A RESULT...MVFR CONDS WILL BE
INTERMITTENT AT THESE SITES WITH VFR CONDS EXPECTED ELSEWHERE. MTN
OBSCURATIONS WILL CONTINUE IN PR AND OCNLY THE USVI THROUGH
16/00Z. LLVL FLOW WILL BE NORTHERLY 5-10 KT OR LESS WITH GUSTY
WINDS 20 KT NEAR SOME SHWRS.
&&
.MARINE...RAPIDLY INCREASING SEAS WILL LEAD TO ROUGH AND HAZARDOUS
MARINE CONDITONS ACROSS THE LOCAL ATLANTIC WATERS AND MONA PASSAGE
OVERNIGHT. THESE SWELLS WILL MAKE IT INTO THE ANEGADA PASSAGE AND
CARIBBEAN WATERS EARLY WEDNESDAY MORNING...RESULTING IN LARGE
AREAS OF ROUGH...CONFUSED...AND HAZARDOUS SEAS. IN ADDITION...DUE
TO THESE LARGE SWELLS...A HIGH SURF ADVISORY IS IN EFFECT FOR THE
NORTHERN EXPOSED COASTLINES OF PUERTO RICO...CULEBRA...AND THE
NORTHERN USVI BEGINNING AT MIDNIGHT AST TONIGHT.
&&
.PREV DISCUSSION... /ISSUED 248 PM AST TUE DEC 14 2010/
SYNOPSIS...MID TO UPPER LEVEL TROUGHINESS WILL CONTINUE ACROSS THE
WEST AND SOUTHWEST ATLANTIC THROUGH LATE WEDNESDAY OR WEDNESDAY
NIGHT...BEFORE SLOWLY LIFTING OUT TO THE EAST NORTHEAST THURSDAY
THROUGH FRIDAY...AS MID TO UPPER LEVEL RIDGE BUILDS ACROSS THE
CARIBBEAN. A COLD FRONT IS EXPECTED TO MOVE SLOWLY SOUTHEAST
ACROSS THE LOCAL AREA LATE TONIGHT AND WEDNESDAY THROUGH THURSDAY.
DISCUSSION...A COLD FRONT IS EXPECTED TO REACH THE LOCAL
ATLANTIC WATERS LATE TONIGHT...AND THEN MOVE SLOWLY SOUTHEAST
ACROSS THE LOCAL AREA WEDNESDAY THROUGH THURSDAY. PER NCEP
COORDINATION AND MODEL PROJECTIONS...EXPECT THIS BOUNDARY TO BE A
SLOW MOVER AND SHOULD BE ENOUGH MOISTURE AND MID TO UPPER LEVEL
JET DYNAMICS AVAILABLE...TO RESULT IN A PERIOD OF ACTIVE
WEATHER...PROBABLY LATE TONIGHT THROUGH MOST OF WEDNESDAY...WITH
THE NORTH AND INTERIOR SECTIONS OF PUERTO RICO MOST AT RISK FOR AT
LEAST SOME LOCALLY HEAVY RAINFALL AND THE POTENTIAL FOR AT LEAST
SOME MINOR FLOODING. HAVE MADE SOME CHANGES TO SHORT TERM GRIDS
TO TRY TO SHOW THIS THINKING. REMNANTS OF BOUNDARY WILL LINGER
ACROSS THE LOCAL ISLANDS THROUGH THURSDAY AND POSSIBLY THURSDAY
NIGHT...BEFORE IT IS FAR ENOUGH SOUTH OF THE LOCAL ISLANDS AND
WEAK ENOUGH THAT IT SHOULD NOT HAVE A BIG EFFECT ON THE LOCAL
SENSIBLE WEATHER. AT THIS TIME...GENERALLY FAIR AND DRIER
CONDITIONS ARE INDICATED FOR FRIDAY AND SATURDAY.
AVIATION...EXPECT PREVAILING VFR CONDS AT ALL TAF SITES THROUGH
MOST OF TONIGHT...EXPECT BRIEF MVFR CONDS ARE POSSIBLE IN SHOWERS
OVER TJBQ. LATE TONIGHT...EXPECT MORE NUMEROUS MVFR CONDITIONS TO
GRADUALLY SPREAD ACROSS THE LOCAL ISLANDS AND TAF SITES FROM THE
WEST AND NORTHWEST.
MARINE...LARGE...LONG PERIOD NORTHWEST SWELLS WILL BUILD ACROSS THE
LOCAL ATLANTIC WATERS AND THE CARIBBEAN PASSAGES TONIGHT THROUGH
WEDNESDAY...PEAKING EARLY WEDNESDAY AND THEN CONTINUING THROUGH AT
LEAST THURSDAY. THESE SWELLS WILL RESULT IN ROUGH AND HAZARDOUS
MARINE CONDITIONS ACROSS MANY PARTS OF THE REGIONAL WATERS. A
SMALL CRAFT ADVISORY WILL GO INTO EFFECT FOR THE ATLANTIC OFF
SHORE WATERS AND THE MONA PASSAGE AT 6 PM AST THIS EVENING...WITH
CONDITIONS SPREADING TO MANY OTHER SECTIONS THROUGH TONIGHT AND
EARLY WEDNESDAY.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 73 81 73 80 / 60 70 50 50
STT 71 83 72 83 / 20 20 20 40
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...HIGH SURF ADVISORY FROM MIDNIGHT TONIGHT TO 10 AM AST THURSDAY
FOR CULEBRA-MAYAGUEZ AND VICINITY-NORTH CENTRAL-NORTHEAST-
NORTHWEST-SAN JUAN AND VICINITY.
SCA AMZ710-712-715-732-735-741-742-745.
VI...HIGH SURF ADVISORY FROM MIDNIGHT TONIGHT TO 10 AM AST THURSDAY
FOR ST. THOMAS/ST. JOHN/ADJACENT ISLANDS.
SCA AMZ710-712-715-732-735.
&&
12/04HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 534 AM AST TUE DEC 14 2010 AMZ710>745-PRZ001>013-150945- 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- 534 AM AST TUE DEC 14 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED TODAY...HOWEVER INCREASING SEAS WILL LEAD TO ROUGH SURF ZONE CONDITIONS ALONG THE NORTHWEST AND NORTH FACING COASTLINES BEGINNING TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST SWELLS WILL CREATE HAZARDOUS SURF CONDITIONS ALONG THE NORTH FACING COASTLINES...WITH A MODERATE TO HIGH RISK OF RIP CURRENTS THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED AT THIS TIME. AMZ715-725-VIZ001-002-150945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 534 AM AST TUE DEC 14 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST SWELLS WILL CREATE HAZARDOUS SURF CONDITIONS ALONG THE COASTLINES OF THE NORTHERN VIRGIN ISLANDS...WITH A MODERATE TO HIGH RISK OF RIP CURRENTS THROUGH THURSDAY. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST SWELLS WILL CREATE HAZARDOUS SURF CONDITIONS ALONG THE NORTH FACING COASTLINES...WITH A MODERATE TO HIGH RISK OF RIP CURRENTS THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED AT THIS TIME.
The San Juan radar (TJUA), 58 km away, was scanning. The volume nearest the first event began at 03:51 UTC.
6 heavy rain, 1 flash flood. Local standard time, as filed.
Flooding was reported at Laguna los Rabanos sector in the municipality of Manati.
Highway 22, at exit 22 to San Juan was reported flooded in the municipality of Dorado.
Urban flooding was reported at Arenares road 19 in the municipality of Dorado.
Houses were reported flooded at Urb Estancias de la Fuente, Princess street, in the municipality of Toa Baja.
Urban flooding was reported at Urb Villa Olimpica in Rio Piedras sector in the municipality of San Juan.
Urban flooding was reported along Condado Avenue in the municipality of San Juan.
Urban flooding was reported at Miramar sector, in the municipality of San Juan.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2010Every state in 2010This day in weather historyWarnings in Puerto Rico, December 2010
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: 275309, 275310, 275311, 275242, 275085, 275250, 275312.