The combination of high moisture content and a subtropical jet maxima which was located north of Puerto Rico, favored the development of deep convection across the northeast and north central sections of Puerto Rico.
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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.
The combination of high moisture content and a subtropical jet maxima which was located north of Puerto Rico, favored the development of deep convection across the northeast and north central sections of Puerto Rico.
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 7, 2:58 PM AST, 6 hours 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 258 PM AST TUE DEC 7 2010 .SYNOPSIS...GENERALLY UNSETTLED WEATHER IS EXPECTED TO DEVELOP ACROSS PUERTO RICO AND THE U.S. VIRGIN ISLANDS TODAY...AND PERSIST THROUGH AT LEAST THE END OF THE WEEK. && .DISCUSSION...CLOUDY CONDITIONS PREVAILED TODAY ACROSS THE LOCAL FORECAST AREA...BUT AFTER 2 PM SHOWERS AND THUNDERSTORMS STARTED TO DEVELOP ALONG THE CORDILLERA CENTRAL AND EL YUNQUE. THESE SHOWERS GENERATED RAINFALL ACCUMULATIONS OF AROUND 1 INCH. MOST OF THE SHOWERS WILL DISSIPATE BEFORE SUNSET BUT UPPER LEVEL CONDITIONS ARE FAVORABLE FOR SOME OF THESE SHOWERS TO LAST THROUGH THE EVENING HOURS. DEEP TROPICAL MOISTURE CONTINUED TO MOVE THE LOCAL AREA INCREASING THE CLOUD AND SHOWERS COVERAGE. WE WILL BE UNDER THE INFLUENCE OF THIS MOISTURE AREA THROUGH THE INCOMING WEEKEND. ALSO...SHORT WAVE PERTURBATIONS WILL CONTINUE TO STREAM ACROSS THE THE LOCAL FORECAST AREA. THIS MIGHT BE ENOUGH TO TRIGGER DEEP CONVECTIVE CELLS ACROSS THE FORECAST AREA THROUGH AT LEAST FRIDAY && .AVIATION...PREVAILING VFR CONDITIONS ARE GENERALLY EXPECTED TO CONTINUE ACROSS THE LOCAL ISLANDS AND AT ALL TAF SITES REST OF TODAY AND THIS EVENING. HOWEVER...INCREASING MVFR/LOCAL IFR CONDITIONS AND MOUNTAIN OBSCURATIONS ARE EXPECTED TO DEVELOP ACROSS THE LOCAL ISLANDS IN SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS. && .MARINE...NORTHERLY SWELLS WILL MAINTAIN ROUGH AND HAZARDOUS SEA CONDITIONS ACROSS MUCH OF THE LOCAL ATLANTIC WATERS AND CARIBBEAN PASSAGES FOR THE NEXT SEVERAL DAYS. A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE LOCAL ATLANTIC WATERS OF PUERTO RICO. MARINERS SHOULD EXERCISE CAUTION FOR THE NEAR SHORE ATLANTIC AND LOCAL PASSAGES. && .PRELIMINARY POINT TEMPS/POPS... SJU 74 82 73 83 / 40 50 50 40 STT 74 84 76 85 / 50 30 30 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 13/10
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS...CORRECTED NATIONAL WEATHER SERVICE SAN JUAN PR 603 AM AST TUE DEC 7 2010 AMZ710>745-PRZ001>013-081015- 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- 603 AM AST TUE DEC 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT DEEP TROPICAL MOISTURE WILL CONTINUE TO SURGE NORTH TODAY AND TONIGHT. THIS MOISTURE WILL COMBINE WITH LOCAL EFFECTS AND FAVORABLE UPPER LEVEL WIND CONDITIONS...TO PRODUCE SCATTERED TO NUMEROUS SHOWERS AND A FEW THUNDERSTORMS ACROSS THE LOCAL ISLANDS. ALTHOUGH NO SIGNIFICANT FLOODING IS EXPECTED...SOME LOCALIZED HEAVY RAINFALL AND MINOR URBAN FLOODING ARE POSSIBLE. A COMBINATION OF LONG PERIOD...NORTHEAST AND NORTHWEST SWELLS WILL MAINTAIN ROUGH AND HAZARDOUS SEA CONDITIONS ACROSS THE LOCAL ATLANTIC WATERS AND THE CARIBBEAN PASSAGES THROUGH TONIGHT. WHILE BREAKING WAVE HEIGHTS ARE EXPECTED TO REMAIN JUST BELOW THE 10 FOOT HIGH SURF ADVISORY CRITERIA...DANGEROUS RIP CURRENTS ARE LIKELY ALONG THE NORTHERN EXPOSED COASTLINES OF THE LOCAL ISLANDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY DEEP TROPICAL MOISTURE WILL CONTINUE TO AFFECT THE LOCAL ISLANDS THROUGH AT LEAST WEDNESDAY. THIS MOISTURE WILL CONTINUE TO COMBINE WITH LOCAL EFFECTS AND FAVORABLE UPPER LEVEL WIND CONDITIONS...TO PRODUCE SCATTERED TO NUMEROUS SHOWERS AND A FEW THUNDERSTORMS ACROSS THE LOCAL ISLANDS. SOME ADDITIONAL LOCALIZED HEAVY RAINFALL AND MINOR URBAN FLOODING ARE POSSIBLE. A COMBINATION OF LONG PERIOD...NORTHEAST AND NORTHWEST SWELLS WILL MAINTAIN ROUGH AND HAZARDOUS SEA CONDITIONS ACROSS THE LOCAL ATLANTIC WATERS AND THE CARIBBEAN PASSAGES FOR WEDNESDAY AND THURSDAY. WHILE BREAKING WAVE HEIGHTS ARE EXPECTED TO REMAIN JUST BELOW THE 10 FOOT HIGH SURF ADVISORY CRITERIA...DANGEROUS RIP CURRENTS ARE LIKELY ALONG THE NORTHERN EXPOSED COASTLINES OF THE LOCAL ISLANDS. .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF HEAVY RAINFALL OR FLOODING WOULD BE GREATLY APPRECIATED. AMZ715-725-VIZ001-002-081015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 603 AM AST TUE DEC 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT DEEP TROPICAL MOISTURE WILL CONTINUE TO SURGE NORTH TODAY AND TONIGHT. THIS MOISTURE WILL COMBINE WITH LOCAL EFFECTS AND FAVORABLE UPPER LEVEL WIND CONDITIONS...TO PRODUCE SCATTERED SHOWERS AND A COUPLE OF THUNDERSTORMS ACROSS THE LOCAL ISLANDS. ALTHOUGH NO SIGNIFICANT FLOODING IS EXPECTED...SOME LOCALIZED HEAVY RAINFALL AND MINOR URBAN FLOODING ARE POSSIBLE. A COMBINATION OF LONG PERIOD...NORTHEAST AND NORTHWEST SWELLS WILL MAINTAIN ROUGH AND HAZARDOUS SEA CONDITIONS ACROSS THE LOCAL ATLANTIC WATERS AND THE CARIBBEAN PASSAGES THROUGH TONIGHT. WHILE BREAKING WAVE HEIGHTS ARE EXPECTED TO REMAIN JUST BELOW THE 10 FOOT HIGH SURF ADVISORY CRITERIA...DANGEROUS RIP CURRENTS ARE LIKELY ALONG THE NORTHERN EXPOSED COASTLINES OF THE LOCAL ISLANDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY DEEP TROPICAL MOISTURE WILL CONTINUE TO AFFECT THE LOCAL ISLANDS THROUGH AT LEAST WEDNESDAY. THIS MOISTURE WILL CONTINUE TO COMBINE WITH LOCAL EFFECTS AND FAVORABLE UPPER LEVEL WIND CONDITIONS...TO PRODUCE SCATTERED SHOWERS AND A COUPLE OF THUNDERSTORMS ACROSS THE LOCAL ISLANDS. SOME ADDITIONAL LOCALIZED HEAVY RAINFALL AND MINOR URBAN FLOODING ARE POSSIBLE. A COMBINATION OF LONG PERIOD...NORTHEAST AND NORTHWEST SWELLS WILL MAINTAIN ROUGH AND HAZARDOUS SEA CONDITIONS ACROSS THE LOCAL ATLANTIC WATERS AND THE CARIBBEAN PASSAGES FOR WEDNESDAY AND THURSDAY. WHILE BREAKING WAVE HEIGHTS ARE EXPECTED TO REMAIN JUST BELOW THE 10 FOOT HIGH SURF ADVISORY CRITERIA...DANGEROUS RIP CURRENTS ARE LIKELY ALONG THE NORTHERN EXPOSED COASTLINES OF THE LOCAL ISLANDS. .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF HEAVY RAINFALL OR FLOODING WOULD BE GREATLY APPRECIATED.
The San Juan radar (TJUA), 82 km away, was scanning. The volume nearest the first event began at 01:05 UTC.
2 flash flood, 1 heavy rain. Local standard time, as filed.
Urban flooding was reported in Palo Alto sector and the flooding of a house in Barrio Islote at Urb. Costas del Atlantico in Arecibo.
Flooding was reported at the end of road 690 in the Cerro Gordo sector of the municipality of Vega Alta.
Road 53 was reported flooded in the municipality of Fajardo.
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: 274423, 273971, 274427.