Light winds combined with daytime heating and local effect to produce scattered showers with thunderstorms along the north coast 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.
Light winds combined with daytime heating and local effect to produce scattered showers with thunderstorms along the north coast 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 Nov 18, 2:50 PM AST, 2 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 250 PM AST SUN NOV 18 2012 .SYNOPSIS...HIGH PRESSURE ACROSS THE CENTRAL ATLANTIC...WILL MAINTAIN A LIGHT TO MODERATE TRADE WIND FLOW ACROSS THE REGIONAL WATERS THROUGH AT LEAST MONDAY NIGHT. PRESSURE GRADIENT WILL RELAX TUESDAY AS AN AREA OF LOW PRESSURE PASS TO OUR NORTH. A FRONTAL BOUNDARY IS EXPECTED TO APPROACH THE REGION MID WEEK. HIGH PRESSURE WILL ESTABLISH BEHIND THIS FRONTAL BOUNDARY BY LATE IN THE WEEK. && .DISCUSSION...ONCE AGAIN...MOSTLY SUNNY SKIES PREVAILED ACROSS MOST OF PUERTO RICO...CULEBRA...VIEQUES AND THE U.S. VIRGIN ISLANDS THIS MORNING AND EARLY AFTERNOON. ONLY ISOLATED PASSING SHOWERS WERE NOTED MAINLY OVER THE COASTAL WATERS. LATE IN THE AFTERNOON HOURS...SHOWERS WITH ISOLATED THUNDERSTORMS DEVELOPED MAINLY OVER THE NORTHWEST SECTION OF PUERTO RICO. A SURFACE HIGH PRESSURE ACROSS THE CENTRAL ATLANTIC WILL CONTINUE TO DOMINATE THE LOCAL REGION THROUGH AT LEAST MONDAY NIGHT. THIS PATTERN WILL MAINTAIN RELATIVELY DRY CONDITIONS ACROSS THE REGION. FOR TUESDAY...A SURFACE LOW PRESSURE IS EXPECTED TO INTENSIFIES ACROSS THE WESTERN ATLANTIC. AS THIS LOW MOVE TO OUR NORTH...AND SLOWLY MOVES TOWARD THE NORTHEAST...LOCAL REGION WILL REMAIN IN A COL AREA WITH VERY LIGHT WINDS AT THE SURFACE. WINDS ARE EXPECTED TO EVEN SHIFT SOUTH AND SOUTHWEST BY THE END OF THE WEEK...AS A FRONTAL BOUNDARY ASSOCIATED WITH THIS LOW...APPROACHES THE REGION FROM THE NORTHWEST. AT THIS MOMENT...THE FRONTAL BOUNDARY ITSELF IS NOT EXPECTED TO PRODUCE ACTIVE WEATHER ACROSS THE REGION. HOWEVER...AT THE END OF THE WEEK...MODELS SUGGEST AN INCREASE IN MOISTURE AS THIS BOUNDARY MOVES OVER THE AREA...AS A STRONG HIGH PRESSURE PUSH THE REMNANTS OF THIS FRONTAL BOUNDARY OVER THE REGION...AND CONVERGE WITH THE SOUTHWEST WIND FLOW AT THE SURFACE. IN THE LONG TERM...PW VALUES ARE FORECAST TO DROP AS LOW AS 0.8 INCHES BY NEXT WEEKEND WHICH...IF VERIFIES...WILL RESULT IN VERY LITTLE SHOWER ACTIVITY ACROSS THE AREA. STAY TUNED FOR FURTHER INFORMATION ON THE UPCOMING THANKSGIVING HOLIDAY WEEKEND FORECAST. && .AVIATION...SHOWERS IN THE VCNTY OF JMZ AND JBQ THRU 21Z WITH CIGS BKN040. UPPER LEVEL RIDGE WILL BREAK DOWN MON AS UPPER TROUGH BECOMES ESTABLISHED ACROSS THE WEST CNTRL ATLC. THIS TO WEAKEN MID LEVEL CAP AND ALLOW TSRA TO DEVELOP. && .PRELIMINARY POINT TEMPS/POPS... SJU 76 87 74 85 / 40 40 30 30 STT 77 86 75 85 / 60 60 30 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 64/71
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 537 AM AST SUN NOV 18 2012 AMZ710>745-PRZ001>013-190945- 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- 537 AM AST SUN NOV 18 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC 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. AMZ715-725-VIZ001-002-190945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 537 AM AST SUN NOV 18 2012 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 national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Road PR-2 between Arecibo and Hatillo was reported flooded and impassable.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2012Every state in 2012This day in weather historyWarnings in Puerto Rico, November 2012
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: 420910.