Lingering moisture from an old frontal boundary combined with favorable mid and upper atmospheric conditions to produce showers and some thunderstorms across the north central sections of Puerto Rico during the 9-10 February. Heavy rains fell along the north coast during Monday night February 9 through Tuesday morning February 10.
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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.
Lingering moisture from an old frontal boundary combined with favorable mid and upper atmospheric conditions to produce showers and some thunderstorms across the north central sections of Puerto Rico during the 9-10 February. Heavy rains fell along the north coast during Monday night February 9 through Tuesday morning February 10. This event resulted in reports of over 5 inches of rainfall which caused flooding in the Toa Baja Dorado area on over into Camuy and Barceloneta. The Rio Camuy experienced bankful conditions during this rain event. Some homes were reported flooded in Dorado.
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 Feb 9, 11:33 PM AST, 1 hour 47 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN JUAN PR
1133 PM AST MON FEB 9 2009
.UPDATE...BY FEBRUARY STANDARDS...HAD A VERY ACTIVE EVENING ALONG
THE NORTH COASTAL SECTIONS OF PUERTO RICO...PARTICULARLY THE NORTH
CENTRAL ZONE. LEFTOVER MOISTURE FROM OLD BOUNDARY COMBINED WITH
LOW LEVEL CONVERGENCE...MID LEVEL TROUGHING JUST TO OUR WEST AND
UPPER LEVEL SPEED DIVERGENCE...TO PRODUCE A GOOD DEAL OF
CLOUDINESS...SHOWERS AND A COUPLE OF THUNDERSTORMS OVER PARTS OF
THE LOCAL ISLANDS. WSR-88D TRENDS DURING THE PAST 1 TO 2 HOURS HAS
BEEN FOR ACTIVITY ALONG THE WESTERN THIRD OF THE NORTH COAST TO
DIMINISH AND SHIFT OFF THE COAST...WHILE NEW SHOWERS DEVELOP OVER
THE EASTERN TWO-THIRDS. EXPECT THIS MORE ORGANIZED ACTIVITY TO
LINGER AWHILE LONGER BEFORE GRADUALLY DIMINISHING...BUT WILL
PROBABLY HAVE SCATTERED TO LOCALLY NUMEROUS SHOWERS AFFECTING PARTS
OF THE NORTH COAST OF PUERTO RICO MOST OF THE NIGHT. INHERITED
SHORT TERM GRIDS AND ZFP HAD GOOD HANDLE ON EXPECTED CONDITIONS
OVERNIGHT...BUT WE SENT AN UPDATE TO BOTH TO ALTER WEATHER...SKY
COVER...POPS AND WINDS IN MANY ZONES AND TO JUST KEEP FORECAST
CURRENT WITH ONGOING CONDITIONS. FOR THE COASTAL WATERS...MADE A
COUPLE OF MINOR ALTERATIONS TO THE PREVIOUS CWF...OTHERWISE NO
CHANGES. A SMALL CRAFT ADVISORY IS IN EFFECT FOR MOST OF THE LOCAL
COASTAL WATERS OVERNIGHT. AVIATION-WISE...EXPECT PREVAILING VFR
CONDITIONS TO CONTINUE ACROSS THE LOCAL ISLANDS AND AT MOST LOCAL
TAF SITES OVERNIGHT. HOWEVER...THERE WILL CONTINUE TO BE
MULTI-LAYERED CLOUDINESS...WITH MORE FREQUENT THAN NORMAL MVFR
AND EVEN BRIEF IFR CONDITIONS...STRONG AND GUSTY LOW LEVEL WINDS
AND MOUNTAIN OBSCURATIONS IN SCATTERED TO NUMEROUS SHOWERS AND
ISOLATED THUNDERSTORMS./ BCS
REMAINDER BELOW UNCHANGED FROM THE DAY SHIFT.
&&
.PREV DISCUSSION... /ISSUED 321 PM AST MON FEB 9 2009/
SYNOPSIS...LOW-LVL TROUGH NOW OVR THE MONA PASSAGE BUT WILL
WEAKEN OVER THE NEXT DAY OR SO. HIGH PRES WILL BUILD NORTH OF THE
REGION MID WEEK BRINGING DRY AND WINDY CONDITIONS.
DISCUSSION...SATELLITE AND RADAR IMAGERY SHOW LOW LEVEL TROUGH
NOW LOCATED ROUGHLY OVER THE MONA PASSAGE/EASTERN DR...SLOWLY
LIFTING WNW. BEST FORCING STILL REMAINS NORTH OF PUERTO RICO OVER
THE OFFSHORE ATLC WATERS IN THE FAVORABLE EASTERN SIDE OF U/L
TROUGH. EXPECT MID TO U/L LEVEL DYNAMICS AND MOST SHOWER ACTIVITY
TO REMAIN NORTH OF PUERTO RICO...SO POPS WILL BE OVER THE NORTH
COAST AND MONA PASSAGE AREA OVERNIGHT. BY EARLY TUESDAY
MORNING...SOMEWHAT DRIER FLOW SHOULD WORK IN AT THE LOWER LEVELS
AS THE TROUGH CONTINUES TO MOVE WESTWARD. HOWEVER...STRENGTHENING
HIGH PRESSURE OVER THE SW ATLC AT THAT TIME WILL FORCE REMNANT
MOISTURE FROM THE OLD FRONTAL BOUNDARY AND CURRENT TROUGH OVERHEAD
THROUGH TUESDAY NIGHT. NOT LOOKING FOR AS ACTIVE A DAY
TUESDAY...BUT STILL ENOUGH MOISTURE FOR VARIABLY CLOUDY WITH
SCATTERED SHOWERS.
BY WEDNESDAY...DEEP LAYERED STRONG HIGH PRESSURE OVER THE SW ATLC
WILL HAVE CLEARED MOISTURE COMPLETELY OUT OF THE AREA. GFS MOS
GUIDANCE TAKING DEW POINTS DOWN TO THE MID TO UPPER 60S STARTING
EARLY WEDNESDAY. WEDNESDAY THROUGH THE WEEKEND LOOKS LIKE A RETURN
TO BEAUTIFUL CARIBBEAN WINTER WEATHER.
AVIATION...BEST CHANCE FOR SHRAS AND MVFR CIGS REMAINDER OF THIS
AFTERNOON AND EVENING IS AT TJBQ WITH CONVECTION OF WRN PR DRIFTING
NW. AFTER THAT VFR CONDITIONS EXPECTED NEXT 24 HRS.
MARINE...ALL NORTHERLY SWELL ENERGY FROM THE PREVIOUS EVENT IS
GONE...LEAVING MORE LOCALLY GENERATED ENE WIND WAVES AT AROUND 8 TO
9 SECONDS. BUOY 41403 IS SHOWING 8 TO 9 FOOT WAVE HEIGHTS. EXPECT
THIS SCENARIO TO CONTINUE THROUGH TUESDAY AFTERNOON WITH SCA
CONDITIONS OVER THE ATLC AND PASSAGES. AFTERWARD...WINDS INCREASE
SUBSTANTIALLY INTO THE 20 TO 25 KNOT RANGE LATE TUE THROUGH THURSDAY
AND SEAS WILL INCREASE AS A RESULT. 8 TO 10 FOOT SEAS OVER MOST NON
PROTECTED WATERS UNTIL THURSDAY.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 74 83 72 83 / 60 40 40 20
STT 74 83 72 83 / 70 40 30 30
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...SMALL CRAFT ADVISORY AMZ710...712...715...722...725...732...741
AND 742 FROM 8 AM AST TUESDAY.
VI...SMALL CRAFT ADVISORY AMZ710...712...715...722...725 AND 732.
&&The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Four homes were reported flooded at Barrio Higuillar in the municipality of Dorado.
Road 690 near Barrio Carmelitas, and La Baranda sector of Cerro Gordo community were reported flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2009Every state in 2009This day in weather historyWarnings in Puerto Rico, February 2009
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: 156993, 156990.