A surge of low level moisture in the prevailing east northeast wind flow resulted in isolated to scattered showers with thunderstorms over the Western Interior section 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.
A surge of low level moisture in the prevailing east northeast wind flow resulted in isolated to scattered showers with thunderstorms over the Western Interior section 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 Apr 28, 3:08 PM AST, 4 hours 4 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
308 PM AST SUN APR 28 2013
.SYNOPSIS...ZONAL FLOW WILL PREVAIL THROUGH NEXT WEEKEND. MODERATE
TRADE WINDS WILL PERSIST THRU MID WEEK WITH SERLY FLOW DEVELOPING
AT THE END OF THE WEEK.
&&
.DISCUSSION...MODELS SHOW MID LEVEL DRYING TAKING PLACE THROUGH
WED AS JET STREAK LIFTS TO THE NORTHEAST. BUT EXPECT SCT SHOWERS
AND THUNDERSTORMS EACH AFTERNOON AIDED BY DAYTIME HEATING AND
INSTABILITY. THE SHOWERS COULD BE VERY SLOW MOVERS AS STEERING
CURRENTS COLLAPSE. MOISTURE BEGINS TO INCREASE THU AND DEEPENS
FURTHER THROUGH THE END OF THE WEEK AS SERLY FLOW DEVELOPS. EXPECT
CLOUDY AND SHOWERY CONDITIONS NEXT WEEKEND. THERE IS A TROUGH FCST
TO PASS TO THE NORTH OF THE AREA WHICH COULD ADD SOME ENHANCEMENT
BUT A 850 AND 700 THERE IS STRONG RIDGING WHICH COULD BE AN
INHIBITING FACTOR FOR A SIG HEAVY RAINFALL EVENT.
&&
.AVIATION...MOSTLY VFR CONDITIONS EXPECTED ACROSS THE LOCAL TERMINALS
FOR THE NEXT 24 HOURS. HOWEVER...SHRA/TSRA DEVELOPMENT ACROSS THE
INTERIOR OF PR IS CAUSING MTN OBSCURATIONS AND THIS ACTIVITY MAY
MOVE SOUTH LATER IN THE AFTERNOON...POSSIBLY CAUSING MVFR CONDITIONS
ACROSS TJPS BEFORE 29/00Z. SURFACE WINDS WILL BE FROM THE EAST
NORTHEAST AT AROUND 10 KTS...DECREASING TO UNDER 10 KTS OVERNIGHT.
&&
.MARINE...SEAS REMAIN IN THE 6-8 FT RANGE IN NORTHEAST SWELLS.
SWELLS WILL BE VERY SLOW TO SUBSIDE OVR THE NEXT 2-4 DAYS BUT
EXPECT A SLOW IMPROVEMENT STARTING LATE TONIGHT.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 74 85 74 85 / 30 30 20 20
STT 75 85 75 86 / 10 10 20 20
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...HIGH SURF ADVISORY UNTIL 3 AM AST MONDAY FOR CULEBRA-NORTH
CENTRAL-NORTHEAST-NORTHWEST-SAN JUAN AND VICINITY-SOUTHEAST-
WESTERN INTERIOR.
VI...HIGH SURF ADVISORY UNTIL 3 AM AST MONDAY FOR ST CROIX-ST.
THOMAS/ST. JOHN/ADJACENT ISLANDS.
COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 3 AM AST TUESDAY FOR ANEGADA PASSAGE
SOUTHWARD TO 17N-CARIBBEAN WATERS OF PUERTO RICO FROM 10 NM
TO 17N-COASTAL WATERS OF NORTHERN PUERTO RICO OUT 10 NM-
COASTAL WATERS OF NORTHERN USVI AND CULEBRA OUT 10 NM-
COASTAL WATERS OF SOUTHERN USVI VIEQUES AND EASTERN PUERTO
RICO OUT 10 NM-MONA PASSAGE SOUTHWARD TO 17N.
SMALL CRAFT ADVISORY UNTIL 9 AM AST MONDAY FOR COASTAL WATERS OF
NORTHWESTERN PUERTO RICO OUT 10 NM.
SMALL CRAFT ADVISORY UNTIL 9 AM AST TUESDAY FOR ATLC WATERS OF
PUERTO RICO AND USVI FROM 10NM TO 19.5N.
&&
25/64HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 607 AM AST SUN APR 28 2013 AMZ710>745-PRZ001>013-291015- 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- 607 AM AST SUN APR 28 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT LONG PERIOD...NORTHEAST SWELLS WILL CONTINUE TO AFFECT THE NORTHERN AND NORTHEAST EXPOSURES OF ALL LOCAL ISLANDS. THESE LONG NORTHEAST SWELLS AVERAGING 15 AND 17 SECONDS ARE EXPECTED TO CONTINUE TODAY AND TONIGHT WHILE SLOWLY SUBSIDE THROUGH MONDAY MORNING...MAKING MARINE CONDITIONS HAZARDOUS. THESE LONG PERIOD SWELLS WILL PRODUCE LARGE BREAKING 14 TO 17 FEET OR HIGHER ALONG THE LOCAL REEFS...BEACHES AND SHOALS OF THE LOCAL ISLANDS THROUGH AT LEAST MONDAY MORNING. THESE BREAKING WAVES WILL GENERATE STRONG AND DANGEROUS CURRENTS WITHIN THE SURF ZONE...CALLED RIP CURRENTS. THESE NARROW OUTWARD FLOWING CURRENTS CAN CARRY PEOPLE AND ANIMALS AWAY FROM THE COAST LINE AND OUT TO SEA. IF YOU BECOME CAUGHT IN A RIP CURRENT...DO NOT PANIC. CALMLY...REMAIN AFLOAT...GATHER YOUR BEARINGS RELATIVE TO THE BEACH...AND SWIM PARALLEL TO THE BEACH. YOU WILL EVENTUALLY LEAVE THE GRIP OF THIS NARROW CURRENT...AND BE ABLE TO SAFELY SWIM TO SHORE. LOCAL BEACH GOERS...AND INEXPERIENCED SURFERS AND SWIMMERS ARE URGED TO STAY OUT OF THE WATER UNTIL THESE HAZARDOUS SURF CONDITIONS SUBSIDE. PERSONS ON THE BEACH SHOULD BE VIGILANT FOR LARGE BREAKING WAVES SURGING UPON THE SHORE...WHICH CAN CARRY PEOPLE OF ALL SIZES INTO THE OCEAN. YOU SHOULD AVOID BEING NEAR THE SHORE LINE AND STAY OFF OF ROCK FORMATIONS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY LONG PERIOD...NORTHEAST SWELLS WILL CONTINUE TO AFFECT THE NORTHERN AND NORTHEAST EXPOSURES OF ALL LOCAL ISLANDS UNTIL MONDAY MORNING. .SPOTTER INFORMATION STATEMENT... INFORMATION ABOUT SEAS AND SWELLS ARE WELCOME. AMZ715-725-VIZ001-002-291015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 607 AM AST SUN APR 28 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT LONG PERIOD...NORTHEAST SWELLS WILL CONTINUE TO AFFECT THE NORTHERN AND NORTHEAST EXPOSURES OF ALL LOCAL ISLANDS. THESE LONG NORTHEAST SWELLS AVERAGING 15 AND 17 SECONDS ARE EXPECTED TO CONTINUE TODAY AND TONIGHT WHILE SLOWLY SUBSIDE THROUGH MONDAY MORNING...MAKING MARINE CONDITIONS HAZARDOUS. THESE LONG PERIOD SWELLS WILL PRODUCE LARGE BREAKING 14 TO 17 FEET OR HIGHER ALONG THE LOCAL REEFS...BEACHES AND SHOALS OF THE LOCAL ISLANDS THROUGH AT LEAST MONDAY MORNING. THESE BREAKING WAVES WILL GENERATE STRONG AND DANGEROUS CURRENTS WITHIN THE SURF ZONE...CALLED RIP CURRENTS. THESE NARROW OUTWARD FLOWING CURRENTS CAN CARRY PEOPLE AND ANIMALS AWAY FROM THE COAST LINE AND OUT TO SEA. IF YOU BECOME CAUGHT IN A RIP CURRENT...DO NOT PANIC. CALMLY...REMAIN AFLOAT...GATHER YOUR BEARINGS RELATIVE TO THE BEACH...AND SWIM PARALLEL TO THE BEACH. YOU WILL EVENTUALLY LEAVE THE GRIP OF THIS NARROW CURRENT...AND BE ABLE TO SAFELY SWIM TO SHORE. LOCAL BEACH GOERS...AND INEXPERIENCED SURFERS AND SWIMMERS ARE URGED TO STAY OUT OF THE WATER UNTIL THESE HAZARDOUS SURF CONDITIONS SUBSIDE. PERSONS ON THE BEACH SHOULD BE VIGILANT FOR LARGE BREAKING WAVES SURGING UPON THE SHORE...WHICH CAN CARRY PEOPLE OF ALL SIZES INTO THE OCEAN. YOU SHOULD AVOID BEING NEAR THE SHORE LINE AND STAY OFF OF ROCK FORMATIONS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY LONG PERIOD...NORTHEAST SWELLS WILL CONTINUE TO AFFECT THE NORTHERN AND NORTHEAST EXPOSURES OF ALL LOCAL ISLANDS UNTIL MONDAY MORNING. .SPOTTER INFORMATION STATEMENT... INFORMATION ABOUT SEAS AND SWELLS ARE WELCOME.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
359 PM AST SUN APR 28 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0100 PM HIGH SURF ARECIBO 18.46N 66.74W
04/28/2013 ARECIBO PR EMERGENCY MNGR
*** 1 FATAL, 3 INJ *** ONE FEMALE DROWNED AND THREE MEN
WERE INJURED DUE TO HIGH SURF CONDITIONS AT CUEVA DEL
INDIO.
&&
FCASTROThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Barrio Pueblo, Barrio Seburuquillo and Barrio Guajataca were reported flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2013Every state in 2013This day in weather historyWarnings in Puerto Rico, April 2013
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: 449211.