An upper level trough combined with daytime heating, sea breeze convergence and light surface winds to produce scattered to numerous showers with isolated thunderstorms across the San Juan metro area.
Every event with a place to put it. Tap one for its entry below.
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.
An upper level trough combined with daytime heating, sea breeze convergence and light surface winds to produce scattered to numerous showers with isolated thunderstorms across the San Juan metro area.
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 30, 12:23 PM AST, 1 hour 43 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE SAN JUAN PR 1223 PM AST TUE APR 30 2013 .SYNOPSIS...SATELLITE AND RADAR IMAGERY SHOWED SCATTERED SHOWERS AFFECTING THE PORTIONS OF THE USVI AND EASTERN PUERTO RICO LATE THIS MORNING. FOR THIS AFTERNOON...A LIGHT STEERING FLOW WILL COMBINE WITH AVAILABLE MOISTURE...SEA BREEZE CONVERGENCE AND GOOD VENTILATION ALOFT TO PRODUCE INTENSE AND SLOW MOVING SHOWERS AND THUNDERSTORMS ACROSS THE CORDILLERA CENTRAL AND WEST SECTIONS OF PR THIS AFTERNOON. SOME RAINS COULD BE LOCALLY HEAVY AND MAY INDUCE URBAN AND SMALL STREAM FLOODING. && .AVIATION...SHRA/ISOLD TSRA DEVELOPMENT WILL LEAD TO INCR CLOUDINESS ACROSS THE CORDILLERA CENTRAL AND WEST SECTIONS OF PUERTO RICO. THIS MAY RESULT IN BRIEF MVFR CONDS IN AND AROUND TJSJ...TJMZ AND TJPS. && .MARINE...THE NORTHEAST SWELL WILL CONTINUE TO SUBSIDE SLOWLY ACROSS THE ATLANTIC WATERS AND THE ANEGADA PASSAGE OVER THE NEW FEW DAYS. NO SIGNIFICANT SWELLS ARE IN STORE FOR THE REST OF THE WEEK. && .PREV DISCUSSION... /ISSUED 509 AM AST TUE APR 30 2013/ SYNOPSIS...AT UPPER LEVELS...A STRONG JET WILL REMAIN NORTH OF THE LOCAL AREA BUT WINDS OVER SAN JUAN AND PUERTO RICO AND THE U.S. VIRGIN ISLANDS IN GENERAL WILL REMAIN ABOVE 50 KNOTS THROUGH AT LEAST SUNDAY IN WEST SOUTHWEST TO WEST NORTHWEST FLOW. LOW PRESSURE OVER THE WESTERN ATLANTIC WILL DROP DOWN TO 35 NORTH 55 WEST BY MONDAY BEFORE PULLING OUT AGAIN. AT MID LEVELS...THE RIDGE OVER THE WESTERN ATLANTIC WILL FADE WHILE LOW PRESSURE DOMINATES THE CENTRAL ATLANTIC. ON THURSDAY THE TROUGH WILL STRENGTHEN NORTH OF THE AREA UNTIL WEAK RIDGING BEGINS FORMING OVER THE WESTERN ATLANTIC AGAIN EARLY NEXT WEEK. AT LOWER LEVELS...A MULTI-CENTERED LOW WILL DOMINATE THE CENTRAL ATLANTIC. A TROUGH EXTENDING SOUTHWEST OF IT WILL JOIN WITH A WEAKER LOW IN THE SOUTH CENTRAL CARIBBEAN SUCH THAT THE LOCAL AREA IS AFFECTED BY THIS TROUGHING THROUGH TUESDAY OF NEXT WEEK. A WEAK LOW WILL FORM JUST EAST OF GEORGIA TODAY AND THEN DRIFT SOUTHEAST THROUGH WEDNESDAY NIGHT TO BECOME ABSORBED INTO THE LOW. GOOD MOISTURE MOVES AROUND THE LOW IN THE CARIBBEAN AND AFFECTS PUERTO RICO AND THE U.S. VIRGIN ISLANDS THROUGH MUCH OF NEXT WEEK. HIGH PRESSURE AT LOW LEVELS OVER THE TROPICAL ATLANTIC WILL PULL MOISTURE OVER THE AREA SATURDAY AND SUNDAY. IT DRIFTS EAST OF THE AREA ON MONDAY AND TUESDAY BUT RETURNS MID WEEK NEXT WEEK. DISCUSSION...A FEW SHOWERS OVER THE ATLANTIC HAVE MOVED INLAND OVER PUERTO RICO AND HAVE DAMPENED THE NORTH AND EAST COASTS...HOWEVER MUCH LESS RAIN FELL THIS MORNING THAN DURING MONDAY MORNING. MOISTURE OVER THE SOUTHERN WINDWARD ISLANDS WILL MOVE OVER THE AREA LATER THIS WEEK BRINGING HEAVY AND PERSISTENT RAIN TO PUERTO RICO AND THE U.S. VIRGIN ISLANDS. ALTHOUGH IT MOVES OVER THE LEEWARD ISLANDS EARLY IN THE WEEK IT RETURNS ON WEDNESDAY OF NEXT WEEK. THIS CONTINUES A TREND OF BOTH AN EASTERLY SHIFT AND POSTPONEMENT OF THE WETTEST CONDITIONS. THE 30/00Z GFS RUN SHOWS A PEAK IN THE PRECIPITABLE WATER ON FRIDAY AND ON SUNDAY WITH A DIP ON MONDAY AND A NEW BETTER SURGE ON TUESDAY. ACCORDING TO THE GFS PRECIPITABLE WATER IS TO REMAIN BELOW 2 INCHES UNTIL AT LEAST MONDAY. MODEL GENERATED SOUNDINGS OVER THE AREA SHOW NOT QUITE AS MUCH MOISTURE AS IN THE PREVIOUS SOUNDINGS...BUT SUFFICIENT MOISTURE REMAINS FOR FLOODING TO REMAIN LIKELY OVER THE WEEKEND. BECAUSE OF THE EAST WARD SHIFT OF THE MOISTURE PLUME...IT IS LIKELY THAT PUERTO RICO WILL SEE A LITTLE LESS OVERALL RAIN THAN EARLIER ANTICIPATED SINCE THE PLUME RESIDES OVER THE U.S. VIRGIN ISLANDS LONGER THAN BEFORE...HOWEVER SOUNDINGS OVER THE WEEKEND SHOW A SHIFT OUT OF THE EASTERLIES TOWARD SOUTHERLY FLOW FRIDAY AND SATURDAY. THIS NOT ONLY BRINGS MOISTURE UP FROM THE ITCZ BUT CONTRIBUTES TO SOME OVERALL ORGANIZATION IN A GENERALLY LIGHT LOW LEVEL WIND ENVIRONMENT THAT WE MUST CONTINUE TO MONITOR FOR THE POSSIBILITY OF FLASH FLOODING AND MAIN-STEM RIVER FLOODING. ALTHOUGH IT IS STILL TOO SOON TO KNOW WITH ANY CERTAINTY THAT HEAVY RAINS WILL PERSIST DURING THE WEEKEND AND MID WEEK NEXT WEEK OR TO PREPARE FOR SUCH AN EVENTUALITY...RESIDENTS AND EMERGENCY MANAGEMENT OFFICIALS SHOULD REVIEW THEIR FLOOD OPERATIONAL PLANS AND MAKE SURE THAT NECESSARY RESOURCES WILL BE AVAILABLE IF NEEDED. IT STILL APPEARS THAT SOME FLOODING...ESPECIALLY IN MOUNTAINOUS AREAS IS INEVITABLE AND SOILS ARE BEGINNING TO SATURATE DUE TO THE HEAVY RAINS OF THE LAST FEW DAYS. AVIATION...VFR CONT TO DOMINATE. ISOLD SHRA MAINLY OFFSHORE THIS MORNING. NRMS SHRA/SCT TSTM MAIN LY INLAND BY AFT WITH OCNL IFR/MVFR/ OBSCG MTNS. HIGH CHC OF SHRA/TSTM AT TJMZ...WL PROB UPDATE THERE FOR AFT ACTIVITY. LLVL WIND E 5-15 KT BLO FL080 BCMG W AND INCR SPD ABV. MARINE...SEAS WERE ALMOST 7 FEET AT BUOY 41043 AND HAD DROPPED UNDER 6 FEET AT THE SAN JUAN BUOY 41053. CONDITIONS ARE EXPECTED TO IMPROVE UNTIL SUNDAY. THE SMALL CRAFT ADVISORY WILL BE DROPPED AT 9 AM AST PROVIDING SEAS REMAIN AT OR BELOW CURRENT LEVELS. && .PRELIMINARY POINT TEMPS/POPS... SJU 84 75 85 75 / 30 20 20 20 STT 85 75 85 76 / 20 20 20 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 11/64
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 546 AM AST TUE APR 30 2013 AMZ710>745-PRZ001>013-011000- 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- 546 AM AST TUE APR 30 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS ARE EXPECTED AGAIN THIS AFTERNOON FROM THE WEST CENTRAL COAST OF PUERTO RICO... EASTWARD THROUGH THE INTERIOR OF THE ISLAND TO VIEQUES AND CULEBRA. MINOR FLOODING OF SMALL STREAMS AND URBAN AREAS ARE POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY MODEL GUIDANCE CONTINUES TO SUGGEST INCREASING TROPICAL MOISTURE AND UNSTABLE CONDITIONS TOWARDS THE END OF THIS WEEK. IT MAY LEAD TO MORE ACTIVE CONVECTIVE WEATHER CONDITIONS AND A MUCH WETTER WEATHER PATTERN ACROSS THE REGION...RESULTING IN AN INCREASED FLOODING THREAT. .SPOTTER INFORMATION STATEMENT...INFORMATION ABOUT LOCALLY HEAVY RAINFALL AND FLOODING WOULD BE APPRECIATED. AMZ715-725-VIZ001-002-011000- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 546 AM AST TUE APR 30 2013 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...WEDNESDAY THROUGH MONDAY MODEL GUIDANCE CONTINUES TO SUGGEST INCREASING TROPICAL MOISTURE AND UNSTABLE CONDITIONS TOWARDS THE END OF THIS WEEK. IT MAY LEAD TO MORE ACTIVE CONVECTIVE WEATHER CONDITIONS AND A MUCH WETTER WEATHER PATTERN ACROSS THE REGION...RESULTING IN AN INCREASED FLOODING THREAT. .SPOTTER INFORMATION STATEMENT...INFORMATION ABOUT LOCALLY HEAVY RAINFALL AND FLOODING WOULD BE APPRECIATED.
The San Juan radar (TJUA), 33 km away, was scanning. The volume nearest the first event began at 18:03 UTC.
8 flash flood, 1 flood. Local standard time, as filed.
De Diego Avenue intersection with Roosevelt avenue was reported flooded.
Road in front of Garden Hill Shopping center was reported flooded and closed. Also, Martinez Nadal Avenue was closed.
Kennedy Avenue was closed due to flooding near Metro Office building.
Kennedy Avenue was reported flooded with cars stranded.
Kennedy Avenue flooded at Exit 6 toward San Juan.
San Patricio shopping center was reported flooded.
Roosevelt avenue in Front of San Patricio Shopping center was flooded and impaddable.
Roosevelt avenue in Front of San Patricio Shopping center was flooded and impassable.
Esmeralda Avenue was 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: 449891, 449609, 449852, 449872, 449880, 449888, 449889, 449890, 449619.