An upper level trough combined with ample low level moisture,daytime heating and local effect to produced scattered to numerous showers and thunderstorms mainly in the northern half of Puerto Rico.
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 ample low level moisture,daytime heating and local effect to produced scattered to numerous showers and thunderstorms mainly in the northern half 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 May 1, 3:13 PM AST, 2 hours 57 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 313 PM AST WED MAY 1 2013 .SYNOPSIS...BROAD TROUGH WILL DOMINATE THE WCNTRL ATLC THRU SUN. MID LEVEL RIDGE WILL BUILD OVER THE REGION EARLY NEXT WEEK. && .DISCUSSION...DEEP MOISTURE OVER THE LESSER ANTILLES WILL BE DRAWN NWWD INTO FAR ERN PR...USVI AND BVI OVERNIGHT AND THU AS TROUGH ACROSS THE ATLC DEEPENS WITH SHOWERS AND THUNDERSTORMS EXPECTED TO BECOME MORE NUMEROUS OVERNIGHT. EXPECT TOMORROW TO SEE A SIG CHANGE IN STEERING WINDS FROM WSW TO ENE AFFECTING NORTHEAST PR WITH THE BULK OF THE RAIN AFFECTING VIEQUES...AND THE USVI ESPECIALLY ST. CROIX. WEEKEND FCST...OVERALL WEATHER LOOKS FAIRLY ACTIVE MAINLY ACROSS NCNTRL AND NE PR UNDER A BROAD TROF PATTERN WITH DEEP MOISTURE AND INSTABILITY. BY TUE...MODELS SHOW RISING MID LEVEL HEIGHTS WITH SIG DRYING. SO DONT EXPECT MUCH IMPROVEMENT UNTIL THEN. && .AVIATION...VFR CONDITIONS OVR MAINLAND PR TONIGHT BUT SHOWERS AND THUNDERSTORMS ARE LIKELY TO AFFECT THE USVI AND LEEWARD ISLANDS LATE TONIGHT INTO FRI WITH MVFR CONDITIONS. && .MARINE...SEAS WILL SLOWLY SUBSIDE OVR THE NEXT FIVE DAYS WITH 3-5 FT. TSTMS WILL BE THE MAIN THREAT. && .PRELIMINARY POINT TEMPS/POPS... SJU 75 85 76 84 / 50 70 10 70 STT 74 84 77 81 / 50 100 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 10/64
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 610 AM AST WED MAY 1 2013 AMZ710>745-PRZ001>013-021015- 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- 610 AM AST WED MAY 1 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 ACROSS PUERTO RICO EXCEPT SCATTERED NEAR THE SOUTH COAST. FLOODING OF URBAN AREAS AND SMALL STREAMS ARE POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE THREAT OF FLOODING MAY INCREASE THURSDAY AND POSSIBLY THROUGH THE WEEKEND. MOISTURE FROM THE CARIBBEAN WILL INCREASE AND CAUSE CONTINUED HEAVY DOWNPOURS EACH AFTERNOON AFTER SOILS HAVE BEEN SATURATED FROM EARLIER RAINS. .SPOTTER INFORMATION STATEMENT...INFORMATION ABOUT LOCALLY HEAVY RAINFALL AND FLOODING WOULD BE APPRECIATED. AMZ715-725-VIZ001-002-021015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 610 AM AST WED MAY 1 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...THURSDAY THROUGH TUESDAY AREAS OF FLOODING ARE POSSIBLE AT TIMES ON THURSDAY AND THROUGH THE WEEKEND AS MOISTURE CONTINUES TO INCREASE FROM THE CARIBBEAN. HEAVY DOWNPOURS WILL BE POSSIBLE EACH AFTERNOON AFTER EARLIER RAINS HAVE SATURATED THE SOILS. .SPOTTER INFORMATION STATEMENT...INFORMATION ABOUT LOCALLY HEAVY RAINFALL AND FLOODING WOULD BE APPRECIATED.
The national radar mosaic for the moment the first event began.
1 flood, 1 heavy rain. Local standard time, as filed.
Areas of road PR-2 were reported flooded. Some business were affected.
A landslide was reported on Road PR-146 from Ciales to Utuado.
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, May 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: 450561, 450562.