Moisture associated with an old frontal boundary just to the north northeast of the forecast area lingered across the region resulting in numerous showers and isolated thunderstorms.
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.
Moisture associated with an old frontal boundary just to the north northeast of the forecast area lingered across the region resulting in numerous showers and isolated thunderstorms.
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 22, 9:59 PM AST, 5 hours 32 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
959 PM AST FRI APR 22 2016
.UPDATE...SOUNDING CAME IN EXTREMELY WET WITH A PRECIPITABLE WATER
VALUE OF 2.34 INCHES. THIS MAY BE IN PART DUE TO THE CONVERGENCE
SETTING UP OVER THE NORTHERN PORTION OF PUERTO RICO THIS EVENING.
SHOWERS ARE STILL FORMING IN A WIDELY SCATTERED BAND OVER THE
CARIBBEAN EXTENDING ROUGHLY SOUTHWEST FROM SAINT CROIX...WHICH IS
MOVING NORTHWEST...AND SO OCCASIONAL RAIN AND SHOWERS ARE
EXPECTED TO CONTINUE THE MAJORITY OF THE NIGHT IN EASTERN AND
NORTH CENTRAL PUERTO RICO. THE U.S. VIRGIN ISLANDS ARE SEEING ONLY
ISOLATED SHOWERS AND THIS ALSO SHOULD CONTINUE FOR THE MOST PART.
THE BACK EDGE OF THE MOISTURE APPEARS TO ENTER FORECAST AREA
AROUND 23/15Z AND REACH THE SOUTHEAST COAST OF PUERTO RICO BY
24/00Z. SO...MUCH OF TOMORROW WILL BE CLOUDY AND RELATIVELY WET.
&&
.AVIATION...SCT-BKN CLD LYRS FL020...FL040...BKN-OVC FL080-120
WITH -RA/RA EN ROUTE BTW ISLANDS AND OVR NRN LEEWARDS. MOST TOPS
BLO 120 LOCAL TERMINALS PREVAILING VFR BUT BRIEF PRD MVFR DUE TO
LOW CIG AND OCNL RA DURG FCST PRD. MTN TOP OBSCR OVR CTRL AND ERN
PR TIL 23/14Z DUE TO LOW SCUD CLDS AND RA. LOW LEVEL WINDS FM THE
EAST AT 10-15 KTS...BCMG FM W AND INCR W/HT ABV FL150. SFC WND FM
E 10-15 KTS WITH HIGHER GUSTS IN PASSING SHRA.
&&
.MARINE...SEAS WILL RISE LATE TONIGHT AND THEN FALL OF DURING THE
DAY. EXPECT LOCAL WATERS TO BE CLEAR OF 7 FOOT SEAS AFTER 23/18Z.
AND SEAS WILL SUBSIDE AFTER THAT.
&&
.PREV DISCUSSION... /ISSUED 546 PM AST FRI APR 22 2016/
AVIATION UPDATE...SCT-BKN CLD LYRS FL020...FL040...BKN-OVC FL080-120
WITH -RA/RA EN ROUTE BTW ISLANDS AND OVR NRN LEEWARDS. MOST TOPS BLO
120. PREVAILING VFR MOST LOCAL TERMINALS...BUT BRIEF PRD OF MVFR DUE
TO LOW CIG AND OCNL -RA/RA. MTN TOP OBSCR DURG PRD OVR E AND CTRL
PR DUE TO LOW SCUD CLDS AND RA. AT TNCM AND TKPK EXPECT PREVAILING
MVFR CONDS IN -SHRA/SHRA AND LOW CIGS TIL AT LEAST 23/00Z. LOW LEVEL
WINDS FM THE EAST AT 10-15 KTS...BCMG FM W AND INCR W/HT ABV FL150.
SFC WND FM E 10-15 KTS WITH HIGHER GUSTS IN PASSING SHRA.
PREV DISCUSSION... /ISSUED 213 PM AST FRI APR 22 2016/
SYNOPSIS...BROAD DEEP LAYER LOW OVER THE NORTH CENTRAL ATLANTIC
IS SUSTAINING A FRONTAL BOUNDARY NORTH OF THE ISLANDS. THE BROAD
ANTICYCLONIC CIRCULATION OF THE LOW IS INDUCING A WESTERLY FLOW
ALOFT....MAINTAINING MOSTLY CLOUDY SKIES ACROSS THE REGION. WINDS
WILL VEER TO SOUTHEAST TONIGHT INTO SATURDAY AS SURFACE HIGH
PRESSURE MOVES EASTWARD FROM THE WESTERN ATLANTIC INTO THE CENTRAL
ATLANTIC. MORE STABLE AIR MASS WILL MOVE OVER THE REGION FROM SUNDAY
THROUGH EARLY NEXT WEEK...LIMITING THE SHOWER ACTIVITY ACROSS PR
AND USVI.
DISCUSSION...SATELLITE IMAGERY INDICATED MOSTLY CLOUDY SKIES
ACROSS THE REGION TODAY. THESE CLOUDS BLOCKED SOMEWHAT THE SOLAR
RADIATION...KEEPING THE MAXIMUM TEMPERATURES IN THE LOW 80S. SOME
SHOWERS ARE AFFECTING PORTIONS OF THE EASTERN HALF OF PUERTO RICO
AS A PATCHES OF MOISTURE HAS MOVED OVER THE USVI AND EASTERN PR.
LATE AFTERNOON SHOWERS STILL POSSIBLE OVER THE WEST INTERIOR AND
WEST PR.
SURFACE HIGH PRESSURE WILL MOVE SLOWLY EASTWARD INTO THE CENTRAL
ATLANTIC OVER THE NEXT FEW DAYS. THIS WILL INDUCE A SOUTHEAST FLOW
ACROSS THE ISLANDS TONIGHT. SOUTHEASTERLY WINDS WILL CONTINUE TO
BRING PATCHES OF MOISTURE ASSOCIATED WITH THE REMNANTS OF THE OLD
BOUNDARY OVER THE LOCAL ISLANDS THROUGH SATURDAY. AS A RESULT...
A FEW ROUNDS OF SCATTERED SHOWERS CAN BE EXPECTED ESPECIALLY OVER
EASTERN PR AND USVI AT NIGHT AND EARLY IN THE MORNING. ALSO...
AFTERNOON CONVECTION WILL LIKELY DEVELOP OVER THE NORTHWEST
QUADRANT OF PR ON SATURDAY AFTERNOON.
DRIER AND MORE STABLE AIR MASS WILL MOVE OVER THE REGION ON SUNDAY...
LIMITING THE SHOWER AND THUNDERSTORM ACTIVITY EARLY NEXT WEEK.
AVIATION...MAINLY VFR CONDITIONS WILL CONTINUE ACROSS THE LOCAL
FLYING AREA DURING THE FORECAST PERIOD. SCT-BKN CLOUD LAYERS BTW
FL030-FL150 WILL CONTINUE TO STREAM ACROSS THE FLYING AREA TONIGHT.
MVFR CONDITIONS STILL POSSIBLE AFTER 19Z AS SHRA IS EXPECTED TO
INCREASE MAINLY OVER WESTERN INTERIOR PR AND OVER THE CARIBBEAN
WATERS. LOW LEVEL WINDS FROM THE EAST AT 10-15 KNOTS WITH HIGHER
GUSTS.
MARINE...SEAS WILL INCREASE SLIGHTLY TONIGHT AS A BRIEF NORTHERLY
SWELL MOVES ACROSS THE ATLANTIC WATERS AND CARIBBEAN PASSAGES.
THEREFORE...A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE ATLANTIC
WATERS WATERS NORTH OF PUERTO RICO. MARINE CONDITIONS WILL IMPROVE
SIGNIFICANTLY NEXT WEEK WITH SEAS SUBSIDING AROUND 2-4 FEET.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 75 88 75 90 / 80 40 40 40
STT 76 86 74 85 / 50 40 50 50
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...HIGH RIP CURRENT RISK THROUGH LATE SATURDAY NIGHT FOR CULEBRA-
MAYAGUEZ AND VICINITY-NORTH CENTRAL-NORTHEAST-NORTHWEST-SAN
JUAN AND VICINITY-SOUTHEAST-WESTERN INTERIOR.
HIGH RIP CURRENT RISK FROM 8 AM AST SATURDAY THROUGH SATURDAY
AFTERNOON FOR VIEQUES.
VI...HIGH RIP CURRENT RISK THROUGH LATE SATURDAY NIGHT FOR ST.
THOMAS/ST. JOHN/ADJACENT ISLANDS.
AM...HIGH RIP CURRENT RISK THROUGH LATE SATURDAY NIGHT FOR COASTAL
WATERS OF NORTHERN USVI AND CULEBRA OUT 10 NM-COASTAL
WATERS OF SOUTHERN USVI VIEQUES AND EASTERN PUERTO RICO OUT
10 NM.
SMALL CRAFT ADVISORY UNTIL 8 AM AST SATURDAY FOR COASTAL WATERS
OF NORTHERN PUERTO RICO OUT 10 NM.
SMALL CRAFT ADVISORY UNTIL 2 PM AST SATURDAY FOR ATLC WATERS OF
PUERTO RICO AND USVI FROM 10NM TO 19.5N.
&&
09/12PERSPECTIVAS SOBRE CONDICIONES PELIGROSAS DEL TIEMPO...ACTUALIZADO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 519 PM AST VIERNES 22 DE ABRIL DE 2016 AMZ710>745-PRZ001>013-232130- SAN JUAN Y VECINDAD-NORESTE-SURESTE- INTERIOR ESTE-NORTE CENTRAL-INTERIOR CENTRAL-PONCE Y VECINDAD- NOROESTE-INTERIOR OESTE-MAYAGUEZ Y VECINDAD-SUROESTE-CULEBRA-VIEQUES- AGUAS COSTERAS Y LEJOS DE LA COSTA DEL ATLANTICO Y DEL CARIBE- 519 PM AST VIERNES 22 DE ABRIL DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES PELIGROSAS DEL TIEMPO ES PARA PUERTO RICO Y LAS AGUAS COSTERAS ADYACENTES DEL ATLANTICO. .DIA UNO...ESTA NOCHE .VIENTOS...VIENTOS SOSTENIDOS CERCA DE 20 MPH SE ESPERAN A TRAVES DE LAS AGUAS DEL ATLANTICO Y DEL MAR CARIBE. .OLAS/OLEAJE...OLEAJE PICADO DE 5 A 7 PIES SE ESPERA A TRAVES DE LAS AGUAS DEL ATLANTICO Y LOS PASAJES DEL CARIBE. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO ALTO DE CORRIENTES SUBMARINAS PARA LAS PLAYAS ORIENTADAS HACIA EL NORTE DE PUERTO RICO...INCLUYENDO A CULEBRA. .DIAS DOS HASTA SIETE...SABADO A JUEVES UN RIESGO ALTO DE CORRIENTES SUBMARINAS ESTARA EN EFECTO PARA EL EXTREMO ESTE DE VIEQUES EL SABADO. UN RIESGO ALTO DE CORRIENTES SUBMARINAS CONTINUARA EN EFECTO A TRAVES DE LAS PLAYAS ORIENTADAS HACIA EL NORTE DE PUERTO RICO Y CULEBRA HASTA EL LUNES. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN. AMZ715-725-VIZ001-002-232130- SAN TOMAS SAN JOHN E ISLAS ADYACENTES-SANTA CRUZ- AGUAS CERCA DE LA COSTA DEL ATLANTICO Y AGUAS COSTERAS ADYACENTES DEL CARIBE- 519 PM AST VIERNES 22 DE ABRIL DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES PELIGROSAS DEL TIEMPO ES PARA LAS ISLAS VIRGENES AMERICANAS Y LAS AGUAS ADYACENTES COSTERAS. .DIA UNO...ESTA NOCHE .VIENTOS...VIENTOS SOSTENIDOS CERCA DE 20 MPH SE ESPERAN A TRAVES DE LAS AGUAS DEL ATLANTICO Y DEL MAR CARIBE. .OLAS/OLEAJE...OLEAJE PICADO DE 5 A 7 PIES SE ESPERA A TRAVES DE LAS AGUAS DEL ATLANTICO Y LOS PASAJES DEL CARIBE. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO ALTO DE CORRIENTES SUBMARINAS PARA LAS PLAYAS ORIENTADAS HACIA EL NORTE DE SAN THOMAS. .DIAS DOS HASTA SIETE...SABADO A JUEVES UN RIESGO ALTO DE CORRIENTES SUBMARINAS CONTINUARA A LO LARGO DE LAS PLAYAS ORIENTADAS HACIA EL NORTE DE SAN THOMAS EL SABADO. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1032 PM AST FRI APR 22 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1020 PM FLOOD SAN JUAN 18.41N 66.06W
04/22/2016 SAN JUAN PR EMERGENCY MNGR
EM REPORTED URBAN FLOODING NEAR CALLE ALEGRIA IN URB LAS
VIRTUDES WITH SIGNIFICANT ACCUMULATION ON A ROAD.
VEHICULES DRIVING THROUGH THIS AREA WERE FORCIN WATER TO
REACH A NEARBY HOUSE. THEY ALSO REPORTED WATER REACHING
HOUSE NEAR CALLE MARTINO IN BARRIO OBRERO. REPORTED BY
JAN ORTIZ.
&&
ICOLONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1120 PM AST FRI APR 22 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1115 PM FLOOD CAROLINA 18.41N 65.98W
04/22/2016 CAROLINA PR EMERGENCY MNGR
EM REPORTED URBAN FLOODING IN FRONT OF THE ROBERTO
CLEMENTE SPORTS COMPLEX ON THE ITURREGUI AVENUE WITH THE
ACUMULATION OF WATER ON THE ROAD.
&&
ICOLONThe San Juan radar (TJUA), 36 km away, was scanning. The volume nearest the first event began at 07:32 UTC.
8 flash flood. Local standard time, as filed.
Several areas in San Juan reported flooded. Houses flooded at Villa Palmeras, sector Playita. Parts of 65th avenue and Baldorioty de Castro flooded.
Several flood reports in San Juan, Cantera, Barrio Obrero and most Santurce with flooded waters affecting houses.
Carretera Conquistador, Veve Calzada in near Casablanca impassable.
Fajardo Gardens, Monte Brisas neighborhood, residences were flooded.
Road 983 impassable.
Road 998 in Barrio Chiquito a mudslide was reported.
At Barrio Sabana, road 983 a mudslide was reported.
Ave. 987, Cano Croabas impassable road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2016Every state in 2016This day in weather historyWarnings in Puerto Rico, April 2016
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: 631856, 631861, 632052, 631867, 632053, 631863, 631864, 631865.