A low level perturbation across the northern Leeward Islands brought increasing amounts of moisture to Puerto Rico and allowed for heavy showers and thunderstorms to develop from Mayaguez towards the central interior part of the island. Rainfall estimates of around three inches fell.
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The episode as NWS SJU wrote it up.
A low level perturbation across the northern Leeward Islands brought increasing amounts of moisture to Puerto Rico and allowed for heavy showers and thunderstorms to develop from Mayaguez towards the central interior part of the island. Rainfall estimates of around three inches fell.
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 Jun 3, 3:11 PM AST, 23 hours 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 311 PM AST WED JUN 3 2009 .SYNOPSIS...SEVERAL MID-UPPER LEVEL TROFS ONE WITH AXIS ALONG 60W AND ANOTHER ONE ALONG 70W EXTENDING SOUTH FROM AN UPPER LOW NEAR 31N AND 70W WILL MOVE EAST NEXT 48 HRS WITH THE LATTER PUSHING EAST OF 60W BY FRI AFTERNOON. MID-UPPER LVL RIDGING TO BUILD JUST W OF THE AREA DURING THE SECOND HALF OF THE WEEKEND AND INTO NEXT WEEK. && .DISCUSSION...WET PATTERN IN STORE FOR THE NEXT 24 HRS AS MID TO UPPER LVL TROFS INTERACT WITH A VERY MOIST AIR MASS ACROSS THE REGION. MICROWAVE IMAGERY SHOWS A PLUME OF 2.0+ PW AIR THAT EXTENDS FROM THE ERN TIP OF THE DOMINICAN REPUBLIC EAST THROUGH PR AND THE LEEWARDS AND INTO THE ATLC EAST OF 55W. BY FRI AFTERNOON...OP GFS AND GFES SHOW TROF AXIS ALONG 70W MOVING EAST OF 60W WITH MID-LVL HIGH PRES OVR THE AREA AND UPPER LVL RIDGING TRYING TO BUILD INTO THE AREA FROM THE WEST. THIS WOULD NORMALLY TEND TO SUPPRESS CONVECTION...HOWEVER GFS INDICATES AIR MASS WILL REMAIN QUITE MOIST WITH PWATS AROUND 2.0 INCHES THROUGH SAT. SO WITH STRONG HEATING THIS TIME OF THE YEAR AS WE APPROACH THE SUMMER SOLSTICE SCT AFTERNOON CONVECTION MAY STILL REMAIN POSSIBLE EACH DAY BUT WITH LESS CVRG EXPECTED THAN TODAY AND TOMORROW. HIGHLY AMPLIFIED TROPICAL WAVE ALONG 37 PER LATEST TPW AND IR IMAGERY WILL MOVE WEST AND ENTER THE ERN CARIBBEAN SEA ON TUE BASED ON LATEST 12Z GFS AND USING THE CLIMATOLOGICAL RATE OF 5 DEGS LONGITUDE PER DAY. VERTICAL SHEAR TOO STRONG FOR ANY TC DEVELOPMENT AND MID-UPPER LVL RIDGING EXPECTED TO BUILD OVER THE AREA NOT ALL THAT CONDUCIVE TO A LOT OF WEATHER. && .AVIATION...TEMPO MVFR CONDITIONS LIKELY AT ALL SITES...WITH A VCTS GOING ON MOST AIRPORTS...WITH TSRA TEMPO IFR VIS AT TJSJ AN TJBQ UNTIL ABOUT 21Z. AFTERWARD SHOULD GO VFR...WITH SOME PASSING MVFR SHOWERS AFTER 04Z && .MARINE...TRANQUIL MARINE CONDITIONS WITH WINDS 15 KT OR LESS AND WAVES 3 TO 5 FT BUT LOCALLY HIGHER WINDS/WAVES POSSIBLE IN THE VICINITY OF STRONGER TSTMS. && .PRELIMINARY POINT TEMPS/POPS... SJU 76 83 76 87 / 60 60 30 40 STT 78 81 76 86 / 60 60 20 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 93/64
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Highway 2 was reported flooded in front of Mayaguez Terrace Walgreens, northbound from Mayaguez to Anasco.
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, June 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: 184270.