A strong tropical wave that was located near the Windward Passage helped to spread showers across Puerto Rico while a second tropical wave was moving south of the island.
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The episode as NWS SJU wrote it up.
A strong tropical wave that was located near the Windward Passage helped to spread showers across Puerto Rico while a second tropical wave was moving south of the island.
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 23, 2:53 PM AST, 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 253 PM AST WED JUN 23 2010 .SYNOPSIS...AT UPPER LEVELS...LOW PRESSURE CUT OFF ABOUT 580 MILES NORTHEAST OF THE LEEWARD ISLANDS WILL RE-FORM 400 MILES NORTH OF SAINT THOMAS BY SUNDAY BEFORE BEING ABSORBED INTO THE MID-LATITUDE FLOW MID WEEK NEXT WEEK. HIGH PRESSURE GENERALLY STRETCHES ACROSS THE CARIBBEAN AND INTO THE TROPICAL ATLANTIC DURING THE ENTIRE PERIOD. AT MID LEVELS...HIGH PRESSURE EXTENDS EAST SOUTHEAST FROM GEORGIA TO JUST OFF THE AFRICAN CONTINENT AT 20 DEGREES NORTH. A TROUGH EXTENDS NORTH FROM SOUTH AMERICA BETWEEN 50 AND 56 DEGREES WEST. THIS WEAK TROUGHINESS WILL MOVE TO OVER THE U.S. VIRGIN ISLANDS BY THURSDAY NIGHT AND THEN PASS OVER THE LOCAL AREA OVER THE WEEKEND. ANOTHER TROUGH APPROACHES THE AREA DURING THE FIRST DAYS OF JULY. AT LOWER LEVELS...A STRONG TROPICAL WAVE NEAR THE WINDWARD PASSAGE IS SPREADING SHOWERS AND THUNDERSTORMS AND WIDESPREAD CLOUDINESS ACROSS THE CENTRAL CARIBBEAN INCLUDING PUERTO RICO AND THE U.S. VIRGIN ISLANDS IN CONJUNCTION WITH A SECOND TROPICAL WAVE MOVING SOUTH OF PUERTO RICO. A THIRD TROPICAL WAVE IS STRONGLY NEGATIVELY TILTED IN THE TROPICAL ATLANTIC NEAR 47 DEGREES WEST LONGITUDE AND WILL ARRIVE IN THE LOCAL AREA ON SATURDAY. RIDGING ON MONDAY AND TUESDAY WILL BE FOLLOWED BY ANOTHER TROPICAL WAVE WEDNESDAY AND THURSDAY OF NEXT WEEK. && .DISCUSSION...SHOWERS AND THUNDERSTORMS HAVE DRIFTED SLOWLY NORTHWEST INTO THE MONA PASSAGE DURING THE DAY AND BANDS OF SHOWERS MOVED ONSHORE INTO PUERTO RICO MIDDAY MOVING ALONG BRISKLY WITH THE SOUTHEAST LOW LEVEL FLOW. ISOLATED SHOWERS MOVED ACROSS THE U.S. VIRGIN ISLANDS IN MUCH THE SAME DIRECTION LEAVING MINOR AMOUNTS OF RAIN. A BAND OF MUCH HEAVIER SHOWERS DEVELOPED DURING THE AFTERNOON AND IS ALSO EXPECTED TO MOVE THROUGH MUCH OF PUERTO RICO BEFORE 8 PM AST. THE SURFACE LOW PRESSURE MOVING SLOWLY WESTWARD THROUGH THE CENTRAL CARIBBEAN HAS BEEN MAINTAINING THE AREA OF RAIN IN THE MONA CHANNEL WITH A FEW EMBEDDED THUNDERSTORMS. MODELS HAVE NOT HAD GOOD AGREEMENT ON WHETHER TO BRING IN A LOT OR A LITTLE MOISTURE OVERNIGHT THROUGH THURSDAY AND FRIDAY. THE GFS BEGINS DRYING RIGHT AFTER A BAND OF MOISTURE THAT PASSES OVER PUERTO RICO 24/00-06Z...AND ONLY RAMPS UP MOISTURE AGAIN FRIDAY NIGHT AS ANOTHER TROPICAL WAVE...NOW NEAR 46 WEST...APPROACHES THE AREA. THE MOISTURE ACCOMPANYING THIS WAVE LINGERS OVER THE AREA THROUGH THE WEEKEND. CONDITIONS IN THE UPPER LEVELS WILL COME UNDER THE INFLUENCE OF THE UPPER LEVEL LOW THAT WILL BECOME NEARLY NORTH OF THE AREAS OVER THE WEEKEND THAT SHOULD ENHANCE SHOWERS AND THUNDERSTORMS SATURDAY AND SUNDAY. A DRYING TREND THAT HAS BEEN FORECAST BY THE MODELS FOR NEARLY 5 DAYS SHOULD COME ON MONDAY AND WILL LAST UNTIL THE APPROACH OF THE NEXT WAVE CURRENTLY EXPECTED TUESDAY NIGHT THROUGH THURSDAY. THE ECMWF KEEPS A CONNECTION BETWEEN THE MOISTURE STREAMING INTO THE CENTRAL CARIBBEAN LOW AND THE WAVE WHICH APPROACHES THE LOCAL AREA ON SATURDAY...AND THUS IS MUCH WETTER. THE MIMIC PRODUCT SUGGESTS THAT THERE IS AN AREA OF DRIER AIR BETWEEN THE LEEWARD ISLANDS AND THE WAVE TO ARRIVE ON SATURDAY...AND WHILE THIS COULD FILL IN WITH MOISTURE SOMEWHAT...AS HAS HAPPENED SEVERAL TIMES IN THE LAST WEEK...WILL LEAN TOWARD THE GFS SOLUTION. THE NAM IS TRYING TO SPIN THE CENTRAL CARIBBEAN LOW UP AND IS THUS CREATING VIGOROUS BANDS OF SHOWERS IN THE NORTHEAST QUADRANT THAT BRUSH UP AGAINST PUERTO RICO AND BRING MUCH MORE RAIN THAN HAS BEEN SEEN. CURRENTLY WILL LEAN TOWARD OCCASIONAL SHOWERS ON THE WINDWARD SIDE OF PUERTO RICO AND SCATTERED SHOWERS OVER PORTIONS OF THE FORECAST AREA TO THE EAST...BUT WITH LIMITED AMOUNTS OF PRECIPITATION IN A HIGHER THAN CLIMATOLOGY POP SCENARIO WITHOUT MUCH IN THE WAY OF FLOODING...MAINLY DUE TO THE WIDE SPACES BETWEEN THE SHOWERS AND THE 20 TO 25 KNOTS THAT THE SHOWERS ARE MOVING. WINDS SHOULD CONTINUE TO BE A LITTLE GUSTIER THAN USUAL. DUST IN THE TROPICAL ATLANTIC IS STILL VISIBLE IN THE VISIBLE IMAGERY OVER THE TOP OF THE WAVE NEAR 45 WEST AND EXTENDING BACK TO AFRICA...THIS MAY PLAY SOME PART IN THE DRYING TO COME...BUT MAY NOT LIMIT CONVECTION OVER PUERTO RICO MUCH. NEVERTHELESS SOME HAZY SKIES MAY APPEAR BY LATER THURSDAY AND COULD LAST THROUGH THE WEEKEND IN SPITE OF THE PASSING WAVE. && .AVIATION... TEMPO MVFR OR EVEN IFR CONDS IN AND AROUND ALL PR AND THE VI TAF SITES DUE TO SHRA OR POSSIBLE TSRA AS A TROPICAL WAVE PASSES SOUTH OF THE LOCAL AREA. SIMILAR CONDS ARE EXPECTED ACROSS TNCM AND TKPK...BUT SHOULD IMPROVE OVERNIGHT. SOME HAZE MAY ARRIVE BEFORE 24/12Z. && .MARINE...SEAS PEAK AT OR NEAR SMALL CRAFT ADVISORY CONDITIONS EARLY ON THURSDAY...OSTENSIBLY DUE TO THE PASSAGE OF THE TROPICAL WAVE TO OUR SOUTH. THE WAVE THAT FOLLOWS ON THE LAST DAY OF JUNE IS NOT AS VIGOROUS AND MODELS DO NOT EXPECT 7 FOOT SEAS AT THAT TIME IN THE CARIBBEAN OR THE ATLANTIC WATERS. SHOWERS AND SOME THUNDERSTORMS WILL CONTINUE...MAINLY IN THE CARIBBEAN WATERS UNTIL THE MOISTURE DIMINISHES FROM THE CENTRAL CARIBBEAN LOW MENTIONED ABOVE...LATER THURSDAY AND INTO FRIDAY. && .PRELIMINARY POINT TEMPS/POPS... SJU 79 88 79 89 / 50 50 20 20 STT 79 88 80 89 / 60 60 30 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...SCA...AMZ732-741. VI...SCA...AMZ732. && 23/12
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 330 AM AST WED JUN 23 2010 AMZ710>745-PRZ001>013-241000- 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- 330 AM AST WED JUN 23 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT DEEP TROPICAL MOISTURE AND A TROPICAL WAVE THAT IS EXPECTED TO PASS MAINLY TO THE SOUTH OF THE LOCAL ISLANDS TODAY...WILL COMBINE TO BRING SHOWERS AND THUNDERSTORMS ACROSS PUERTO RICO THROUGHOUT THE DAY. DUE TO ALREADY SATURATED SOILS...LOCALIZED FLOODING ALONG WITH THE POTENTIAL FOR MUDSLIDES IN AREAS OF STEEP TERRAIN CAN BE EXPECTED TODAY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE EACH DAY...WITH LOCALIZED FLOODING POSSIBLE EACH AFTERNOON. THE NEXT TROPICAL WAVE...BUILDING NEAR 40 WEST...IS EXPECTED TO REACH THE LOCAL ISLANDS OVER THE UPCOMING WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF FLOODING OR RAINFALL TOTALS IN EXCESS OF TWO INCHES WOULD BE APPRECIATED. AMZ715-725-VIZ001-002-241000- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 330 AM AST WED JUN 23 2010 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 DEEP TROPICAL MOISTURE WILL RESULT IN THE POTENTIAL FOR SCATTERED SHOWERS EACH DAY. THE NEXT TROPICAL WAVE...BUILDING NEAR 40 WEST...IS EXPECTED TO REACH THE LOCAL ISLANDS OVER THE UPCOMING WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. SR
The San Juan radar (TJUA), 38 km away, was scanning. The volume nearest the first event began at 19:18 UTC.
4 flash flood, 1 thunderstorm wind. Local standard time, as filed.
The buoy SJNP4 in the San Juan harbor recorded a 38 knots or 44 mph wind gust. Broadcast media reported a tree downed on a vehicle on Baldorioty Ave at 301 pm. Another gust that reached 31 knots or 36 mph was recorded by this same buoy at 330 pm.
Route 1 from the City of Ponce to Santa Isabel was reported impassable due to the Inabon river in Ponce overflowing its banks.
Las Americas avenue was reported flooded.
Route 3 was flooded between the municipalities of Guayama and Arroyo.
Route 3 was flooded between the municipalities of Guayama and Arroyo.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2010Every state in 2010This day in weather historyWarnings in Puerto Rico, June 2010
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: 247732, 247661, 247663, 247664, 247729.