Tropicsweatherpr's WunderBlog

August Daily Weather in Puerto Rico

By: Tropicsweatherpr, 10:15 AM GMT on August 01, 2013

Good morning. Scattered showers will move thru PR today as a weak through swings westward.Hazy conditions will be present for the weekend.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
450 AM AST THU AUG 1 2013

.SYNOPSIS...AT UPPER LEVELS...THE TUTT TO THE NORTHEAST OF THE
AREA WILL EXTEND TOWARD THE AREA OVER THE WEEKEND AND EDGE TO THE
NORTHWEST BRINGING IN SOUTHWEST WINDS OVER THE LOCAL AREA MONDAY
AND TUESDAY. ALTHOUGH THE TROUGH WILL BREAK OVER THE LOCAL AREA
MID WEEK...IT RETURNS JUST NORTH OF THE FORECAST AREA OVER THE
FOLLOWING WEEKEND.

AT MID LEVELS...A WEAK TROUGH WILL MOVE OVER THE LOCAL AREA WHILE
DISSIPATING TODAY. HIGH PRESSURE IN THE CENTRAL ATLANTIC WILL
STRETCH OUT BETWEEN 20 AND 32 DEGREES NORTH BY SUNDAY AND
CONTINUE FOR MOST OF THE FOLLOWING WEEK. LIMITED MOISTURE WILL
CONTINUE AT MID LEVELS WITH THE BEST MOISTURE BEING FOUND TODAY
AND NOT AGAIN UNTIL FRIDAY OF NEXT WEEK.
AT LOWER LEVELS...HIGH PRESSURE CONTINUES OVER THE NORTHEAST
CENTRAL ATLANTIC WITH A RIDGE EXTENDING WEST SOUTHWEST TO FLORIDA
DURING THE ENTIRE PERIOD. THIS WILL MAINTAIN EASTERLY TRADE WIND
FLOW THROUGH THE PERIOD. A WEAK TROUGH WILL PASS THROUGH
TODAY...FOLLOWED BY A WIND SURGE CARRYING COPIOUS SAHARAN DUST
FRIDAY AND SATURDAY...TAPERING OFF ON SUNDAY. WINDS WILL BECOME
EAST NORTHEAST EARLY IN THE WEEK AS MID LEVEL HIGH PRESSURE MOVES
INTO THE BAHAMA ISLANDS. SOME MOISTURE IS BEING CARRIED IN THIS
AIR DESPITE THE DUST CONTENT. THE NEXT DISTURBANCE IS EXPECTED MID
WEEK NEXT WEEK.

&&

.DISCUSSION...SHOWERS...SOME HEAVY MOVED ACROSS NORTHEAST AND
SOUTHEAST PUERTO RICO EARLY THIS MORNING...LEAVING UP TO 1 INCH OF
RAIN IN A FEW PLACES IN THE LUQUILLO RANGE. SAN JUAN HAD ONE TENTH
INCH AT THE AIRPORT. THE SHOWERS HAVE BEEN MADE POSSIBLE BY A BAND
OF MOISTURE NOW MOVING WEST OVER THE LOCAL AREA. THIS BAND IS
EXPECTED TO CONTINUE OVER THE LOCAL AREA TODAY AND TONIGHT...WITH
SHOWERS TAPERING OFF OVERNIGHT TONIGHT. AN AREA OF DUST IS WELL
DEFINED IN SATELLITE IMAGES WITH THE DIFFUSE FORWARD BOUNDARY
BETWEEN 50 AND 55 DEGREES WEST LONGITUDE. AT ITS CURRENT SPEED THE
FIRST VESTIGES OF DUST WILL BE ARRIVING MID DAY ON FRIDAY. THE
DUST IS PUNCHING WEST ON THE STRENGTH OF THE TRADE WIND FLOW.
ORIGINALLY THE DUST MOVED OFF OF THE SAHARA ON MONDAY AND WAS
SUFFICIENTLY DENSE TO COLOR THE WATER BROWN EVEN AT MIDDAY IN THE
PSEUDO COLOR IMAGES. AS IT REACHED THE CAPE VERDE ISLANDS CLEAN
FLOW FROM HIGH PRESSURE OFF THE AFRICAN COAST CIRCULATED INTO THIS
FLOW CREATING WEAKER CONCENTRATIONS BETWEEN 15 AND 20 DEGREES
NORTH WHICH HAPPENS TO BE AT OUR LATITUDE. HENCE THE FAIRLY THICK
DUST WE WILL SEE FRIDAY NIGHT AND SATURDAY WILL NOT BE THE BEST
THIS AREA HAD TO DELIVER. THE GFS ALSO INDICATES THAT THERE WILL
BE SOME MOISTURE WITH THIS LAYER...MAINLY AT LOWER LEVELS...HAVING
BEEN PICKED UP DURING ITS LONG JOURNEY ACROSS THE ATLANTIC. THIS
WILL ALLOW SHOWERS AND THUNDERSTORMS TO BE GENERATED OVER THE
AREA THROUGH THE ENTIRE EPISODE...THOUGH MAINLY DURING THE
AFTERNOONS IN THE INTERIOR OF PUERTO RICO. OTHERWISE ONLY A FEW
SHOWERS WILL BE SEEN. AS HAS BEEN SEEN WITH PREVIOUS DUST EPISODES
FREQUENT LIGHTNING IS EXPECTED WHERE THUNDERSTORMS ARE GENERATED.
SHOWERS WILL TAPER OFF EARLY IN THE WEEK UNTIL THE NEXT WAVE
ARRIVES. THIS WILL COME SOMEWHAT DIVIDED TUESDAY NIGHT AND
WEDNESDAY AND IS NOT EXPECTED TO BE A MAJOR EVENT. ALSO AT THIS
TIME THE MODELS ARE NOT DEPICTING ANY CYCLONES TO DEVELOP FOR US
IN THE FLOW OUT OF THE AFRICAN CONTINENT THROUGH THE FIRST DOZEN
DAYS OF AUGUST.

FRIDAY WILL ALSO SEE SOME WARMING DUE TO A SHIFT TO THE EAST
SOUTHEAST OF THE WIND FLOW AND THE DEPARTURE OF THE SHOWER BEARING
MOISTURE BAND NOW MOVING THROUGH. TEMPERATURES ALONG MOST COASTS
WILL REACH THE 90S FRIDAY. WINDS WILL BE LIGHTER AND MORE
NORTHEASTERLY COME MONDAY.

&&

.AVIATION...
VFR CONDS EXPECTED THROUGH THE MORNING HOURS ACROSS THE
LOCAL TAF SITES. TSTMS POSSIBLE AT TJBQ AND TJMZ THIS AFTERNOON.
FRIDAY... CONDITIONS IMPROVING MARKEDLY HOWEVER A DENSE LAYER OF
SAHARAN DUST IS EXPECTED TO ARRIVE FRI NIGHT LOWERING THE VSBYS.
LLVL WINDS EAST TO SOUTHEAST 10 TO 20 KT.

&&

.MARINE...GENERALLY STEADY TRADE WIND FLOW WILL MAINTAIN SEAS OF 5
FEET OR LESS THROUGHOUT THE NEXT 7 DAYS...EXCEPT POSSIBLY 6 FEET
IN THE CARIBBEAN FRIDAY AND SATURDAY. WIND FLOW WILL INCREASE TODAY
THROUGH FRIDAY NIGHT WITH POCKETS OF 20 KNOTS LIKELY AROUND
NORTHWEST PUERTO RICO. MARINERS WILL SEE REDUCED VISIBILITIES THAT
MAY MAKE NAVIGATION BASED ON VISUAL SITING OF OBJECTS MORE THAN 7
MILES AWAY DIFFICULT TO IMPOSSIBLE.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 88 78 90 80 / 70 50 30 10
STT 88 79 90 81 / 70 50 40 20

Daily Weather

Permalink

About Tropicsweatherpr

I am a tropical weather enthusiastic as I live on hurricane alley.

Local Weather

Scattered Clouds
84 °F
Scattered Clouds

Tropicsweatherpr's Recent Photos

Hurricane Gilbert