Post by Deleted on Jul 2, 2013 13:15:17 GMT -6
It looks like the 4th of July weekend will be with variable weather between sun and some scattered showers.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
248 PM AST TUE JUL 2 2013
.DISCUSSION...EARLY AFTERNOON SHOWERS HAVE SLOWLY DECREASED...HOWEVER
SCATTERED SHOWERS FROM THE NORTHEAST WILL CONTINUE TO ENTER THE
LOCAL AREA FOR THE REST OF THE DAY. THE 700 MB ANALYSIS
DEPICTS A WEAK TROUGH CURRENTLY LOCATED WEST OF THE REGION. THIS
WILL ALLOW WINDS TO REMAIN MAINLY FROM THE NORTHEAST...SCATTERED
SHOWERS TO CONTINUE TO MOVE ONSHORE OVER PR MAINLY ACROSS THE
NORTH AND EAST COASTS...AND WITH THE DIURNAL HEATING AND
GEOGRAPHIC EFFECTS...POSSIBLY ENHANCE CONVECTION ACROSS THE
WESTERN AREA OF PR LATER IN THE AFTERNOON. ALTHOUGH THE GFS REL
HUM IS SOMEWHAT SHALLOW...THE PRECIP WATER ON THE 12 Z SOUNDING
REMAINS HIGH AT AROUND 2 IN AND RELATIVELY MOIST SURFACE
CONDITIONS.
THE GFS INDICATES ANOTHER TROPICAL WAVE ENTERING THE LOCAL REGION
BY WEDNESDAY AND THURSDAY. RELATIVE HUMIDITY IS LIMITED DURING
ITS PASSAGE...INDICATING SUGGESTING GOOD PRECIPITATION...BUT
LIMITED EXPECTATION FOR FLOODING. WINDS WILL SHIFT FROM THE
NORTHEAST TO MAINLY EAST ON WEDNESDAY AND THEN SOUTHEAST ON
THURSDAY. THE GFS SHOWS A WEAK TROUGH CROSSING THROUGH THE REGION
SAT NIGHT THROUGH SUN BRINGING IN MORE MOISTURE INTO THE AREA.
WITH A DEEPER MOISTURE AN INCREASE IN SHOWER AND THUNDERSTORM
ACTIVITY IS POSSIBLE ACROSS THE LOCAL AREA.
&&
.AVIATION...HEAVY SHOWERS WERE MOVING RAPIDLY ACROSS THE AREA BUT
BROUGHT MVFR CONDITIONS DUE TO BOTH VSBYS AND CIGS. ALSO SOME
MOUNTAIN OBSCURATIONS WERE OCCURRING. EXPECT CONDS TO IMPROVE IN
THE WEST HALF OF PUERTO RICO AND GENERALLY REMAIN VFR IN THE USVI
AND LEEWARD ISLANDS. CONDS WILL DETERIORATE AFT 03/12Z AS NEXT
TROPICAL WAVE APPROACHES THE LEEWARD ISLANDS. AFT 03/16Z SHRA AND
TSTMS WILL DEVELOP OVER INTERIOR PUERTO RICO WITH LCL MVFR AND
AREAS OF MTN OBSCURATIONS. LLVL WINDS E 10 TO 20 KTS EXCEPT NEAR
25 KT BTWN 4-8 KFT. THE TROP WAVE WILL ARRIVE AFT 03/22Z IN PR AND
THE USVI.
&&
.MARINE...WINDS REMAIN BETWEEN 10 TO 20 KT AND SEAS LESS THAN 6
FT FOR THE ATLANTIC COASTAL WATERS DURING THE NEXT FEW DAYS. AT
THIS TIME SEAS ARE EXPECTED TO REMAIN BELOW 7 FEET...BUT
CONDITIONS WILL BE WATCHED FOR AN INCREASE DUE TO THE APPROACHING
TROPICAL WAVES.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 76 86 78 87 / 60 20 60 60
STT 77 90 79 89 / 50 30 60 60
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
248 PM AST TUE JUL 2 2013
.DISCUSSION...EARLY AFTERNOON SHOWERS HAVE SLOWLY DECREASED...HOWEVER
SCATTERED SHOWERS FROM THE NORTHEAST WILL CONTINUE TO ENTER THE
LOCAL AREA FOR THE REST OF THE DAY. THE 700 MB ANALYSIS
DEPICTS A WEAK TROUGH CURRENTLY LOCATED WEST OF THE REGION. THIS
WILL ALLOW WINDS TO REMAIN MAINLY FROM THE NORTHEAST...SCATTERED
SHOWERS TO CONTINUE TO MOVE ONSHORE OVER PR MAINLY ACROSS THE
NORTH AND EAST COASTS...AND WITH THE DIURNAL HEATING AND
GEOGRAPHIC EFFECTS...POSSIBLY ENHANCE CONVECTION ACROSS THE
WESTERN AREA OF PR LATER IN THE AFTERNOON. ALTHOUGH THE GFS REL
HUM IS SOMEWHAT SHALLOW...THE PRECIP WATER ON THE 12 Z SOUNDING
REMAINS HIGH AT AROUND 2 IN AND RELATIVELY MOIST SURFACE
CONDITIONS.
THE GFS INDICATES ANOTHER TROPICAL WAVE ENTERING THE LOCAL REGION
BY WEDNESDAY AND THURSDAY. RELATIVE HUMIDITY IS LIMITED DURING
ITS PASSAGE...INDICATING SUGGESTING GOOD PRECIPITATION...BUT
LIMITED EXPECTATION FOR FLOODING. WINDS WILL SHIFT FROM THE
NORTHEAST TO MAINLY EAST ON WEDNESDAY AND THEN SOUTHEAST ON
THURSDAY. THE GFS SHOWS A WEAK TROUGH CROSSING THROUGH THE REGION
SAT NIGHT THROUGH SUN BRINGING IN MORE MOISTURE INTO THE AREA.
WITH A DEEPER MOISTURE AN INCREASE IN SHOWER AND THUNDERSTORM
ACTIVITY IS POSSIBLE ACROSS THE LOCAL AREA.
&&
.AVIATION...HEAVY SHOWERS WERE MOVING RAPIDLY ACROSS THE AREA BUT
BROUGHT MVFR CONDITIONS DUE TO BOTH VSBYS AND CIGS. ALSO SOME
MOUNTAIN OBSCURATIONS WERE OCCURRING. EXPECT CONDS TO IMPROVE IN
THE WEST HALF OF PUERTO RICO AND GENERALLY REMAIN VFR IN THE USVI
AND LEEWARD ISLANDS. CONDS WILL DETERIORATE AFT 03/12Z AS NEXT
TROPICAL WAVE APPROACHES THE LEEWARD ISLANDS. AFT 03/16Z SHRA AND
TSTMS WILL DEVELOP OVER INTERIOR PUERTO RICO WITH LCL MVFR AND
AREAS OF MTN OBSCURATIONS. LLVL WINDS E 10 TO 20 KTS EXCEPT NEAR
25 KT BTWN 4-8 KFT. THE TROP WAVE WILL ARRIVE AFT 03/22Z IN PR AND
THE USVI.
&&
.MARINE...WINDS REMAIN BETWEEN 10 TO 20 KT AND SEAS LESS THAN 6
FT FOR THE ATLANTIC COASTAL WATERS DURING THE NEXT FEW DAYS. AT
THIS TIME SEAS ARE EXPECTED TO REMAIN BELOW 7 FEET...BUT
CONDITIONS WILL BE WATCHED FOR AN INCREASE DUE TO THE APPROACHING
TROPICAL WAVES.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 76 86 78 87 / 60 20 60 60
STT 77 90 79 89 / 50 30 60 60