349  
FXCA62 TJSJ 240800  
AFDSJU  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN JUAN PR  
ISSUED BY NATIONAL WEATHER SERVICE MIAMI FL  
400 AM AST SUN SEP 24 2017  
 
SHORT TERM...DEEP TROPICAL MOISTURE COUPLED WITH A SOUTH TO  
SOUTHEAST FLOW WILL KEEP PRECIPITABLE WATER VALUES WELL OVER 2  
INCHES THROUGH THE WEEKEND. HOWEVER, THE AIR MASS IS RELATIVELY  
STABLE AT THIS TIME AS A WEAK WAVE HAS MOVED WEST TO HISPANOLA.  
SHOWER ACTIVITY WILL BE ISOLATED THROUGH SUNDAY, EXCEPT POSSIBLY  
EAST OF THE VIRGIN ISLANDS, WHICH MAY BE AFFECTED BY A WEAK  
INCOMING EASTERLY WAVE BY SUNDAY EVENING. THIS SYSTEM MAY BRING  
AS MUCH AS AN INCH OF RAIN IN ISOLATED LOCATIONS TO THE VIRGIN  
ISLANDS SUNDAY NIGHT AND PUERTO RICO MONDAY, BUT MOST AREAS WILL  
SEE QUITE A BIT LESS THAN THAT.  
 
COMMUNICATIONS ARE IMPROVING AND SOME WEATHER REPORTS ARE COMING  
IN. IT IS STILL DIFFICULT TO ASCERTAIN CONDITIONS IN THE AREA  
THOUGH. HOWEVER, SOME GAUGES CONTINUE TO REPORT. THERE IS ONLY  
ONE GAGE STILL SHOWING FLOOD CONDITIONS AND THAT ONE IS ON THE  
WEST END OF PUERTO RICO.  
 
HEAT INDEX VALUES WILL BE NEAR 100 FOR THE NEXT FEW DAYS, BRINGING  
HOT AND STICKY WEATHER TO THE AREA. THIS WILL MAKE RECOVERY  
EFFORTS DIFFICULT AND OVERALL LIVING UNPLEASANT AS ELECTRICITY  
REMAINS OUT ACROSS THE ISLAND.  
 
LONG TERM...THE PATTERN WILL CHANGE TUESDAY INTO TUESDAY NIGHT.  
FLOW WILL BECOME EASTERLY AND PRECIPITABLE WATER VALUES WILL DROP  
TO AROUND 1.75 INCHES. THIS WILL BRING MORE SEASONABLE WINDS AND  
RELATIVELY DRIER CONDITIONS TO THE FORECAST AREA.  
 

 
   
AVIATION
 
VFR CONDITIONS WILL PREVAIL THROUGH SUNDAY EVENING,  
WITH ISOLATED MVFR CIGS/VSBYS IN ISOLATED TO SCATTERED SHOWERS.  
 

 
   
MARINE
 
SOUTHEAST WINDS WILL CONTINUE THROUGH MONDAY NIGHT.  
SHOWER ACTIVITY WILL BE ISOLATED TO SCATTERED TODAY, BUT  
INCREASING SHOWERS AND THUNDERSTORMS WILL MOVE IN FROM THE EAST  
SUNDAY NIGHT INTO MONDAY. MORE SEASONABLE EASTERLY WINDS WILL  
RETURN TUESDAY.  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SJU 87 79 87 79 / 20 20 30 60  
STT 84 82 84 83 / 20 60 40 50  
 

 
   
SJU WATCHES/WARNINGS/ADVISORIES
 
 
PR...NONE.  
VI...NONE.  
AM...NONE.  
 

 
 

 
 
SHORT TERM...99  
LONG TERM....99  
 
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