434  
FNCA72 TJSJ 110825  
FWSSJU  
 
SPOT FORECAST FOR UPR JUANA DIAZ RX...PUERTO RICO FIRE DEPT.  
NATIONAL WEATHER SERVICE SAN JUAN PR  
425 AM AST FRI JAN 11 2019  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 AST ON JANUARY 11.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
QUESTIONS OR CONCERNS ABOUT THIS FORECAST, CONTACT (787) 253-4501.  
   
DISCUSSION
 
ALTHOUGH KBDI VALUES ACROSS THE SOUTH COASTAL PLAINS  
ARE ABOVE 600; LIGHT WINDS AND YESTERDAY'S WETTING RAINS WILL MAINTAIN  
THE FIRE DANGER LOW TODAY. RH VALUES ACROSS THESE AREAS ARE EXPECTED  
TO RANGE IN THE UPPER 50S TO LOW 60S WITH 10-HOUR FUEL MOISTURE VALUES  
NEAR 12 PERCENT.  
 
LATEST KBDI VALUES: CABO ROJO 643, GUANICA 679 AND CAMP SANTIAGO 705.  
 
MOISTURE ADVECTION TO CONTINUE, PARTICULARLY WITH THE ONSET OF THE SEA  
BREEZE, THEREFORE ISOLATED PASSING SHOWERS WILL REMAIN POSSIBLE TODAY.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT).  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 85.  
MIN HUMIDITY........UPPER 50S.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHEAST WINDS AROUND 5 MPH SHIFTING TO THE  
SOUTHEAST 6 TO 9 MPH IN THE LATE MORNING AND  
AFTERNOON.  
MIXING HEIGHT.......400-2200 FT AGL INCREASING TO 3800-5500 FT AGL  
IN THE LATE MORNING AND AFTERNOON.  
TRANSPORT WINDS.....SOUTHEAST 2 TO 6 MPH.  
DISPERSION..........4.  
 
TIME (AST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........53 53 53 53 53 53 35 35 35 35 35 35  
WEATHER COV.....ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........  
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............65 68 71 75 80 83 85 85 83 80 77 75  
RH..............95 92 88 82 75 68 62 58 58 61 66 73  
20 FT WIND DIR..N NE NE NE E SE SE SE S SE SE SE  
20 FT WIND SPD..5 5 4 5 6 6 6 7 8 7 6 6  
20 FT WIND GUST.6 6 5 6 7 7 8 10 8 7  
MIX HGT (KFT)...0.4 0.4 0.9 2.2 3.8 5.0 5.5 5.4 5.1 4.9 4.4 3.8  
TRANSP WIND DIR.NE NE NE E SE SE SE SE SE SE SE SE  
TRANSP WIND SPD.2 3 3 5 5 6 6 6 6 5 5 3  
DISPERSION......2 3 6 6 6 6 6 6 6 6 6 6  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 67.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHEAST WINDS 5 TO 8 MPH.  
MIXING HEIGHT.......1400-2700 FT AGL DECREASING TO 300-600 FT AGL  
EARLY IN THE EVENING.  
TRANSPORT WINDS.....NORTHEAST 2 TO 6 MPH.  
DISPERSION..........3.  
 
TIME (AST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........10 10 10 10 10 10 3 3 3 3 3 3  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............74 73 72 71 70 70 69 69 68 68 67 67  
RH..............80 88 93 97 99 99 99 98 98 99 100 100  
20 FT WIND DIR..E NE NE NE NE N N N N N NE NE  
20 FT WIND SPD..6 5 5 5 6 6 6 6 6 7 7 7  
20 FT WIND GUST. 6 6 6 7 7 7 8 8 8  
MIX HGT (KFT)...2.7 1.4 0.5 0.3 0.4 0.6 0.6 0.6 0.6 0.5 0.5 0.5  
TRANSP WIND DIR.SE E E E NE NE NE NE NE NE NE NE  
TRANSP WIND SPD.2 2 2 2 3 3 3 5 5 5 6 6  
DISPERSION......1 1 1 1 2 2 2 3 3 3 4 4  
   
SATURDAY
 
 
SKY/WEATHER.........SUNNY (10-20 PERCENT).  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 85.  
MIN HUMIDITY........48 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......EAST WINDS 7 TO 10 MPH.  
MIXING HEIGHT.......400-1900 FT AGL INCREASING TO 4600-6200 FT AGL.  
TRANSPORT WINDS.....EAST 6 TO 12 MPH.  
DISPERSION..........6.  
 
TIME (AST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........1 1 1 1 1 1 31 31 31 31 31 31  
WEATHER COV..... ISO ISO ISO ISO ISO ISO  
WEATHER TYPE.... RW RW RW RW RW RW  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............67 70 73 77 80 82 84 85 85 83 80 77  
RH..............99 97 92 84 74 65 56 50 48 50 57 65  
20 FT WIND DIR..NE NE NE E E SE E E E E E E  
20 FT WIND SPD..7 6 6 7 7 8 8 9 9 10 10 10  
20 FT WIND GUST.8 7 7 8 8 10 10 10 10 11 11 11  
MIX HGT (KFT)...0.4 0.4 0.8 1.9 3.3 4.5 5.4 6.0 6.2 6.0 5.5 4.6  
TRANSP WIND DIR.NE NE NE NE E E E E E E E E  
TRANSP WIND SPD.6 6 6 8 10 12 12 12 10 10 10 10  
DISPERSION......5 5 6 6 6 6 6 6 6 6 6 6  
 

 
FORECASTER...SANCHEZ/MARTINEZ  
REQUESTED BY...JOS M. MARTNEZ  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1900190.0/SJU  
.DELDT 01/11/19  
.EMAIL FIREJUMBO76@HOTMAIL.COM  
 
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