551  
FNCA72 TJSJ 201638  
FWSSJU  
 
SPOT FORECAST FOR VNWR...USFWS  
NATIONAL WEATHER SERVICE SAN JUAN PR  
1238 PM AST WED MAR 20 2019  
 
FORECAST IS BASED ON FORECAST START TIME OF 1400 AST ON MARCH 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
QUESTIONS OR CONCERNS ABOUT THIS FORECAST, CONTACT (787) 253-4501.  
   
DISCUSSION
 
RECENT KBDI AND 10-HOUR FUEL MOISTURE SHOW VALUES  
AROUND 460 AND 9 PERCENT IN VIEQUES, RESPECTIVELY. A PATCH OF  
LOW-LEVEL MOISTURE WILL CONTINUE TO MOVE ACROSS THE REGION TODAY,  
ENHANCING CLOUD COVERAGE AND SHOWER DEVELOPMENT PARTICULARLY  
DOWNWIND FROM THE ISLAND. THAT SAID, STREAM-LIKE CLOUDS AND  
SHOWERS ORIGINATING FROM SAINT CROIX MAY AFFECT THIS AREA UNDER  
A SOUTHEAST WIND FLOW RANGING BETWEEN 10-15 MPH WITH HIGHER GUSTS.  
IN COMPARISON WITH THE NEAREST FIRE WEATHER STATION CRITERIA, A  
LOW FIRE WEATHER DANGER IS EXPECTED DURING THE REQUESTED PERIOD.  
NEVERTHELESS, SIGNIFICANT WETTING RAINS ARE NOT EXPECTED AT THIS  
TIME.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT). SCATTERED  
SHOWERS.  
CHANCE OF PCPN......40 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 83.  
MIN HUMIDITY........76 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......SOUTHEAST WINDS 12 TO 13 MPH.  
MIXING HEIGHT.......2600-3100 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 14 TO 15 MPH.  
SMOKE DISPERSAL.....GOOD (33600 KNOT-FT).  
DISPERSION..........6.  
 
TIME (AST) 2PM 3PM 4PM 5PM  
SKY (%).........50 50 50 50  
WEATHER COV.....SCT SCT SCT SCT  
WEATHER TYPE....RW RW RW RW  
TSTM COV........  
CHC OF PCPN (%).40 40 40 40  
LAL.............1 1 1 1  
TEMP............83 83 82 80  
RH..............76 77 80 83  
20 FT WIND DIR..E E SE SE  
20 FT WIND SPD..11 11 10 10  
20 FT WIND GUST.12 12 11 11  
MIX HGT (KFT)...2.6 2.7 2.9 3.1  
MIXNG WIND DIR..E E SE SE  
MIXNG WIND SPD..15 15 14 14  
DISPERSION......6 6 6 6  
VRATE KT-FT/100034 35 35 37  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT). ISOLATED  
SHOWERS.  
CHANCE OF PCPN......20 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 74.  
MAX HUMIDITY........90 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......EAST WINDS 10 TO 12 MPH.  
MIXING HEIGHT.......2500-3100 FT AGL.  
TRANSPORT WINDS.....EAST 13 TO 14 MPH.  
SMOKE DISPERSAL.....FAIR TO GOOD (27900-37600 KNOT-FT).  
DISPERSION..........6.  
 
TIME (AST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........30 30 30 30 30 30 30 30 30 30 30 30  
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 (%).20 20 20 20 20 20 20 20 20 20 20 20  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............79 78 77 77 76 76 75 75 74 74 74 74  
RH..............84 83 82 83 82 82 83 83 83 84 81 81  
20 FT WIND DIR..SE E E E E E E E E E E E  
20 FT WIND SPD..10 10 11 11 10 10 10 10 10 9 9 9  
20 FT WIND GUST.11 11 12 12 11 11 11 11 11 10 10 10  
MIX HGT (KFT)...3.1 3.1 3.0 2.9 2.7 2.6 2.6 2.6 2.6 2.6 2.5 2.5  
MIXNG WIND DIR..SE SE SE SE E E E E E E E E  
MIXNG WIND SPD..14 13 13 13 14 14 14 14 14 14 13 13  
DISPERSION......6 6 6 6 6 6 6 6 6 6 6 6  
VRATE KT-FT/100038 34 33 32 33 32 31 31 31 31 28 28  
   
THURSDAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT). ISOLATED SHOWERS.  
CHANCE OF PCPN......20 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 83.  
MIN HUMIDITY........74 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......EAST WINDS 8 TO 10 MPH.  
MIXING HEIGHT.......1900-2800 FT AGL.  
TRANSPORT WINDS.....EAST 9 TO 13 MPH.  
SMOKE DISPERSAL.....FAIR (17700 KNOT-FT).  
DISPERSION..........6.  
 
TIME (AST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........30 30 30 30 30 30 20 20 20 20 20 20  
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 (%).20 20 20 20 20 20 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............75 77 78 80 81 82 82 83 83 83 82 80  
RH..............80 77 74 74 74 73 72 74 75 75 75 78  
20 FT WIND DIR..E E E E E E E E E E E E  
20 FT WIND SPD..9 9 10 9 9 8 8 8 7 7 8 8  
20 FT WIND GUST.10 10 11 10 10 10 10 10 8 8 10 10  
MIX HGT (KFT)...2.5 2.5 2.5 2.3 2.0 1.9 2.0 2.2 2.4 2.6 2.7 2.8  
MIXNG WIND DIR..E E E E E E E E SE E E E  
MIXNG WIND SPD..13 13 13 13 12 12 10 9 9 9 10 10  
DISPERSION......6 6 6 6 6 6 6 6 6 6 6 6  
VRATE KT-FT/100028 28 27 25 20 19 18 18 20 21 25 25  
 

 
 
FORECASTER...IAN COLON-PAGAN/EMANUEL RODRIGUEZ-GONZALEZ  
REQUESTED BY...MARTIN RAMOS ICT5,SINGLE RESOURCE  
TYPE OF REQUEST...WILDFIRE  
.TAG 1903958.0/SJU  
.DELDT 03/20/19  
.EMAIL MARTIN_RAMOS@FWS.GOV  
 
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