943  
FNCA52 TJSJ 250831  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
431 AM AST THU MAY 25 2017  
   
DISCUSSION
 
A GENERAL DRYING TREND IS FORECAST TO CONTINUE FOR  
THE NEXT COUPLE OF DAYS AS A MASS OF SAHARAN DUST REMAIN ACROSS  
THE LOCAL AREA. RH WILL BRIEFLY REACH 40-50 PERCENT AND WINDS  
AROUND 15-20 MPH CAN BE EXPECTED AT TIMES. HOWEVER, THE LIMITING  
FACTOR WILL CONTINUE TO BE THE CONDITION OF THE FUELS. AT THIS  
TIME, MOST OF THE FUELS REMAIN GREEN DUE TO THE RAINS OF LATE  
APRIL AND EARLY MAY. AS A RESULT...FIRE DANGER THREAT IS EXPECTED  
TO REMAIN MODERATE TODAY AND DURING THE UPCOMING WEEKEND.  
 
PRZ014-260845-  
SOUTHEAST COASTAL PLAINS-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 93 (+2) 75 (0) 93  
RH % (24H TREND) 39 (-11) 82 (-3) 41  
20FTWND-VAL/AM(MPH) E 11 E 10  
20FTWND-RDG/PM(MPH) SE 13 E 8 SE 13  
MIXING HGT(FT-AGL/MSL)6682 6939  
TRANSPORT WND (MPH) E 13 E 14  
VENT RATE (KT-FT) 72864 87659  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 4 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-260845-  
SOUTHERN HILLS-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 91 (+4) 71 (-1) 88  
RH % (24H TREND) 43 (-11) 87 (-4) 48  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 11 E 7 E 10  
MIXING HGT(FT-AGL/MSL)6799 6841  
TRANSPORT WND (MPH) E 12 E 12  
VENT RATE (KT-FT) 66670 76271  
DISPERSION 5 5  
DSI 5 3 5  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-260845-  
NORTH COASTAL PLAINS-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 91 (-1) 77 (+1) 89  
RH % (24H TREND) 46 (-6) 82 (-3) 51  
20FTWND-VAL/AM(MPH) E 11 E 10  
20FTWND-RDG/PM(MPH) E 14 E 10 NE 13  
MIXING HGT(FT-AGL/MSL)5407 6021  
TRANSPORT WND (MPH) E 14 E 14  
VENT RATE (KT-FT) 64884 72252  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 5 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-260845-  
NORTHERN HILLS-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 91 (-1) 75 (+1) 89  
RH % (24H TREND) 45 (-2) 81 (-4) 50  
20FTWND-VAL/AM(MPH) E 9 E 9  
20FTWND-RDG/PM(MPH) NE 12 E 8 E 10  
MIXING HGT(FT-AGL/MSL)6884 6616  
TRANSPORT WND (MPH) E 10 E 13  
VENT RATE (KT-FT) 68370 70440  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 4 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-260845-  
WEST COAST-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 93 (+3) 75 (-1) 85  
RH % (24H TREND) 47 (-4) 79 (-3) 54  
20FTWND-VAL/AM(MPH) E 9 E 9  
20FTWND-RDG/PM(MPH) SE 9 E 6 E 7  
MIXING HGT(FT-AGL/MSL)6838 6950  
TRANSPORT WND (MPH) E 7 E 8  
VENT RATE (KT-FT) 60939 69500  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 4 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-260845-  
EASTERN INTERIOR-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 0 20  
TEMP (24H TREND) 91 (+1) 74 (0) 89  
RH % (24H TREND) 43 (-10) 85 (-4) 48  
20FTWND-VAL/AM(MPH) E 9 E 8  
20FTWND-RDG/PM(MPH) E 11 E 7 E 10  
MIXING HGT(FT-AGL/MSL)7251 6538  
TRANSPORT WND (MPH) E 13 E 13  
VENT RATE (KT-FT) 70070 72252  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 4 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ022-260845-  
LUQUILLO MOUNTAIN RANGE-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 20  
TEMP (24H TREND) 87 (+4) 70 (-1) 84  
RH % (24H TREND) 53 (-12) 88 (-8) 56  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 10 E 8 E 10  
MIXING HGT(FT-AGL/MSL)4411 4944  
TRANSPORT WND (MPH) E 13 E 13  
VENT RATE (KT-FT) 48521 54384  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 4 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ023-260845-  
CENTRAL MOUNTAIN RANGE-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 30  
TEMP (24H TREND) 91 (+5) 68 (-2) 85  
RH % (24H TREND) 44 (-8) 87 (-3) 52  
20FTWND-VAL/AM(MPH) E 9 E 9  
20FTWND-RDG/PM(MPH) E 9 E 6 E 7  
MIXING HGT(FT-AGL/MSL)7301 6795  
TRANSPORT WND (MPH) E 8 E 10  
VENT RATE (KT-FT) 63117 65340  
DISPERSION 5 5  
DSI 5 2 5  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-260845-  
CAYEY MOUNTAIN RANGE-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 10  
TEMP (24H TREND) 88 (+3) 71 (0) 86  
RH % (24H TREND) 48 (-12) 89 (-6) 51  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 12 E 8 E 11  
MIXING HGT(FT-AGL/MSL)5032 6050  
TRANSPORT WND (MPH) E 14 E 13  
VENT RATE (KT-FT) 57984 70524  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 4 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ025-260845-  
VIEQUES-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 20  
TEMP (24H TREND) 88 (+1) 77 (0) 87  
RH % (24H TREND) 58 (-8) 85 (-4) 59  
20FTWND-VAL/AM(MPH) E 12 E 12  
20FTWND-RDG/PM(MPH) E 11 E 12 E 10  
MIXING HGT(FT-AGL/MSL)3407 3414  
TRANSPORT WND (MPH) E 17 E 17  
VENT RATE (KT-FT) 48345 49845  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ026-260845-  
CULEBRA-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 20  
TEMP (24H TREND) 88 (+4) 78 (0) 87  
RH % (24H TREND) 58 (-13) 82 (-4) 60  
20FTWND-VAL/AM(MPH) E 13 E 13  
20FTWND-RDG/PM(MPH) E 11 E 13 E 10  
MIXING HGT(FT-AGL/MSL)3140 3331  
TRANSPORT WND (MPH) E 15 E 18  
VENT RATE (KT-FT) 43960 53296  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ027-260845-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 92 (+2) 76 (0) 89  
RH % (24H TREND) 44 (-11) 80 (-1) 46  
20FTWND-VAL/AM(MPH) E 13 E 11  
20FTWND-RDG/PM(MPH) SE 14 E 9 SE 12  
MIXING HGT(FT-AGL/MSL)6937 7074  
TRANSPORT WND (MPH) E 10 E 10  
VENT RATE (KT-FT) 72050 77110  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 4 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-260845-  
SAINT THOMAS AND SAINT JOHN-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 10  
TEMP (24H TREND) 90 (+3) 77 (-1) 87  
RH % (24H TREND) 52 (-13) 85 (+3) 56  
20FTWND-VAL/AM(MPH) E 12 E 13  
20FTWND-RDG/PM(MPH) E 12 E 12 E 12  
MIXING HGT(FT-AGL/MSL)3215 3304  
TRANSPORT WND (MPH) E 17 E 16  
VENT RATE (KT-FT) 49920 49560  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 2 3  
 
REMARKS...NONE.  
 

 
 
VIZ002-260845-  
ST CROIX-  
431 AM AST THU MAY 25 2017  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 10  
TEMP (24H TREND) 89 (+1) 73 (-3) 87  
RH % (24H TREND) 57 (-7) 98 (+8) 57  
20FTWND-VAL/AM(MPH) E 12 E 12  
20FTWND-RDG/PM(MPH) E 11 E 11 E 11  
MIXING HGT(FT-AGL/MSL)3298 3513  
TRANSPORT WND (MPH) E 17 E 16  
VENT RATE (KT-FT) 49470 48720  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 3 3  
 
REMARKS...NONE.  
 

 
   
FORECAST FOR DAYS 3 THROUGH 7
 
 
   
SATURDAY
 
PARTLY CLOUDY. ISOLATED SHOWERS. LOWS IN THE LOWER  
70S. HIGHS IN THE MID 80S. NORTHEAST WINDS AROUND 10 MPH.    
SUNDAY
 
PARTLY CLOUDY. LOWS IN THE LOWER 70S. HIGHS IN THE MID  
80S. NORTHEAST WINDS AROUND 10 MPH.    
MONDAY
 
PARTLY CLOUDY. LOWS IN THE LOWER 70S. HIGHS IN THE  
UPPER 80S. NORTHEAST WINDS AROUND 10 MPH.    
TUESDAY
 
PARTLY CLOUDY. SCATTERED SHOWERS. LOWS IN THE LOWER  
70S. HIGHS IN THE MID 80S. EAST WINDS AROUND 10 MPH.    
WEDNESDAY
 
MOSTLY CLOUDY. SCATTERED SHOWERS. LOWS IN THE LOWER  
70S. HIGHS IN THE MID 80S. EAST WINDS AROUND 10 MPH.  
 

 
 
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