397  
FNCA52 TJSJ 170716  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
316 AM AST SAT FEB 17 2018  
   
DISCUSSION
 
THE LOCAL WINDS WILL CONTINUE TO BE MODERATE TODAY,  
GENERALLY AT 10-15MPH ACROSS THE SOUTH COASTAL PLAINS,  
OCCASIONALLY HIGHER ACROSS NORTHERN PR. RELATIVE HUMIDITY VALUES  
EXPECTED TO BE NEAR THE CRITICAL THRESHOLDS AND THE KBDI VALUES  
CONTINUE TO INCREASE. CONTINUED DRYING OF FUELS IS EXPECTED FOR  
THE NEXT SEVERAL DAYS. FUEL MOISTURE IS GENERALLY IN THE 8-10%  
RANGE ACROSS THE SOUTH COASTAL PLAINS OF PR, HIGHER ELSEWHERE.  
THERE IS A SLIGHTLY HEIGHTENED CHANCE OF WILDFIRES TODAY DUE TO  
THE HIGH KBDI AND THE RELATIVE HUMIDITY BEING CLOSE TO THE  
CRITICAL THRESHOLDS, BUT THE WINDS ARE EXPECTED TO BE BELOW ITS  
CRITICAL THRESHOLDS. HOWEVER, THE LOCAL WINDS WILL INCREASE  
SIGNIFICANTLY BY THE UPCOMING WORKWEEK, SO THE FIRE DANGER IS  
EXPECTED TO INCREASE SIGNIFICANTLY FOR THE EARLY PART OF THE  
UPCOMING WEEK, ESPECIALLY WHEN MOISTURE IS STILL EXPECTED TO BE  
LOW.  
 
PRZ014-180730-  
SOUTHEAST COASTAL PLAINS-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 20  
TEMP (24H TREND) 84 (-2) 65 (-3) 86  
RH % (24H TREND) 48 (+1) 96 (+6) 45  
20FTWND-VAL/AM(MPH) NE 12 E 12  
20FTWND-RDG/PM(MPH) E 14 NE 10 E 16  
MIXING HGT(FT-AGL/MSL)7104 7025  
TRANSPORT WND (MPH) E 18 E 23  
VENT RATE (KT-FT) 110375 135225  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-180730-  
SOUTHERN HILLS-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 20  
TEMP (24H TREND) 81 (0) 62 (-3) 83  
RH % (24H TREND) 51 (+2) 100 (+7) 49  
20FTWND-VAL/AM(MPH) NE 12 E 11  
20FTWND-RDG/PM(MPH) E 12 NE 10 E 14  
MIXING HGT(FT-AGL/MSL)7198 7197  
TRANSPORT WND (MPH) E 17 E 21  
VENT RATE (KT-FT) 99855 129982  
DISPERSION 5 5  
DSI 6 4 5  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-180730-  
NORTH COASTAL PLAINS-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 20 20  
TEMP (24H TREND) 80 (-2) 65 (-6) 86  
RH % (24H TREND) 62 (+4) 100 (+11) 52  
20FTWND-VAL/AM(MPH) E 12 E 12  
20FTWND-RDG/PM(MPH) E 14 E 11 E 16  
MIXING HGT(FT-AGL/MSL)5817 5944  
TRANSPORT WND (MPH) E 21 E 22  
VENT RATE (KT-FT) 97795 112487  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-180730-  
NORTHERN HILLS-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 20 20  
TEMP (24H TREND) 79 (-2) 62 (-4) 84  
RH % (24H TREND) 60 (+7) 100 (+6) 51  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) NE 12 E 8 E 14  
MIXING HGT(FT-AGL/MSL)6385 6837  
TRANSPORT WND (MPH) E 18 E 20  
VENT RATE (KT-FT) 97952 114480  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-180730-  
WEST COAST-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 10 20  
TEMP (24H TREND) 84 (-1) 63 (-5) 84  
RH % (24H TREND) 51 (+1) 100 (+10) 51  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 10 E 9 E 11  
MIXING HGT(FT-AGL/MSL)7155 7175  
TRANSPORT WND (MPH) E 15 E 16  
VENT RATE (KT-FT) 85860 118695  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-180730-  
EASTERN INTERIOR-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 20 20  
TEMP (24H TREND) 81 (-1) 62 (-5) 85  
RH % (24H TREND) 60 (+4) 100 (+5) 52  
20FTWND-VAL/AM(MPH) NE 10 E 10  
20FTWND-RDG/PM(MPH) E 12 E 8 E 13  
MIXING HGT(FT-AGL/MSL)6411 6657  
TRANSPORT WND (MPH) E 18 E 21  
VENT RATE (KT-FT) 99824 116640  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ022-180730-  
LUQUILLO MOUNTAIN RANGE-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 50 30 30  
TEMP (24H TREND) 78 (0) 60 (-5) 80  
RH % (24H TREND) 66 (+4) 100 (+2) 61  
20FTWND-VAL/AM(MPH) E 11 E 12  
20FTWND-RDG/PM(MPH) E 11 E 9 E 13  
MIXING HGT(FT-AGL/MSL)4400 4350  
TRANSPORT WND (MPH) E 17 E 21  
VENT RATE (KT-FT) 66936 76823  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 2 4  
 
REMARKS...NONE.  
 

 
 
PRZ023-180730-  
CENTRAL MOUNTAIN RANGE-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 10 20  
TEMP (24H TREND) 79 (0) 60 (-4) 81  
RH % (24H TREND) 56 (+4) 100 (+5) 53  
20FTWND-VAL/AM(MPH) NE 10 E 10  
20FTWND-RDG/PM(MPH) NE 11 E 9 E 13  
MIXING HGT(FT-AGL/MSL)6928 7284  
TRANSPORT WND (MPH) E 16 E 17  
VENT RATE (KT-FT) 96992 116544  
DISPERSION 5 5  
DSI 5 3 5  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-180730-  
CAYEY MOUNTAIN RANGE-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 20 20  
TEMP (24H TREND) 78 (-1) 61 (-3) 79  
RH % (24H TREND) 61 (+4) 100 (+3) 58  
20FTWND-VAL/AM(MPH) NE 10 E 10  
20FTWND-RDG/PM(MPH) E 12 NE 8 E 14  
MIXING HGT(FT-AGL/MSL)5277 5028  
TRANSPORT WND (MPH) E 20 E 22  
VENT RATE (KT-FT) 93318 98192  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 3 2 3  
 
REMARKS...NONE.  
 

 
 
PRZ025-180730-  
VIEQUES-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 50 30 30  
TEMP (24H TREND) 81 (-1) 69 (-1) 84  
RH % (24H TREND) 64 (+3) 98 (+3) 61  
20FTWND-VAL/AM(MPH) E 16 E 17  
20FTWND-RDG/PM(MPH) E 14 E 14 E 17  
MIXING HGT(FT-AGL/MSL)3806 3705  
TRANSPORT WND (MPH) E 20 E 24  
VENT RATE (KT-FT) 64702 77095  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 4  
 
REMARKS...NONE.  
 

 
 
PRZ026-180730-  
CULEBRA-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 50 30 30  
TEMP (24H TREND) 81 (-2) 71 (-2) 85  
RH % (24H TREND) 65 (+3) 94 (+4) 59  
20FTWND-VAL/AM(MPH) E 16 E 18  
20FTWND-RDG/PM(MPH) E 15 E 16 E 18  
MIXING HGT(FT-AGL/MSL)3748 3550  
TRANSPORT WND (MPH) E 24 E 26  
VENT RATE (KT-FT) 78708 82106  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 4  
 
REMARKS...NONE.  
 

 
 
PRZ027-180730-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 20  
TEMP (24H TREND) 84 (-1) 63 (-6) 86  
RH % (24H TREND) 48 (+1) 100 (+11) 45  
20FTWND-VAL/AM(MPH) E 11 E 12  
20FTWND-RDG/PM(MPH) E 13 E 10 E 15  
MIXING HGT(FT-AGL/MSL)7446 7363  
TRANSPORT WND (MPH) E 15 E 18  
VENT RATE (KT-FT) 103712 135923  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-180730-  
SAINT THOMAS AND SAINT JOHN-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 30 30  
TEMP (24H TREND) 85 (+2) 69 (-3) 84  
RH % (24H TREND) 57 (0) 97 (+10) 57  
20FTWND-VAL/AM(MPH) E 15 E 17  
20FTWND-RDG/PM(MPH) E 14 E 15 E 17  
MIXING HGT(FT-AGL/MSL)3700 3543  
TRANSPORT WND (MPH) E 24 E 26  
VENT RATE (KT-FT) 77700 81489  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 4  
 
REMARKS...NONE.  
 

 
 
VIZ002-180730-  
ST CROIX-  
316 AM AST SAT FEB 17 2018  
 
TODAY TONIGHT SUN  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 30 30  
TEMP (24H TREND) 85 (+2) 69 (-2) 85  
RH % (24H TREND) 57 (-2) 95 (+3) 55  
20FTWND-VAL/AM(MPH) E 16 E 17  
20FTWND-RDG/PM(MPH) E 14 E 15 E 17  
MIXING HGT(FT-AGL/MSL)3541 3680  
TRANSPORT WND (MPH) E 25 E 24  
VENT RATE (KT-FT) 77902 80960  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 4 4  
 
REMARKS...NONE.  
 

 
 
   
FORECAST FOR DAYS 3 THROUGH 7
 
 
   
MONDAY
 
PARTLY CLOUDY. ISOLATED SHOWERS. LOWS IN THE UPPER 60S.  
HIGHS IN THE LOWER 80S. NORTHEAST WINDS AROUND 15 MPH.    
TUESDAY
 
PARTLY CLOUDY. LOWS IN THE UPPER 60S. HIGHS IN THE  
LOWER 80S. NORTHEAST WINDS AROUND 15 MPH.    
WEDNESDAY
 
PARTLY CLOUDY. LOWS IN THE UPPER 60S. HIGHS IN THE  
UPPER 70S. NORTHEAST WINDS AROUND 15 MPH.    
THURSDAY
 
PARTLY CLOUDY. LOWS IN THE UPPER 60S. HIGHS IN THE  
UPPER 70S. NORTHEAST WINDS AROUND 15 MPH.    
FRIDAY
 
PARTLY CLOUDY. LOWS IN THE UPPER 60S. HIGHS IN THE  
UPPER 70S. NORTHEAST WINDS AROUND 10 MPH.  
 

 
 
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