184  
FNCA52 TJSJ 220918  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
518 AM AST WED NOV 22 2017  
   
DISCUSSION
 
MOISTURE WILL BEGIN TO INCREASE TODAY AFTER MOSTLY  
SUNNY SKIES THIS MORNING. RELATIVE HUMIDITIES ARE EXPECTED TO  
REMAIN ABOVE CRITICAL LEVELS. WINDS WILL BE LIGHT UNTIL SEA  
BREEZES BEGIN BUT SHOULD REMAIN BELOW 18 MPH. MOISTURE WILL  
CONTINUE TO INCREASE THROUGH FRIDAY. FIRE DANGER IS CONSIDERED TO  
BE LOW AND SOIL MOISTURE ALSO REMAINS HIGH.  
 
PRZ014-230930-  
SOUTHEAST COASTAL PLAINS-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 0 10 10  
TEMP (24H TREND) 88 (+2) 70 (-2) 90  
RH % (24H TREND) 57 (-2) 93 (+3) 60  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) SE 8 LGT/VAR E 8  
MIXING HGT(FT-AGL/MSL)6058 7414  
TRANSPORT WND (MPH) E 10 E 9  
VENT RATE (KT-FT) 49880 66836  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ015-230930-  
SOUTHERN HILLS-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 10 10 40  
TEMP (24H TREND) 86 (+2) 68 (-1) 87  
RH % (24H TREND) 58 (-3) 96 (+1) 61  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) SE 6 LGT/VAR E 6  
MIXING HGT(FT-AGL/MSL)6057 7106  
TRANSPORT WND (MPH) SE 9 E 9  
VENT RATE (KT-FT) 48113 66119  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 2  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ016-230930-  
NORTH COASTAL PLAINS-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 89 (+2) 74 (0) 88  
RH % (24H TREND) 53 (-7) 92 (+7) 64  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) E 8 E 5 E 9  
MIXING HGT(FT-AGL/MSL)6435 6634  
TRANSPORT WND (MPH) SE 8 E 10  
VENT RATE (KT-FT) 53435 60370  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ017-230930-  
NORTHERN HILLS-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 0 20  
TEMP (24H TREND) 89 (+2) 71 (0) 86  
RH % (24H TREND) 51 (-5) 91 (+7) 66  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) NE 5 LGT/VAR NE 7  
MIXING HGT(FT-AGL/MSL)6775 6748  
TRANSPORT WND (MPH) SE 7 E 9  
VENT RATE (KT-FT) 50284 54431  
DISPERSION 5 5  
DSI 6 2 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ018-230930-  
WEST COAST-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 0 50  
TEMP (24H TREND) 89 (+1) 71 (-2) 89  
RH % (24H TREND) 50 (-5) 93 (+5) 52  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) E 5 LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)6145 6857  
TRANSPORT WND (MPH) E 7 E 8  
VENT RATE (KT-FT) 49157 57777  
DISPERSION 5 5  
DSI 6 2 6  
LAL 1 1 2  
HAINES INDEX 3 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ019-230930-  
EASTERN INTERIOR-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 20 40  
TEMP (24H TREND) 87 (+2) 70 (-1) 87  
RH % (24H TREND) 55 (-5) 95 (+5) 67  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) E 6 LGT/VAR E 7  
MIXING HGT(FT-AGL/MSL)6951 6953  
TRANSPORT WND (MPH) SE 9 E 10  
VENT RATE (KT-FT) 52889 65940  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 2  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ022-230930-  
LUQUILLO MOUNTAIN RANGE-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 30 50  
TEMP (24H TREND) 84 (+3) 68 (0) 80  
RH % (24H TREND) 62 (-4) 100 (+2) 81  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) E 7 LGT/VAR E 8  
MIXING HGT(FT-AGL/MSL)5161 5656  
TRANSPORT WND (MPH) SE 12 E 12  
VENT RATE (KT-FT) 50409 53984  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ023-230930-  
CENTRAL MOUNTAIN RANGE-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS NONE TSTMS  
CHANCE PRECIP (%) 30 0 50  
TEMP (24H TREND) 87 (+3) 66 (-1) 84  
RH % (24H TREND) 50 (-6) 93 (+1) 65  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)7099 6954  
TRANSPORT WND (MPH) SE 7 E 8  
VENT RATE (KT-FT) 43317 53956  
DISPERSION 5 5  
DSI 6 2 6  
LAL 1 1 2  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ024-230930-  
CAYEY MOUNTAIN RANGE-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 0 20 30  
TEMP (24H TREND) 83 (+2) 68 (0) 81  
RH % (24H TREND) 62 (-2) 99 (+1) 77  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) E 7 LGT/VAR E 8  
MIXING HGT(FT-AGL/MSL)5295 6159  
TRANSPORT WND (MPH) SE 12 E 12  
VENT RATE (KT-FT) 48338 60220  
DISPERSION 5 5  
DSI 6 3 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ025-230930-  
VIEQUES-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 0 30 50  
TEMP (24H TREND) 84 (-1) 74 (0) 85  
RH % (24H TREND) 65 (+2) 100 (+8) 73  
20FTWND-VAL/AM(MPH) E 5 E 7  
20FTWND-RDG/PM(MPH) E 8 E 7 E 11  
MIXING HGT(FT-AGL/MSL)4929 5962  
TRANSPORT WND (MPH) E 10 E 12  
VENT RATE (KT-FT) 46332 61878  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ026-230930-  
CULEBRA-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 30 50  
TEMP (24H TREND) 85 (0) 76 (+1) 85  
RH % (24H TREND) 64 (0) 100 (+9) 72  
20FTWND-VAL/AM(MPH) E 6 E 9  
20FTWND-RDG/PM(MPH) E 8 E 7 E 11  
MIXING HGT(FT-AGL/MSL)5150 5718  
TRANSPORT WND (MPH) E 12 E 12  
VENT RATE (KT-FT) 51112 59567  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
PRZ027-230930-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 0 0 20  
TEMP (24H TREND) 88 (+1) 70 (-3) 90  
RH % (24H TREND) 55 (-4) 90 (-2) 53  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) SE 8 LGT/VAR SE 6  
MIXING HGT(FT-AGL/MSL)6090 7468  
TRANSPORT WND (MPH) E 10 E 7  
VENT RATE (KT-FT) 53677 51838  
DISPERSION 5 5  
DSI 6 2 6  
LAL 1 1 2  
HAINES INDEX 3 2 2  
 
REMARKS...NONE.  
 

 
 
VIZ001-230930-  
SAINT THOMAS AND SAINT JOHN-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 30 50  
TEMP (24H TREND) 86 (+1) 75 (0) 84  
RH % (24H TREND) 65 (+1) 98 (+7) 74  
20FTWND-VAL/AM(MPH) E 6 E 10  
20FTWND-RDG/PM(MPH) E 8 E 9 E 11  
MIXING HGT(FT-AGL/MSL)5440 5676  
TRANSPORT WND (MPH) E 12 E 14  
VENT RATE (KT-FT) 51804 69022  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
VIZ002-230930-  
ST CROIX-  
518 AM AST WED NOV 22 2017  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 0 30 50  
TEMP (24H TREND) 85 (-3) 73 (0) 86  
RH % (24H TREND) 63 (+4) 100 (+9) 68  
20FTWND-VAL/AM(MPH) E 5 E 10  
20FTWND-RDG/PM(MPH) E 10 E 8 E 11  
MIXING HGT(FT-AGL/MSL)5216 6285  
TRANSPORT WND (MPH) E 12 E 14  
VENT RATE (KT-FT) 54411 77987  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 2 2 2  
 
REMARKS...NONE.  
 

 
 
   
FORECAST FOR DAYS 3 THROUGH 7
 
 
   
FRIDAY
 
PARTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED  
THUNDERSTORMS. LOWS IN THE LOWER 70S. HIGHS IN THE MID 80S. EAST  
WINDS AROUND 5 MPH.    
SATURDAY
 
PARTLY CLOUDY. LOWS IN THE LOWER 70S. HIGHS IN THE  
LOWER 80S. NORTH WINDS AROUND 5 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS IN THE UPPER 60S. HIGHS IN THE MID  
80S. EAST WINDS AROUND 5 MPH.    
MONDAY
 
PARTLY CLOUDY. LOWS IN THE LOWER 70S. HIGHS IN THE MID  
80S. NORTH WINDS AROUND 5 MPH.    
TUESDAY
 
PARTLY CLOUDY. SCATTERED SHOWERS. LOWS IN THE UPPER  
60S. HIGHS IN THE LOWER 80S. NORTHEAST WINDS AROUND 5 MPH.  
 

 
 
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