220  
FNCA52 TJSJ 200841  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
441 AM AST FRI JUL 20 2018  
   
DISCUSSION
 
A SIGNIFICANT DRYING TREND WILL OCCUR TODAY COMPARED  
TO YESTERDAY, AS A VERY DRY AIR MASS ENCOMPASS THE REGION. THE  
FIRE RISK IS EXPECTED TO BE RELATIVELY LOW TODAY. THE RELATIVE  
HUMIDITY IS EXPECTED TO REMAIN ABOVE 50%. THE LOCAL WINDS WILL BE  
AT AROUND 15 MPH WITH OCCASIONAL GUSTS. THE KBDI VALUES ARE STILL  
BELOW 600 AND THE FUEL MOISTURE AT 10% OR HIGHER.  
 
PRZ014-210845-  
SOUTHEAST COASTAL PLAINS-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 91 (0) 71 (-4) 92  
RH % (24H TREND) 55 (-2) 89 (-1) 46  
20FTWND-VAL/AM(MPH) E 13 E 11  
20FTWND-RDG/PM(MPH) SE 14 E 8 SE 13  
MIXING HGT(FT-AGL/MSL)5215 6147  
TRANSPORT WND (MPH) E 17 E 14  
VENT RATE (KT-FT) 84626 71305  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-210845-  
SOUTHERN HILLS-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 20  
TEMP (24H TREND) 89 (+2) 70 (-3) 91  
RH % (24H TREND) 57 (-3) 90 (-1) 51  
20FTWND-VAL/AM(MPH) E 13 E 10  
20FTWND-RDG/PM(MPH) SE 13 E 8 E 10  
MIXING HGT(FT-AGL/MSL)5241 6203  
TRANSPORT WND (MPH) E 16 E 12  
VENT RATE (KT-FT) 78615 67111  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-210845-  
NORTH COASTAL PLAINS-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 0 20  
TEMP (24H TREND) 91 (+3) 74 (-3) 91  
RH % (24H TREND) 55 (-11) 87 (-2) 53  
20FTWND-VAL/AM(MPH) E 12 E 10  
20FTWND-RDG/PM(MPH) E 14 E 10 E 14  
MIXING HGT(FT-AGL/MSL)5517 5480  
TRANSPORT WND (MPH) E 16 E 14  
VENT RATE (KT-FT) 77640 65148  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 4 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-210845-  
NORTHERN HILLS-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 20  
TEMP (24H TREND) 91 (+3) 71 (-3) 91  
RH % (24H TREND) 55 (-8) 92 (0) 52  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 10 E 7 NE 11  
MIXING HGT(FT-AGL/MSL)5934 6034  
TRANSPORT WND (MPH) E 14 E 12  
VENT RATE (KT-FT) 75960 64464  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-210845-  
WEST COAST-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE TSTMS  
CHANCE PRECIP (%) 10 0 50  
TEMP (24H TREND) 90 (+2) 73 (-3) 91  
RH % (24H TREND) 55 (-5) 88 (+1) 53  
20FTWND-VAL/AM(MPH) E 11 E 9  
20FTWND-RDG/PM(MPH) SE 12 E 6 E 7  
MIXING HGT(FT-AGL/MSL)5826 6159  
TRANSPORT WND (MPH) E 14 E 7  
VENT RATE (KT-FT) 79065 55431  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-210845-  
EASTERN INTERIOR-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 20  
TEMP (24H TREND) 90 (+3) 71 (-4) 90  
RH % (24H TREND) 61 (-2) 91 (-2) 53  
20FTWND-VAL/AM(MPH) E 12 E 9  
20FTWND-RDG/PM(MPH) SE 12 E 8 E 11  
MIXING HGT(FT-AGL/MSL)5456 6241  
TRANSPORT WND (MPH) E 16 E 13  
VENT RATE (KT-FT) 73455 63072  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 2 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ022-210845-  
LUQUILLO MOUNTAIN RANGE-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 86 (+3) 69 (-4) 87  
RH % (24H TREND) 71 (-4) 89 (-3) 66  
20FTWND-VAL/AM(MPH) E 12 E 10  
20FTWND-RDG/PM(MPH) E 13 E 8 E 11  
MIXING HGT(FT-AGL/MSL)4355 4430  
TRANSPORT WND (MPH) E 18 E 14  
VENT RATE (KT-FT) 72709 54756  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 2 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ023-210845-  
CENTRAL MOUNTAIN RANGE-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 40  
TEMP (24H TREND) 89 (+5) 66 (-4) 90  
RH % (24H TREND) 56 (-8) 96 (+1) 53  
20FTWND-VAL/AM(MPH) E 11 E 9  
20FTWND-RDG/PM(MPH) SE 11 E 6 E 7  
MIXING HGT(FT-AGL/MSL)6152 6548  
TRANSPORT WND (MPH) E 13 E 8  
VENT RATE (KT-FT) 67776 54320  
DISPERSION 5 5  
DSI 6 3 5  
LAL 1 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-210845-  
CAYEY MOUNTAIN RANGE-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 0 20  
TEMP (24H TREND) 86 (+2) 70 (-3) 88  
RH % (24H TREND) 66 (-1) 88 (-4) 60  
20FTWND-VAL/AM(MPH) E 12 E 10  
20FTWND-RDG/PM(MPH) E 12 E 8 E 11  
MIXING HGT(FT-AGL/MSL)4651 4864  
TRANSPORT WND (MPH) E 20 E 14  
VENT RATE (KT-FT) 77350 57447  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 2 3 2  
 
REMARKS...NONE.  
 

 
 
PRZ025-210845-  
VIEQUES-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 91 (+4) 79 (-1) 90  
RH % (24H TREND) 68 (-4) 81 (-5) 66  
20FTWND-VAL/AM(MPH) E 15 E 12  
20FTWND-RDG/PM(MPH) E 14 E 12 E 11  
MIXING HGT(FT-AGL/MSL)4111 4220  
TRANSPORT WND (MPH) E 22 E 20  
VENT RATE (KT-FT) 78109 71740  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ026-210845-  
CULEBRA-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 93 (+6) 79 (-1) 93  
RH % (24H TREND) 63 (-8) 84 (-3) 61  
20FTWND-VAL/AM(MPH) E 16 E 13  
20FTWND-RDG/PM(MPH) E 14 E 14 E 11  
MIXING HGT(FT-AGL/MSL)3983 4242  
TRANSPORT WND (MPH) E 23 E 20  
VENT RATE (KT-FT) 79660 72114  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ027-210845-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR CLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 10 0 10  
TEMP (24H TREND) 90 (0) 72 (-4) 92  
RH % (24H TREND) 50 (-9) 88 (+1) 46  
20FTWND-VAL/AM(MPH) E 15 E 12  
20FTWND-RDG/PM(MPH) SE 16 E 10 SE 12  
MIXING HGT(FT-AGL/MSL)5393 6378  
TRANSPORT WND (MPH) E 21 E 10  
VENT RATE (KT-FT) 97679 68167  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-210845-  
SAINT THOMAS AND SAINT JOHN-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 89 (+2) 75 (-2) 90  
RH % (24H TREND) 69 (-4) 84 (-5) 65  
20FTWND-VAL/AM(MPH) E 16 E 13  
20FTWND-RDG/PM(MPH) E 14 E 13 E 11  
MIXING HGT(FT-AGL/MSL)4119 4346  
TRANSPORT WND (MPH) E 25 E 20  
VENT RATE (KT-FT) 90618 73882  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 4 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ002-210845-  
ST CROIX-  
441 AM AST FRI JUL 20 2018  
 
TODAY TONIGHT SAT  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 89 (+1) 75 (-3) 89  
RH % (24H TREND) 68 (-2) 85 (-2) 65  
20FTWND-VAL/AM(MPH) E 16 E 13  
20FTWND-RDG/PM(MPH) E 14 E 13 E 11  
MIXING HGT(FT-AGL/MSL)4187 4115  
TRANSPORT WND (MPH) E 25 E 21  
VENT RATE (KT-FT) 95772 74070  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 4 2  
 
REMARKS...NONE.  
 

 
 

 
 
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