831  
FNCA52 TJSJ 230939  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
539 AM AST WED MAY 23 2018  
   
DISCUSSION
 
A MOIST SOUTHEAST WIND FLOW WILL CONTINUE TO PREVAIL  
ACROSS THE LOCAL REGION TODAY. SHOWERS WITH ISOLATED THUNDERSTORMS  
ARE EXPECTED TO DEVELOP ACROSS THE WESTERN INTERIOR AND NORTHWEST  
SECTIONS OF PUERTO RICO. ELSEWHERE, PASSING SHOWERS ARE POSSIBLE  
FROM TIME TO TIME. RELATIVE HUMIDITY VALUES WILL REMAIN ABOVE  
CRITICAL LEVELS. EAST WINDS AT 10 TO 15 MPH ARE EXPECTED TODAY.  
FIRE DANGER IS EXPECTED TO BE LOW.  
 
PRZ014-240945-  
SOUTHEAST COASTAL PLAINS-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 20  
TEMP (24H TREND) 92 (+2) 71 (-1) 91  
RH % (24H TREND) 53 (+4) 91 (+2) 52  
20FTWND-VAL/AM(MPH) E 12 E 11  
20FTWND-RDG/PM(MPH) E 14 E 9 SE 14  
MIXING HGT(FT-AGL/MSL)6429 6268  
TRANSPORT WND (MPH) E 17 E 14  
VENT RATE (KT-FT) 95940 78143  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-240945-  
SOUTHERN HILLS-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 20 20  
TEMP (24H TREND) 87 (+2) 69 (-1) 89  
RH % (24H TREND) 59 (+1) 92 (+3) 56  
20FTWND-VAL/AM(MPH) E 11 E 11  
20FTWND-RDG/PM(MPH) E 12 E 9 SE 12  
MIXING HGT(FT-AGL/MSL)6316 6179  
TRANSPORT WND (MPH) E 15 E 14  
VENT RATE (KT-FT) 88424 74148  
DISPERSION 5 5  
DSI 5 4 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-240945-  
NORTH COASTAL PLAINS-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 20 40  
TEMP (24H TREND) 89 (+1) 72 (-2) 89  
RH % (24H TREND) 58 (+2) 88 (+3) 58  
20FTWND-VAL/AM(MPH) E 11 E 11  
20FTWND-RDG/PM(MPH) E 14 E 11 E 13  
MIXING HGT(FT-AGL/MSL)5912 5501  
TRANSPORT WND (MPH) E 16 E 14  
VENT RATE (KT-FT) 87945 75152  
DISPERSION 5 5  
DSI 6 6 6  
LAL 2 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-240945-  
NORTHERN HILLS-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 20 60  
TEMP (24H TREND) 89 (+2) 69 (-1) 88  
RH % (24H TREND) 62 (+4) 94 (+3) 60  
20FTWND-VAL/AM(MPH) E 10 E 10  
20FTWND-RDG/PM(MPH) NE 12 E 8 NE 9  
MIXING HGT(FT-AGL/MSL)5848 5623  
TRANSPORT WND (MPH) E 14 E 13  
VENT RATE (KT-FT) 83445 69979  
DISPERSION 5 5  
DSI 6 5 6  
LAL 2 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-240945-  
WEST COAST-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 20 30  
TEMP (24H TREND) 89 (+2) 72 (-1) 88  
RH % (24H TREND) 58 (+3) 87 (+2) 57  
20FTWND-VAL/AM(MPH) E 10 E 10  
20FTWND-RDG/PM(MPH) E 10 E 6 E 10  
MIXING HGT(FT-AGL/MSL)6280 6078  
TRANSPORT WND (MPH) E 12 E 12  
VENT RATE (KT-FT) 81640 72936  
DISPERSION 5 5  
DSI 6 5 6  
LAL 2 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-240945-  
EASTERN INTERIOR-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 20 30  
TEMP (24H TREND) 88 (+2) 69 (-3) 89  
RH % (24H TREND) 64 (+4) 94 (+4) 62  
20FTWND-VAL/AM(MPH) E 10 E 9  
20FTWND-RDG/PM(MPH) E 12 E 8 E 11  
MIXING HGT(FT-AGL/MSL)5843 5697  
TRANSPORT WND (MPH) E 16 E 14  
VENT RATE (KT-FT) 78930 68068  
DISPERSION 5 5  
DSI 6 4 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ022-240945-  
LUQUILLO MOUNTAIN RANGE-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 30 30  
TEMP (24H TREND) 83 (+2) 69 (-2) 85  
RH % (24H TREND) 78 (+7) 93 (+6) 76  
20FTWND-VAL/AM(MPH) E 10 E 10  
20FTWND-RDG/PM(MPH) E 12 E 9 E 11  
MIXING HGT(FT-AGL/MSL)3816 3976  
TRANSPORT WND (MPH) E 16 E 15  
VENT RATE (KT-FT) 56224 51688  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ023-240945-  
CENTRAL MOUNTAIN RANGE-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 50 20 50  
TEMP (24H TREND) 87 (+4) 67 (-1) 86  
RH % (24H TREND) 62 (0) 97 (+4) 60  
20FTWND-VAL/AM(MPH) E 10 E 10  
20FTWND-RDG/PM(MPH) E 10 E 7 E 9  
MIXING HGT(FT-AGL/MSL)5820 5777  
TRANSPORT WND (MPH) E 13 E 12  
VENT RATE (KT-FT) 69641 60280  
DISPERSION 5 5  
DSI 5 3 5  
LAL 2 1 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-240945-  
CAYEY MOUNTAIN RANGE-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 30 20  
TEMP (24H TREND) 83 (0) 70 (-1) 86  
RH % (24H TREND) 70 (+4) 92 (+5) 70  
20FTWND-VAL/AM(MPH) E 10 E 10  
20FTWND-RDG/PM(MPH) E 12 E 9 E 12  
MIXING HGT(FT-AGL/MSL)5063 5162  
TRANSPORT WND (MPH) E 17 E 15  
VENT RATE (KT-FT) 73785 69776  
DISPERSION 5 5  
DSI 6 5 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ025-240945-  
VIEQUES-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 30 30  
TEMP (24H TREND) 86 (0) 77 (+1) 89  
RH % (24H TREND) 70 (+4) 82 (+3) 71  
20FTWND-VAL/AM(MPH) E 14 E 13  
20FTWND-RDG/PM(MPH) E 15 E 14 E 13  
MIXING HGT(FT-AGL/MSL)3243 3140  
TRANSPORT WND (MPH) E 20 E 17  
VENT RATE (KT-FT) 56862 45045  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ026-240945-  
CULEBRA-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 30 30 30  
TEMP (24H TREND) 87 (+4) 77 (+1) 86  
RH % (24H TREND) 70 (0) 82 (+1) 70  
20FTWND-VAL/AM(MPH) E 15 E 13  
20FTWND-RDG/PM(MPH) E 15 E 16 E 13  
MIXING HGT(FT-AGL/MSL)3148 2915  
TRANSPORT WND (MPH) E 21 E 17  
VENT RATE (KT-FT) 56664 43725  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ027-240945-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 10  
TEMP (24H TREND) 91 (+2) 72 (-1) 91  
RH % (24H TREND) 51 (0) 88 (+4) 50  
20FTWND-VAL/AM(MPH) E 14 E 14  
20FTWND-RDG/PM(MPH) SE 15 E 11 SE 14  
MIXING HGT(FT-AGL/MSL)6465 6350  
TRANSPORT WND (MPH) E 16 E 14  
VENT RATE (KT-FT) 92415 79391  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-240945-  
SAINT THOMAS AND SAINT JOHN-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 30 30  
TEMP (24H TREND) 88 (+5) 73 (-2) 86  
RH % (24H TREND) 70 (+5) 84 (+2) 72  
20FTWND-VAL/AM(MPH) E 14 E 13  
20FTWND-RDG/PM(MPH) E 14 E 15 E 13  
MIXING HGT(FT-AGL/MSL)3187 2945  
TRANSPORT WND (MPH) E 21 E 17  
VENT RATE (KT-FT) 57366 44175  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ002-240945-  
ST CROIX-  
539 AM AST WED MAY 23 2018  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 30 30  
TEMP (24H TREND) 87 (+2) 72 (-1) 88  
RH % (24H TREND) 70 (+4) 85 (+4) 72  
20FTWND-VAL/AM(MPH) E 14 E 13  
20FTWND-RDG/PM(MPH) E 14 E 14 E 13  
MIXING HGT(FT-AGL/MSL)3204 2946  
TRANSPORT WND (MPH) E 21 E 17  
VENT RATE (KT-FT) 57672 44190  
DISPERSION 5 5  
DSI 6 6 6  
LAL 1 1 1  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 

 
 
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