403  
FNCA52 TJSJ 230914  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
514 AM AST WED JUL 23 2025  
   
DISCUSSION
 
 
TODAY, AN INCREASE IN WINDS FROM THE E-ESE (BETWEEN 15 - 20 MPH)  
WITH GUSTS UP TO 30 MPH WITH BRING BREEZY TO LOCALLY WINDY  
CONDITIONS. A TROPICAL WAVE APPROACHING THE REGION SHOULD REMAIN  
SOUTH, NEVERTHELESS, MOISTURE CONTENT SHOULD INCREASE ACROSS THE  
AREA, WITH RELATIVE HUMIDITIES ABOVE THRESHOLDS. FROM THE LATEST  
STATIONS REPORTS, PARTICULARLY OVER ABNORMALLY DRY AREAS, KDBI  
VALUES CONTINUE WELL ABOVE THRESHOLDS (619 IN CABO ROJO AND 667 IN  
GUANICA). GIVEN THESE CONDITIONS AND THE WEATHER FORECAST, THE  
FIRE DANGER RISK SHOULD REMAIN LOW. NEVERTHELESS, WE'LL KEEP  
MONITORING THE WEATHER CONDITIONS AND ISSUE AN UPDATE IF  
NECESSARY.  
 
PRZ014-240915-  
SOUTHEAST COASTAL PLAINS-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 10 40  
TEMP (24H TREND) 94 (+3) 76 (-1) 93  
RH % (24H TREND) 47 (-8) 86 (+1) 43  
WIND 20FT/EARLY(MPH) E 19 G26 E 16 G20 E 19 G25  
WIND 20FT/LATE(MPH) E 19 G26 E 16 G20 E 19 G25  
MIXING HGT(FT-AGL/MSL)5230 5730  
TRANSPORT WND (MPH) E 23 E 23  
VENT RATE (KT-FT) 104600 114600  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ015-240915-  
SOUTHERN HILLS-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 30 10 40  
TEMP (24H TREND) 89 (+4) 72 (-2) 89  
RH % (24H TREND) 57 (-11) 96 (+5) 54  
WIND 20FT/EARLY(MPH) E 16 E 16 E 16  
WIND 20FT/LATE(MPH) E 16 E 16 E 16  
MIXING HGT(FT-AGL/MSL)5860 6380  
TRANSPORT WND (MPH) E 22 E 21  
VENT RATE (KT-FT) 111340 114840  
DISPERSION 5 5  
DSI 6 4 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ016-240915-  
NORTH COASTAL PLAINS-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 10 20  
TEMP (24H TREND) 91 (+1) 76 (-1) 91  
RH % (24H TREND) 65 (+1) 97 (+3) 62  
WIND 20FT/EARLY(MPH) E 24 G26 E 24 E 24 G26  
WIND 20FT/LATE(MPH) E 24 G26 E 24 E 24 G26  
MIXING HGT(FT-AGL/MSL)5130 5620  
TRANSPORT WND (MPH) E 23 E 23  
VENT RATE (KT-FT) 102600 112400  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ017-240915-  
NORTHERN HILLS-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR MCLEAR  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 10  
TEMP (24H TREND) 89 (+1) 73 (-1) 89  
RH % (24H TREND) 66 (+1) 98 (+1) 63  
WIND 20FT/EARLY(MPH) E 21 E 21 E 21  
WIND 20FT/LATE(MPH) E 21 E 21 E 21  
MIXING HGT(FT-AGL/MSL)6410 6290  
TRANSPORT WND (MPH) E 20 E 20  
VENT RATE (KT-FT) 108970 106930  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ018-240915-  
WEST COAST-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 10 70  
TEMP (24H TREND) 93 (+2) 73 (-1) 93  
RH % (24H TREND) 57 (-4) 97 (+3) 54  
WIND 20FT/EARLY(MPH) E 17 G19 E 19 E 18  
WIND 20FT/LATE(MPH) E 17 G19 E 19 E 18  
MIXING HGT(FT-AGL/MSL)4690 5620  
TRANSPORT WND (MPH) E 15 E 15  
VENT RATE (KT-FT) 60970 73060  
DISPERSION 5 5  
DSI 5 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ019-240915-  
EASTERN INTERIOR-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 40 50  
TEMP (24H TREND) 89 (+2) 73 (-3) 89  
RH % (24H TREND) 65 (-4) 96 (+2) 63  
WIND 20FT/EARLY(MPH) E 16 E 17 E 14  
WIND 20FT/LATE(MPH) E 16 E 17 E 14  
MIXING HGT(FT-AGL/MSL)5640 6120  
TRANSPORT WND (MPH) E 22 E 20  
VENT RATE (KT-FT) 107160 104040  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ022-240915-  
LUQUILLO MOUNTAIN RANGE-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 40 60  
TEMP (24H TREND) 84 (+4) 70 (-3) 83  
RH % (24H TREND) 76 (-5) 100 (+2) 72  
WIND 20FT/EARLY(MPH) E 14 E 13 E 13  
WIND 20FT/LATE(MPH) E 14 E 13 E 13  
MIXING HGT(FT-AGL/MSL)4190 5170  
TRANSPORT WND (MPH) E 22 E 21  
VENT RATE (KT-FT) 79610 93060  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ023-240915-  
CENTRAL MOUNTAIN RANGE-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY CLEAR PCLDY  
PRECIP TYPE SHOWERS NONE TSTMS  
CHANCE PRECIP (%) 40 0 50  
TEMP (24H TREND) 88 (+5) 69 (-3) 88  
RH % (24H TREND) 63 (-8) 99 (+3) 61  
WIND 20FT/EARLY(MPH) E 13 E 13 E 16  
WIND 20FT/LATE(MPH) E 13 E 13 E 16  
MIXING HGT(FT-AGL/MSL)7600 7700  
TRANSPORT WND (MPH) E 16 E 15  
VENT RATE (KT-FT) 106400 100100  
DISPERSION 5 5  
DSI 6 3 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ024-240915-  
CAYEY MOUNTAIN RANGE-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 40 60  
TEMP (24H TREND) 84 (+2) 71 (-2) 84  
RH % (24H TREND) 70 (-5) 100 (+2) 67  
WIND 20FT/EARLY(MPH) E 14 E 13 E 13  
WIND 20FT/LATE(MPH) E 14 E 13 E 13  
MIXING HGT(FT-AGL/MSL)4760 5480  
TRANSPORT WND (MPH) E 23 E 23  
VENT RATE (KT-FT) 95200 109600  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ025-240915-  
VIEQUES-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 30 10 30  
TEMP (24H TREND) 90 (+1) 78 (-1) 89  
RH % (24H TREND) 61 (-4) 89 (-1) 59  
WIND 20FT/EARLY(MPH) E 19 G23 E 20 G24 E 17 G21  
WIND 20FT/LATE(MPH) E 19 G23 E 20 G24 E 17 G21  
MIXING HGT(FT-AGL/MSL)3320 3900  
TRANSPORT WND (MPH) E 26 E 25  
VENT RATE (KT-FT) 76360 85800  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ026-240915-  
CULEBRA-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 40 10 50  
TEMP (24H TREND) 91 (+2) 79 (-1) 91  
RH % (24H TREND) 62 (-7) 91 (+2) 60  
WIND 20FT/EARLY(MPH) E 19 G23 E 20 G25 E 17 G21  
WIND 20FT/LATE(MPH) E 19 G23 E 20 G25 E 17 G21  
MIXING HGT(FT-AGL/MSL)3320 3920  
TRANSPORT WND (MPH) E 26 E 25  
VENT RATE (KT-FT) 76360 86240  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ027-240915-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 10 10 60  
TEMP (24H TREND) 94 (+3) 76 (-1) 94  
RH % (24H TREND) 49 (-7) 87 (+4) 45  
WIND 20FT/EARLY(MPH) E 24 G31 E 23 G29 E 24 G31  
WIND 20FT/LATE(MPH) E 24 G31 E 23 G29 E 24 G31  
MIXING HGT(FT-AGL/MSL)5380 5870  
TRANSPORT WND (MPH) E 22 E 23  
VENT RATE (KT-FT) 102220 117400  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
VIZ001-240915-  
SAINT THOMAS AND SAINT JOHN-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 30 10 40  
TEMP (24H TREND) 88 (+2) 76 (-3) 88  
RH % (24H TREND) 68 (-5) 93 (+3) 66  
WIND 20FT/EARLY(MPH) E 19 G24 E 21 G27 E 17 G22  
WIND 20FT/LATE(MPH) E 19 G24 E 21 G27 E 17 G22  
MIXING HGT(FT-AGL/MSL)3260 3680  
TRANSPORT WND (MPH) E 28 E 26  
VENT RATE (KT-FT) 78240 84640  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
VIZ002-240915-  
ST CROIX-  
514 AM AST WED JUL 23 2025  
 
TODAY TONIGHT THU  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 40 20 40  
TEMP (24H TREND) 89 (+2) 78 (-1) 89  
RH % (24H TREND) 65 (-6) 90 (+1) 64  
WIND 20FT/EARLY(MPH) E 19 G24 E 20 G24 E 18 G22  
WIND 20FT/LATE(MPH) E 19 G24 E 20 G24 E 18 G22  
MIXING HGT(FT-AGL/MSL)3950 4750  
TRANSPORT WND (MPH) E 30 E 24  
VENT RATE (KT-FT) 102700 99750  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 

 
 
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