492  
FNCA52 TJSJ 240910  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
510 AM AST THU JUL 24 2025  
   
DISCUSSION
 
 
BREEZY TO WINDY CONDITIONS ARE EXPECTED TODAY ACROSS THE REGION,  
WITH WINDS BETWEEN 15 - 20 MPH AND GUSTS UP TO 30 MPH. ONCE AGAIN,  
THE SOUTHERN COASTAL PLAINS ARE THE MAIN CONCERN DUE TO THE  
PRECIPITATION DEFICIT AND ABNORMALLY DRY SOILS. ADDITIONALLY,  
KDBI VALUES CONTINUE WELL ABOVE FIRE WEATHER CRITERIA OVER THIS  
AREA (623 AT CABO ROJO AND 670 AT GUANICA). ALTHOUGH THE TREND  
SUGGESTS RELATIVE HUMIDITIES DROPPING TO BELOW THRESHOLDS (43 -  
48%), CURRENT SATELLITE DERIVED PRODUCTS SHOW MOISTURE CONTENT  
ASSOCIATED TO THE TROPICAL WAVE SOUTH OF THE REGION, WHERE  
RELATIVE HUMIDITY VALUES STAYING SLIGHTLY ABOVE THRESHOLDS. GIVEN  
THE EXPECTED CONDITIONS FOR TODAY, THE FIRE DANGER RISK SHOULD  
REMAIN LOW.  
 
PRZ014-250915-  
SOUTHEAST COASTAL PLAINS-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 20 40  
TEMP (24H TREND) 94 (+2) 74 (-4) 93  
RH % (24H TREND) 43 (-11) 89 (+4) 43  
WIND 20FT/EARLY(MPH) E 18 G24 E 14 G19 E 20 G26  
WIND 20FT/LATE(MPH) E 18 G24 E 14 G19 E 20 G26  
MIXING HGT(FT-AGL/MSL)5870 5990  
TRANSPORT WND (MPH) E 22 E 18  
VENT RATE (KT-FT) 111530 95840  
DISPERSION 5 5  
DSI 6 4 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ015-250915-  
SOUTHERN HILLS-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 20 20 50  
TEMP (24H TREND) 90 (+4) 70 (-5) 89  
RH % (24H TREND) 54 (-12) 96 (+6) 53  
WIND 20FT/EARLY(MPH) E 16 NE 14 E 14  
WIND 20FT/LATE(MPH) E 16 NE 14 E 14  
MIXING HGT(FT-AGL/MSL)6570 6570  
TRANSPORT WND (MPH) E 21 E 16  
VENT RATE (KT-FT) 118260 91980  
DISPERSION 5 5  
DSI 6 3 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ016-250915-  
NORTH COASTAL PLAINS-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 10 40 60  
TEMP (24H TREND) 90 (0) 74 (-4) 90  
RH % (24H TREND) 62 (-7) 98 (+6) 60  
WIND 20FT/EARLY(MPH) E 23 G25 E 20 G23 E 20 G23  
WIND 20FT/LATE(MPH) E 23 G25 E 20 G23 E 20 G23  
MIXING HGT(FT-AGL/MSL)5580 5510  
TRANSPORT WND (MPH) E 23 E 18  
VENT RATE (KT-FT) 111600 88160  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ017-250915-  
NORTHERN HILLS-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 10 30 60  
TEMP (24H TREND) 89 (+1) 71 (-4) 88  
RH % (24H TREND) 64 (-5) 99 (+5) 63  
WIND 20FT/EARLY(MPH) E 20 E 18 NE 18  
WIND 20FT/LATE(MPH) E 20 E 18 NE 18  
MIXING HGT(FT-AGL/MSL)6510 6030  
TRANSPORT WND (MPH) E 21 E 16  
VENT RATE (KT-FT) 117180 84420  
DISPERSION 5 5  
DSI 6 5 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ018-250915-  
WEST COAST-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 50 0 50  
TEMP (24H TREND) 93 (+1) 71 (-4) 92  
RH % (24H TREND) 55 (-8) 98 (+6) 56  
WIND 20FT/EARLY(MPH) E 18 E 19 E 16  
WIND 20FT/LATE(MPH) E 18 E 19 E 16  
MIXING HGT(FT-AGL/MSL)5420 6480  
TRANSPORT WND (MPH) E 15 E 13  
VENT RATE (KT-FT) 70460 71280  
DISPERSION 5 5  
DSI 6 5 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ019-250915-  
EASTERN INTERIOR-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 50 60  
TEMP (24H TREND) 89 (+2) 71 (-5) 89  
RH % (24H TREND) 62 (-8) 98 (+5) 59  
WIND 20FT/EARLY(MPH) E 16 E 16 E 13  
WIND 20FT/LATE(MPH) E 16 E 16 E 13  
MIXING HGT(FT-AGL/MSL)6300 6990  
TRANSPORT WND (MPH) E 20 E 16  
VENT RATE (KT-FT) 107100 97860  
DISPERSION 5 5  
DSI 6 4 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ022-250915-  
LUQUILLO MOUNTAIN RANGE-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY MCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 30 50 60  
TEMP (24H TREND) 83 (+2) 69 (-4) 83  
RH % (24H TREND) 72 (-11) 100 (+3) 68  
WIND 20FT/EARLY(MPH) E 13 E 12 E 11  
WIND 20FT/LATE(MPH) E 13 E 12 E 11  
MIXING HGT(FT-AGL/MSL)5260 4900  
TRANSPORT WND (MPH) E 21 E 16  
VENT RATE (KT-FT) 94680 68600  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ023-250915-  
CENTRAL MOUNTAIN RANGE-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 20 50  
TEMP (24H TREND) 88 (+4) 67 (-5) 87  
RH % (24H TREND) 61 (-9) 99 (+6) 61  
WIND 20FT/EARLY(MPH) E 14 E 14 E 12  
WIND 20FT/LATE(MPH) E 14 E 14 E 12  
MIXING HGT(FT-AGL/MSL)8330 6830  
TRANSPORT WND (MPH) E 16 E 15  
VENT RATE (KT-FT) 116620 88790  
DISPERSION 5 5  
DSI 6 3 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ024-250915-  
CAYEY MOUNTAIN RANGE-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 40 50  
TEMP (24H TREND) 84 (+2) 70 (-3) 85  
RH % (24H TREND) 68 (-7) 100 (+2) 63  
WIND 20FT/EARLY(MPH) E 13 NE 12 E 12  
WIND 20FT/LATE(MPH) E 13 NE 12 E 12  
MIXING HGT(FT-AGL/MSL)5590 5870  
TRANSPORT WND (MPH) E 22 E 16  
VENT RATE (KT-FT) 106210 82180  
DISPERSION 5 5  
DSI 6 4 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ025-250915-  
VIEQUES-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 40 60  
TEMP (24H TREND) 89 (0) 77 (-2) 89  
RH % (24H TREND) 59 (-7) 89 (+2) 57  
WIND 20FT/EARLY(MPH) E 18 G23 E 19 G23 E 14 G18  
WIND 20FT/LATE(MPH) E 18 G23 E 19 G23 E 14 G18  
MIXING HGT(FT-AGL/MSL)3480 3990  
TRANSPORT WND (MPH) E 24 E 21  
VENT RATE (KT-FT) 73080 71820  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ026-250915-  
CULEBRA-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER PCLDY PCLDY MCLDY  
PRECIP TYPE SHOWERS SHOWERS TSTMS  
CHANCE PRECIP (%) 20 40 60  
TEMP (24H TREND) 91 (+2) 78 (-2) 90  
RH % (24H TREND) 61 (-8) 88 (+1) 60  
WIND 20FT/EARLY(MPH) E 18 G22 E 19 G23 E 14 G18  
WIND 20FT/LATE(MPH) E 18 G22 E 19 G23 E 14 G18  
MIXING HGT(FT-AGL/MSL)3550 3540  
TRANSPORT WND (MPH) E 24 E 21  
VENT RATE (KT-FT) 74550 63720  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
PRZ027-250915-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR MCLEAR PCLDY  
PRECIP TYPE SHOWERS NONE SHOWERS  
CHANCE PRECIP (%) 20 0 40  
TEMP (24H TREND) 94 (+2) 73 (-5) 93  
RH % (24H TREND) 46 (-9) 88 (+3) 45  
WIND 20FT/EARLY(MPH) E 25 G33 E 20 G26 E 23 G29  
WIND 20FT/LATE(MPH) E 25 G33 E 20 G26 E 23 G29  
MIXING HGT(FT-AGL/MSL)5750 6470  
TRANSPORT WND (MPH) E 22 E 15  
VENT RATE (KT-FT) 109250 84110  
DISPERSION 5 5  
DSI 6 4 5  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
VIZ001-250915-  
SAINT THOMAS AND SAINT JOHN-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR PCLDY PCLDY  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 30 50  
TEMP (24H TREND) 88 (+2) 75 (-4) 87  
RH % (24H TREND) 65 (-9) 93 (+5) 64  
WIND 20FT/EARLY(MPH) E 17 G21 E 19 G23 E 14 G19  
WIND 20FT/LATE(MPH) E 17 G21 E 19 G23 E 14 G19  
MIXING HGT(FT-AGL/MSL)3480 3400  
TRANSPORT WND (MPH) E 25 E 22  
VENT RATE (KT-FT) 76560 64600  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 
VIZ002-250915-  
ST CROIX-  
510 AM AST THU JUL 24 2025  
 
TODAY TONIGHT FRI  
 
CLOUD COVER MCLEAR PCLDY MCLEAR  
PRECIP TYPE SHOWERS SHOWERS SHOWERS  
CHANCE PRECIP (%) 10 20 10  
TEMP (24H TREND) 89 (+2) 77 (-3) 89  
RH % (24H TREND) 63 (-8) 89 (+1) 63  
WIND 20FT/EARLY(MPH) E 17 G22 E 18 G22 E 14 G19  
WIND 20FT/LATE(MPH) E 17 G22 E 18 G22 E 14 G19  
MIXING HGT(FT-AGL/MSL)4680 4310  
TRANSPORT WND (MPH) E 24 E 18  
VENT RATE (KT-FT) 98280 68960  
DISPERSION 5 5  
DSI 6 6 6  
RH RECOVERY EXCELLENT  
 
REMARKS...NONE.  
 

 
 

 
 
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