912
FNCA52 TJSJ 160907
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
507 AM AST TUE SEP 16 2025
DISCUSSION
A DEPARTING PERTURBATION WILL MAINTAIN RELATIVE HUMIDITIES MAINLY
ABOVE FIRE WEATHER CRITICAL VALUES. WINDS WILL SHIFT FROM THE
EAST TO NORTHEAST AT 15-20 MPH TODAY. THE RISK OF SPREADING FIRES
SHOULD BE MAINLY LOW AGAIN FOR TODAY. A TROPICAL WAVE COMBINED
WITH AN UPPER-LEVEL TROUGH, WILL INCREASE THE FREQUENCY OF
SHOWERS AND THUNDERSTORMS PARTICULARLY WEDNESDAY AND THURSDAY
KEEPING THE RISK LOW.
PRZ014-170915-
SOUTHEAST COASTAL PLAINS-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 30 70
TEMP (24H TREND) 92 (+3) 74 (-3) 90
RH % (24H TREND) 52 (-16) 94 (+2) 63
WIND 20FT/EARLY(MPH) E 17 G23 NE 11 E 10
WIND 20FT/LATE(MPH) E 17 G23 NE 11 E 10
MIXING HGT(FT-AGL/MSL)5140 4190
TRANSPORT WND (MPH) E 16 SE 8
VENT RATE (KT-FT) 71960 29330
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-170915-
SOUTHERN HILLS-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 30 80
TEMP (24H TREND) 88 (+4) 71 (-4) 86
RH % (24H TREND) 61 (-13) 98 (+4) 66
WIND 20FT/EARLY(MPH) E 13 NE 11 E 8
WIND 20FT/LATE(MPH) E 13 NE 11 E 8
MIXING HGT(FT-AGL/MSL)5550 4940
TRANSPORT WND (MPH) E 16 E 8
VENT RATE (KT-FT) 77700 34580
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-170915-
NORTH COASTAL PLAINS-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 40 60 80
TEMP (24H TREND) 90 (0) 74 (-3) 89
RH % (24H TREND) 66 (-4) 100 (+3) 68
WIND 20FT/EARLY(MPH) E 18 E 16 E 11
WIND 20FT/LATE(MPH) E 18 E 16 E 11
MIXING HGT(FT-AGL/MSL)4890 4150
TRANSPORT WND (MPH) E 18 E 8
VENT RATE (KT-FT) 78240 29050
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-170915-
NORTHERN HILLS-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 40 80
TEMP (24H TREND) 89 (+3) 72 (-2) 88
RH % (24H TREND) 67 (-6) 99 (0) 68
WIND 20FT/EARLY(MPH) E 16 E 13 E 9
WIND 20FT/LATE(MPH) E 16 E 13 E 9
MIXING HGT(FT-AGL/MSL)5170 4660
TRANSPORT WND (MPH) E 16 E 7
VENT RATE (KT-FT) 72380 27960
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-170915-
WEST COAST-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 30 80
TEMP (24H TREND) 92 (+2) 73 (-2) 91
RH % (24H TREND) 62 (-6) 99 (+3) 64
WIND 20FT/EARLY(MPH) E 13 E 18 SE 6
WIND 20FT/LATE(MPH) E 13 E 18 SE 6
MIXING HGT(FT-AGL/MSL)4750 4380
TRANSPORT WND (MPH) E 13 SE 6
VENT RATE (KT-FT) 52250 21900
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-170915-
EASTERN INTERIOR-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 80
TEMP (24H TREND) 89 (+4) 72 (-3) 87
RH % (24H TREND) 65 (-10) 100 (+2) 69
WIND 20FT/EARLY(MPH) E 12 E 11 SE 10
WIND 20FT/LATE(MPH) E 12 E 11 SE 10
MIXING HGT(FT-AGL/MSL)5950 5590
TRANSPORT WND (MPH) E 15 SE 8
VENT RATE (KT-FT) 77350 39130
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-170915-
LUQUILLO MOUNTAIN RANGE-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLDY CLOUDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 70 80
TEMP (24H TREND) 85 (+5) 69 (-4) 82
RH % (24H TREND) 70 (-12) 100 (0) 76
WIND 20FT/EARLY(MPH) E 11 NE 9 SE 8
WIND 20FT/LATE(MPH) E 11 NE 9 SE 8
MIXING HGT(FT-AGL/MSL)4420 4080
TRANSPORT WND (MPH) E 16 SE 9
VENT RATE (KT-FT) 61880 32640
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-170915-
CENTRAL MOUNTAIN RANGE-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 20 80
TEMP (24H TREND) 87 (+6) 69 (-3) 85
RH % (24H TREND) 65 (-12) 99 (+2) 69
WIND 20FT/EARLY(MPH) E 10 NE 14 SE 5
WIND 20FT/LATE(MPH) E 10 NE 14 SE 5
MIXING HGT(FT-AGL/MSL)5960 5260
TRANSPORT WND (MPH) E 12 SE 7
VENT RATE (KT-FT) 59600 31560
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-170915-
CAYEY MOUNTAIN RANGE-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 70
TEMP (24H TREND) 85 (+4) 70 (-3) 83
RH % (24H TREND) 68 (-12) 100 (0) 74
WIND 20FT/EARLY(MPH) E 12 NE 9 E 6
WIND 20FT/LATE(MPH) E 12 NE 9 E 6
MIXING HGT(FT-AGL/MSL)5160 5010
TRANSPORT WND (MPH) E 17 SE 9
VENT RATE (KT-FT) 77400 40080
DISPERSION 5 5
DSI 6 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-170915-
VIEQUES-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 50 70
TEMP (24H TREND) 90 (+1) 76 (-2) 89
RH % (24H TREND) 60 (-4) 98 (+2) 62
WIND 20FT/EARLY(MPH) E 14 G19 NE 14 G17 SE 10
WIND 20FT/LATE(MPH) E 14 G19 NE 14 G17 SE 10
MIXING HGT(FT-AGL/MSL)3500 3230
TRANSPORT WND (MPH) E 17 E 12
VENT RATE (KT-FT) 52500 32300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-170915-
CULEBRA-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 70
TEMP (24H TREND) 92 (+2) 77 (-3) 91
RH % (24H TREND) 60 (-7) 98 (+3) 60
WIND 20FT/EARLY(MPH) E 14 G18 E 14 G18 SE 11
WIND 20FT/LATE(MPH) E 14 G18 E 14 G18 SE 11
MIXING HGT(FT-AGL/MSL)3500 3150
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 49000 37800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-170915-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 20 60
TEMP (24H TREND) 93 (+3) 75 (-3) 92
RH % (24H TREND) 53 (-11) 92 (+4) 60
WIND 20FT/EARLY(MPH) E 19 G25 E 14 E 10
WIND 20FT/LATE(MPH) E 19 G25 E 14 E 10
MIXING HGT(FT-AGL/MSL)5020 4640
TRANSPORT WND (MPH) E 16 SE 7
VENT RATE (KT-FT) 70280 27840
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-170915-
SAINT THOMAS AND SAINT JOHN-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 70
TEMP (24H TREND) 88 (+1) 75 (-4) 86
RH % (24H TREND) 67 (-4) 100 (+4) 68
WIND 20FT/EARLY(MPH) E 13 G17 E 13 G17 E 11
WIND 20FT/LATE(MPH) E 13 G17 E 13 G17 E 11
MIXING HGT(FT-AGL/MSL)3510 3200
TRANSPORT WND (MPH) E 17 SE 15
VENT RATE (KT-FT) 52650 41600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-170915-
ST CROIX-
507 AM AST TUE SEP 16 2025
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 40 50 70
TEMP (24H TREND) 90 (+2) 75 (-5) 88
RH % (24H TREND) 64 (-7) 100 (+6) 66
WIND 20FT/EARLY(MPH) E 13 G17 NE 11 E 11
WIND 20FT/LATE(MPH) E 13 G17 NE 11 E 11
MIXING HGT(FT-AGL/MSL)4660 4530
TRANSPORT WND (MPH) E 18 SE 14
VENT RATE (KT-FT) 74560 54360
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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