584
FNCA52 TJSJ 170712
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
312 AM AST WED SEP 17 2025
DISCUSSION
A TROPICAL WAVE COMBINED WITH AN UPPER-LEVEL TROUGH, WILL
INCREASE THE FREQUENCY OF SHOWERS AND THUNDERSTORMS PARTICULARLY
TODAY AND THURSDAY. WINDS WILL BE VEERING FROM NE TO E-SE AT 15-20
MPH TODAY. MINIMUM RELATIVE HUMIDITIES ARE EXPECTED TO REMAIN
ABOVE THE FIRE WEATHER CRITICAL THRESHOLD. AS A RESULT, THE RISK
OF SPREADING FIRES SHOULD BE MAINLY LOW AGAIN FOR TODAY.
PRZ014-180715-
SOUTHEAST COASTAL PLAINS-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 80 60
TEMP (24H TREND) 90 (0) 73 (-3) 89
RH % (24H TREND) 62 (+4) 98 (+7) 64
WIND 20FT/EARLY(MPH) SE 14 G19 E 12 SE 12
WIND 20FT/LATE(MPH) SE 14 G19 E 12 SE 12
MIXING HGT(FT-AGL/MSL)3730 3500
TRANSPORT WND (MPH) E 12 SE 13
VENT RATE (KT-FT) 37300 38500
DISPERSION 5 5
DSI 5 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-180715-
SOUTHERN HILLS-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 60
TEMP (24H TREND) 86 (+1) 70 (-4) 85
RH % (24H TREND) 67 (-1) 100 (+6) 68
WIND 20FT/EARLY(MPH) SE 11 E 12 SE 9
WIND 20FT/LATE(MPH) SE 11 E 12 SE 9
MIXING HGT(FT-AGL/MSL)4140 3720
TRANSPORT WND (MPH) E 12 SE 10
VENT RATE (KT-FT) 41400 33480
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-180715-
NORTH COASTAL PLAINS-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 60 80
TEMP (24H TREND) 89 (0) 73 (-3) 89
RH % (24H TREND) 67 (-3) 99 (+2) 66
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)4310 3930
TRANSPORT WND (MPH) E 12 SE 7
VENT RATE (KT-FT) 43100 23580
DISPERSION 5 5
DSI 6 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-180715-
NORTHERN HILLS-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 20 90
TEMP (24H TREND) 88 (0) 71 (-3) 88
RH % (24H TREND) 69 (-1) 99 (0) 68
WIND 20FT/EARLY(MPH) E 11 E 11 E 8
WIND 20FT/LATE(MPH) E 11 E 11 E 8
MIXING HGT(FT-AGL/MSL)4180 3590
TRANSPORT WND (MPH) SE 7 SE 5
VENT RATE (KT-FT) 25080 14360
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-180715-
WEST COAST-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 90 30 60
TEMP (24H TREND) 90 (-1) 72 (-2) 90
RH % (24H TREND) 66 (-1) 99 (+2) 66
WIND 20FT/EARLY(MPH) SE 10 E 13 SE 12
WIND 20FT/LATE(MPH) SE 10 E 13 SE 12
MIXING HGT(FT-AGL/MSL)4170 2610
TRANSPORT WND (MPH) E 10 SE 10
VENT RATE (KT-FT) 37530 23490
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-180715-
EASTERN INTERIOR-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER CLOUDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 70
TEMP (24H TREND) 87 (0) 71 (-3) 87
RH % (24H TREND) 69 (0) 100 (+1) 69
WIND 20FT/EARLY(MPH) SE 12 E 13 SE 11
WIND 20FT/LATE(MPH) SE 12 E 13 SE 11
MIXING HGT(FT-AGL/MSL)4530 4320
TRANSPORT WND (MPH) E 14 SE 12
VENT RATE (KT-FT) 54360 43200
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-180715-
LUQUILLO MOUNTAIN RANGE-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER CLOUDY CLOUDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 80
TEMP (24H TREND) 82 (+1) 69 (-3) 82
RH % (24H TREND) 74 (-4) 100 (0) 74
WIND 20FT/EARLY(MPH) SE 11 E 10 SE 10
WIND 20FT/LATE(MPH) SE 11 E 10 SE 10
MIXING HGT(FT-AGL/MSL)3910 4080
TRANSPORT WND (MPH) E 14 SE 13
VENT RATE (KT-FT) 46920 44880
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-180715-
CENTRAL MOUNTAIN RANGE-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 90 40 80
TEMP (24H TREND) 85 (+2) 68 (-4) 85
RH % (24H TREND) 69 (-3) 99 (0) 69
WIND 20FT/EARLY(MPH) SE 6 E 8 SE 6
WIND 20FT/LATE(MPH) SE 6 E 8 SE 6
MIXING HGT(FT-AGL/MSL)4320 3590
TRANSPORT WND (MPH) SE 9 SE 8
VENT RATE (KT-FT) 34560 25130
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-180715-
CAYEY MOUNTAIN RANGE-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER CLOUDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 80 70
TEMP (24H TREND) 83 (0) 69 (-3) 82
RH % (24H TREND) 72 (-1) 100 (0) 73
WIND 20FT/EARLY(MPH) SE 10 E 10 SE 9
WIND 20FT/LATE(MPH) SE 10 E 10 SE 9
MIXING HGT(FT-AGL/MSL)4190 4180
TRANSPORT WND (MPH) E 15 SE 13
VENT RATE (KT-FT) 54470 45980
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-180715-
VIEQUES-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 80
TEMP (24H TREND) 88 (-1) 75 (-1) 89
RH % (24H TREND) 63 (-1) 99 (+1) 61
WIND 20FT/EARLY(MPH) SE 14 G18 E 18 G22 SE 11
WIND 20FT/LATE(MPH) SE 14 G18 E 18 G22 SE 11
MIXING HGT(FT-AGL/MSL)3150 3200
TRANSPORT WND (MPH) E 17 SE 15
VENT RATE (KT-FT) 47250 41600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-180715-
CULEBRA-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 80
TEMP (24H TREND) 91 (+1) 76 (-2) 91
RH % (24H TREND) 60 (-7) 99 (+1) 59
WIND 20FT/EARLY(MPH) E 17 G21 E 18 G23 SE 11
WIND 20FT/LATE(MPH) E 17 G21 E 18 G23 SE 11
MIXING HGT(FT-AGL/MSL)3130 3330
TRANSPORT WND (MPH) E 21 SE 14
VENT RATE (KT-FT) 56340 39960
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-180715-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 50 50
TEMP (24H TREND) 92 (+1) 74 (-3) 91
RH % (24H TREND) 61 (+3) 95 (+6) 61
WIND 20FT/EARLY(MPH) E 13 G17 E 17 G20 SE 14 G19
WIND 20FT/LATE(MPH) E 13 G17 E 17 G20 SE 14 G19
MIXING HGT(FT-AGL/MSL)3980 3350
TRANSPORT WND (MPH) E 9 SE 12
VENT RATE (KT-FT) 31840 33500
DISPERSION 5 5
DSI 5 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-180715-
SAINT THOMAS AND SAINT JOHN-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 60 60
TEMP (24H TREND) 86 (0) 75 (-3) 87
RH % (24H TREND) 67 (-5) 98 (+2) 64
WIND 20FT/EARLY(MPH) E 19 G23 E 19 G23 E 11
WIND 20FT/LATE(MPH) E 19 G23 E 19 G23 E 11
MIXING HGT(FT-AGL/MSL)3240 3320
TRANSPORT WND (MPH) E 22 SE 16
VENT RATE (KT-FT) 61560 46480
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-180715-
ST CROIX-
312 AM AST WED SEP 17 2025
TODAY TONIGHT THU
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 60
TEMP (24H TREND) 87 (-1) 75 (-3) 88
RH % (24H TREND) 68 (-1) 99 (+3) 66
WIND 20FT/EARLY(MPH) SE 16 G19 E 17 G20 E 12
WIND 20FT/LATE(MPH) SE 16 G19 E 17 G20 E 12
MIXING HGT(FT-AGL/MSL)3490 3950
TRANSPORT WND (MPH) E 16 SE 15
VENT RATE (KT-FT) 48860 51350
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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