035
FNCA52 TJSJ 180804
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
404 AM AST THU SEP 18 2025
DISCUSSION
THE RISK OF SPREADING FIRES REMAIN LOW AGAIN FOR TODAS MOISTURE
ASSOCIATED WITH A DEPARTING TROPICAL WAVE COMBINED WITH AN UPPER-
LEVEL TROUGH, WILL MAINTAIN THE FREQUENCY OF SHOWERS AND THUNDERSTORMS
ACROSS THE REGION. WINDS WILL BE FROM E-SE AT AROUND 10 TO 12 MPH
OR LESS. MINIMUM RELATIVE HUMIDITIES ARE EXPECTED TO REMAIN ABOVE
THE FIRE WEATHER CRITICAL THRESHOLD.
PRZ014-190815-
SOUTHEAST COASTAL PLAINS-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 50 50
TEMP (24H TREND) 90 (+2) 74 (-2) 90
RH % (24H TREND) 63 (-5) 94 (+1) 60
WIND 20FT/EARLY(MPH) SE 8 E 8 SE 10
WIND 20FT/LATE(MPH) SE 8 E 8 SE 10
MIXING HGT(FT-AGL/MSL)3230 4460
TRANSPORT WND (MPH) E 8 SE 10
VENT RATE (KT-FT) 22610 40140
DISPERSION 5 5
DSI 5 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-190815-
SOUTHERN HILLS-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 20 60
TEMP (24H TREND) 86 (+3) 70 (-3) 88
RH % (24H TREND) 66 (-7) 98 (+3) 63
WIND 20FT/EARLY(MPH) SE 8 E 6 SE 8
WIND 20FT/LATE(MPH) SE 8 E 6 SE 8
MIXING HGT(FT-AGL/MSL)4270 4700
TRANSPORT WND (MPH) E 8 SE 9
VENT RATE (KT-FT) 29890 37600
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-190815-
NORTH COASTAL PLAINS-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 80 40 80
TEMP (24H TREND) 90 (+2) 74 (-2) 91
RH % (24H TREND) 65 (-6) 97 (+2) 63
WIND 20FT/EARLY(MPH) E 11 SE 8 E 10
WIND 20FT/LATE(MPH) E 11 SE 8 E 10
MIXING HGT(FT-AGL/MSL)3960 4530
TRANSPORT WND (MPH) SE 9 SE 6
VENT RATE (KT-FT) 31680 22650
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-190815-
NORTHERN HILLS-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 10 90
TEMP (24H TREND) 88 (+2) 72 (-2) 90
RH % (24H TREND) 66 (-6) 97 (+1) 65
WIND 20FT/EARLY(MPH) E 10 SE 5 NE 6
WIND 20FT/LATE(MPH) E 10 SE 5 NE 6
MIXING HGT(FT-AGL/MSL)4760 4470
TRANSPORT WND (MPH) SE 7 SE 6
VENT RATE (KT-FT) 28560 22350
DISPERSION 5 5
DSI 5 2 4
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-190815-
WEST COAST-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 10 60
TEMP (24H TREND) 90 (+1) 72 (-3) 91
RH % (24H TREND) 64 (-6) 99 (+4) 63
WIND 20FT/EARLY(MPH) SE 9 E 8 SE 10
WIND 20FT/LATE(MPH) SE 9 E 8 SE 10
MIXING HGT(FT-AGL/MSL)4170 3130
TRANSPORT WND (MPH) SE 7 SE 12
VENT RATE (KT-FT) 25020 31300
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-190815-
EASTERN INTERIOR-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 60 70
TEMP (24H TREND) 87 (+2) 72 (-1) 90
RH % (24H TREND) 68 (-5) 100 (+1) 63
WIND 20FT/EARLY(MPH) SE 9 SE 9 SE 9
WIND 20FT/LATE(MPH) SE 9 SE 9 SE 9
MIXING HGT(FT-AGL/MSL)2650 5040
TRANSPORT WND (MPH) SE 8 SE 9
VENT RATE (KT-FT) 18550 40320
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-190815-
LUQUILLO MOUNTAIN RANGE-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 82 (+3) 69 (-1) 86
RH % (24H TREND) 72 (-9) 100 (0) 66
WIND 20FT/EARLY(MPH) SE 6 SE 6 SE 8
WIND 20FT/LATE(MPH) SE 6 SE 6 SE 8
MIXING HGT(FT-AGL/MSL)2220 3770
TRANSPORT WND (MPH) SE 9 SE 9
VENT RATE (KT-FT) 17760 30160
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-190815-
CENTRAL MOUNTAIN RANGE-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 0 90
TEMP (24H TREND) 85 (+4) 69 (-3) 86
RH % (24H TREND) 67 (-9) 99 (+4) 67
WIND 20FT/EARLY(MPH) SE 5 LGT/VAR SE 8
WIND 20FT/LATE(MPH) SE 5 LGT/VAR SE 8
MIXING HGT(FT-AGL/MSL)5070 4660
TRANSPORT WND (MPH) SE 6 SE 8
VENT RATE (KT-FT) 25350 32620
DISPERSION 5 5
DSI 5 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-190815-
CAYEY MOUNTAIN RANGE-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 60 60
TEMP (24H TREND) 83 (+2) 69 (-2) 85
RH % (24H TREND) 73 (-4) 100 (0) 67
WIND 20FT/EARLY(MPH) SE 6 E 5 SE 8
WIND 20FT/LATE(MPH) SE 6 E 5 SE 8
MIXING HGT(FT-AGL/MSL)2940 4520
TRANSPORT WND (MPH) SE 9 SE 9
VENT RATE (KT-FT) 23520 36160
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-190815-
VIEQUES-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 89 (+2) 74 (0) 90
RH % (24H TREND) 58 (-9) 99 (-1) 57
WIND 20FT/EARLY(MPH) SE 11 E 11 SE 6
WIND 20FT/LATE(MPH) SE 11 E 11 SE 6
MIXING HGT(FT-AGL/MSL)3450 3070
TRANSPORT WND (MPH) SE 13 SE 9
VENT RATE (KT-FT) 37950 24560
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-190815-
CULEBRA-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 91 (+2) 74 (-2) 92
RH % (24H TREND) 57 (-11) 100 (+1) 55
WIND 20FT/EARLY(MPH) SE 11 E 11 SE 8
WIND 20FT/LATE(MPH) SE 11 E 11 SE 8
MIXING HGT(FT-AGL/MSL)3290 3330
TRANSPORT WND (MPH) SE 13 SE 13
VENT RATE (KT-FT) 36190 36630
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-190815-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30
TEMP (24H TREND) 92 (+2) 75 (-2) 92
RH % (24H TREND) 59 (-6) 93 (+4) 58
WIND 20FT/EARLY(MPH) SE 12 E 11 SE 12
WIND 20FT/LATE(MPH) SE 12 E 11 SE 12
MIXING HGT(FT-AGL/MSL)4220 4060
TRANSPORT WND (MPH) SE 10 SE 10
VENT RATE (KT-FT) 37980 36540
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-190815-
SAINT THOMAS AND SAINT JOHN-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 50 60
TEMP (24H TREND) 87 (+2) 72 (-5) 88
RH % (24H TREND) 63 (-8) 100 (+5) 62
WIND 20FT/EARLY(MPH) SE 12 E 11 SE 9
WIND 20FT/LATE(MPH) SE 12 E 11 SE 9
MIXING HGT(FT-AGL/MSL)2550 3340
TRANSPORT WND (MPH) E 15 SE 13
VENT RATE (KT-FT) 33150 36740
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-190815-
ST CROIX-
404 AM AST THU SEP 18 2025
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 70 50 40
TEMP (24H TREND) 88 (+2) 77 (-2) 90
RH % (24H TREND) 64 (-8) 93 (0) 62
WIND 20FT/EARLY(MPH) SE 9 E 10 SE 9
WIND 20FT/LATE(MPH) SE 9 E 10 SE 9
MIXING HGT(FT-AGL/MSL)3800 4620
TRANSPORT WND (MPH) SE 10 SE 10
VENT RATE (KT-FT) 34200 41580
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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