735
FNCA52 TJSJ 180730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST FRI SEP 18 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-182000-
SOUTHEAST COASTAL PLAINS-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 10
TEMP (24H TREND) 91 (+2) 75 (-3) 91
RH % (24H TREND) 51 (-18) 87 (-4) 59
WIND 20FT/EARLY(MPH) E 13 E 11 E 11
WIND 20FT/LATE(MPH) SE 13 NE 9 SE 14
MIXING HGT(FT-AGL/MSL)5070 4790
TRANSPORT WND (MPH) E 14 E 12
VENT RATE (KT-FT) 60840 47900
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-182000-
SOUTHERN HILLS-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 30
TEMP (24H TREND) 89 (+4) 72 (-3) 89
RH % (24H TREND) 57 (-15) 94 (0) 63
WIND 20FT/EARLY(MPH) E 11 E 9 E 9
WIND 20FT/LATE(MPH) SE 11 E 9 SE 11
MIXING HGT(FT-AGL/MSL)5660 5530
TRANSPORT WND (MPH) E 13 E 9
VENT RATE (KT-FT) 62260 44240
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-182000-
NORTH COASTAL PLAINS-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 91 (0) 75 (-3) 92
RH % (24H TREND) 60 (-5) 95 (0) 62
WIND 20FT/EARLY(MPH) E 11 E 14 E 10
WIND 20FT/LATE(MPH) E 18 SE 9 E 16
MIXING HGT(FT-AGL/MSL)4980 4860
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 54780 43740
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-182000-
NORTHERN HILLS-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 20 50
TEMP (24H TREND) 91 (+2) 72 (-3) 91
RH % (24H TREND) 57 (-8) 96 (-2) 63
WIND 20FT/EARLY(MPH) E 10 E 12 E 9
WIND 20FT/LATE(MPH) E 14 SE 6 NE 13
MIXING HGT(FT-AGL/MSL)6080 5470
TRANSPORT WND (MPH) E 9 E 7
VENT RATE (KT-FT) 48640 32820
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-182000-
WEST COAST-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 40 60
TEMP (24H TREND) 92 (0) 73 (-3) 94
RH % (24H TREND) 59 (-7) 96 (+1) 61
WIND 20FT/EARLY(MPH) E 13 E 11 E 10
WIND 20FT/LATE(MPH) E 13 E 9 E 11
MIXING HGT(FT-AGL/MSL)4950 4770
TRANSPORT WND (MPH) E 12 E 7
VENT RATE (KT-FT) 49500 28620
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-182000-
EASTERN INTERIOR-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 50 50
TEMP (24H TREND) 90 (+3) 73 (-4) 90
RH % (24H TREND) 58 (-12) 95 (0) 61
WIND 20FT/EARLY(MPH) E 11 E 11 E 9
WIND 20FT/LATE(MPH) E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL)6110 6630
TRANSPORT WND (MPH) E 13 E 9
VENT RATE (KT-FT) 67210 53040
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-182000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 60 40
TEMP (24H TREND) 85 (+3) 71 (-4) 86
RH % (24H TREND) 65 (-12) 97 (0) 65
WIND 20FT/EARLY(MPH) E 10 E 8 E 9
WIND 20FT/LATE(MPH) E 10 E 8 E 10
MIXING HGT(FT-AGL/MSL)4350 4420
TRANSPORT WND (MPH) E 12 E 10
VENT RATE (KT-FT) 43500 39780
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-182000-
CENTRAL MOUNTAIN RANGE-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 40 70
TEMP (24H TREND) 88 (+5) 69 (-4) 88
RH % (24H TREND) 59 (-15) 96 (0) 65
WIND 20FT/EARLY(MPH) E 9 E 8 E 6
WIND 20FT/LATE(MPH) SE 9 E 5 E 8
MIXING HGT(FT-AGL/MSL)7030 6190
TRANSPORT WND (MPH) E 8 E 6
VENT RATE (KT-FT) 49210 30950
DISPERSION 5 5
DSI 6 1 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-182000-
CAYEY MOUNTAIN RANGE-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 20
TEMP (24H TREND) 85 (+3) 72 (-2) 86
RH % (24H TREND) 65 (-12) 97 (-1) 67
WIND 20FT/EARLY(MPH) E 9 E 8 E 8
WIND 20FT/LATE(MPH) E 10 E 8 E 10
MIXING HGT(FT-AGL/MSL)5040 5250
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 55440 47250
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-182000-
VIEQUES-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 40
TEMP (24H TREND) 91 (+1) 78 (-3) 90
RH % (24H TREND) 57 (-6) 86 (+1) 57
WIND 20FT/EARLY(MPH) E 13 E 13 E 10
WIND 20FT/LATE(MPH) E 12 E 13 E 10
MIXING HGT(FT-AGL/MSL)3260 3110
TRANSPORT WND (MPH) E 16 E 10
VENT RATE (KT-FT) 45640 27990
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-182000-
CULEBRA-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 90 (+1) 79 (-3) 91
RH % (24H TREND) 61 (-7) 87 (+2) 58
WIND 20FT/EARLY(MPH) E 13 E 12 E 10
WIND 20FT/LATE(MPH) E 12 E 12 E 10
MIXING HGT(FT-AGL/MSL)3190 3170
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 38280 34870
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-182000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 20
TEMP (24H TREND) 92 (+1) 75 (-3) 93
RH % (24H TREND) 52 (-12) 88 (-1) 56
WIND 20FT/EARLY(MPH) E 18 E 13 E 13
WIND 20FT/LATE(MPH) SE 19 E 13 SE 16
MIXING HGT(FT-AGL/MSL)4650 4820
TRANSPORT WND (MPH) E 18 E 13
VENT RATE (KT-FT) 74400 53020
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-182000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 89 (+2) 77 (-4) 88
RH % (24H TREND) 61 (-9) 89 (+3) 61
WIND 20FT/EARLY(MPH) E 13 E 13 E 11
WIND 20FT/LATE(MPH) E 11 E 13 E 9
MIXING HGT(FT-AGL/MSL)3210 3060
TRANSPORT WND (MPH) E 14 E 10
VENT RATE (KT-FT) 38520 27540
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-182000-
ST CROIX-
330 AM AST FRI SEP 18 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 40
TEMP (24H TREND) 91 (+3) 78 (-3) 89
RH % (24H TREND) 59 (-11) 89 (+1) 63
WIND 20FT/EARLY(MPH) E 14 E 13 E 10
WIND 20FT/LATE(MPH) E 12 E 12 E 10
MIXING HGT(FT-AGL/MSL)4620 4380
TRANSPORT WND (MPH) E 15 E 12
VENT RATE (KT-FT) 60060 43800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page