770
FNCA52 TJSJ 280730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST FRI AUG 28 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-282000-
SOUTHEAST COASTAL PLAINS-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 20
TEMP (24H TREND) 93 (0) 76 (-2) 93
RH % (24H TREND) 49 (-2) 90 (+7) 49
WIND 20FT/EARLY(MPH) E 18 E 14 E 16
WIND 20FT/LATE(MPH) E 19 G26 E 12 E 17
MIXING HGT(FT-AGL/MSL)5410 5180
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 86560 88060
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-282000-
SOUTHERN HILLS-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30
TEMP (24H TREND) 91 (+3) 72 (-3) 91
RH % (24H TREND) 58 (-3) 98 (+8) 53
WIND 20FT/EARLY(MPH) E 14 E 12 E 13
WIND 20FT/LATE(MPH) E 14 E 12 E 13
MIXING HGT(FT-AGL/MSL)6250 5770
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 93750 92320
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-282000-
NORTH COASTAL PLAINS-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 30 50 20
TEMP (24H TREND) 92 (+1) 75 (-3) 93
RH % (24H TREND) 59 (-6) 97 (+5) 52
WIND 20FT/EARLY(MPH) E 16 E 16 E 13
WIND 20FT/LATE(MPH) E 19 E 11 E 20
MIXING HGT(FT-AGL/MSL)4990 5410
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 84830 91970
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-282000-
NORTHERN HILLS-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 20
TEMP (24H TREND) 91 (+2) 73 (-1) 91
RH % (24H TREND) 63 (-4) 98 (+2) 54
WIND 20FT/EARLY(MPH) E 13 E 14 E 12
WIND 20FT/LATE(MPH) E 17 E 8 E 18
MIXING HGT(FT-AGL/MSL)5760 6540
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 80640 85020
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-282000-
WEST COAST-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 30 40
TEMP (24H TREND) 94 (+1) 73 (-2) 94
RH % (24H TREND) 58 (-6) 97 (+2) 53
WIND 20FT/EARLY(MPH) E 11 E 13 E 14
WIND 20FT/LATE(MPH) SE 13 E 8 E 14
MIXING HGT(FT-AGL/MSL)5300 4780
TRANSPORT WND (MPH) E 9 E 13
VENT RATE (KT-FT) 42400 52580
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-282000-
EASTERN INTERIOR-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 50 60 20
TEMP (24H TREND) 91 (+1) 74 (-3) 92
RH % (24H TREND) 58 (-2) 98 (+7) 53
WIND 20FT/EARLY(MPH) E 14 E 13 E 13
WIND 20FT/LATE(MPH) E 14 E 14 E 13
MIXING HGT(FT-AGL/MSL)6050 6070
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 96800 103190
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-282000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 50 60 50
TEMP (24H TREND) 87 (+3) 71 (-3) 88
RH % (24H TREND) 64 (-5) 100 (+6) 61
WIND 20FT/EARLY(MPH) E 13 E 11 E 12
WIND 20FT/LATE(MPH) E 13 E 11 E 12
MIXING HGT(FT-AGL/MSL)4290 4740
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 72930 85320
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-282000-
CENTRAL MOUNTAIN RANGE-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 20 50
TEMP (24H TREND) 88 (+3) 69 (-3) 89
RH % (24H TREND) 65 (-6) 99 (+3) 54
WIND 20FT/EARLY(MPH) E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 11 E 6 E 11
MIXING HGT(FT-AGL/MSL)6670 7270
TRANSPORT WND (MPH) E 14 E 12
VENT RATE (KT-FT) 80040 72700
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-282000-
CAYEY MOUNTAIN RANGE-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 50 60 20
TEMP (24H TREND) 87 (+1) 72 (-2) 87
RH % (24H TREND) 63 (0) 100 (+5) 59
WIND 20FT/EARLY(MPH) E 13 E 10 E 12
WIND 20FT/LATE(MPH) E 13 E 10 E 12
MIXING HGT(FT-AGL/MSL)5050 5350
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 85850 96300
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-282000-
VIEQUES-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 50 50 20
TEMP (24H TREND) 91 (+1) 80 (-1) 92
RH % (24H TREND) 56 (-4) 86 (+5) 55
WIND 20FT/EARLY(MPH) E 17 E 17 E 18
WIND 20FT/LATE(MPH) E 17 E 19 E 16
MIXING HGT(FT-AGL/MSL)3710 3560
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 63070 71200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-282000-
CULEBRA-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 20
TEMP (24H TREND) 92 (+2) 80 (-2) 92
RH % (24H TREND) 59 (-6) 90 (+6) 55
WIND 20FT/EARLY(MPH) E 17 E 17 E 18
WIND 20FT/LATE(MPH) E 17 E 19 E 16
MIXING HGT(FT-AGL/MSL)3500 3530
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 66500 70600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-282000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 20
TEMP (24H TREND) 94 (+2) 76 (-1) 94
RH % (24H TREND) 50 (-4) 86 (+1) 52
WIND 20FT/EARLY(MPH) E 16 E 18 E 19
WIND 20FT/LATE(MPH) E 18 E 14 SE 20
MIXING HGT(FT-AGL/MSL)5770 5190
TRANSPORT WND (MPH) E 14 E 22
VENT RATE (KT-FT) 69240 98610
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-282000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 10
TEMP (24H TREND) 90 (+3) 79 (-2) 90
RH % (24H TREND) 59 (-6) 92 (+8) 57
WIND 20FT/EARLY(MPH) E 18 E 18 E 18
WIND 20FT/LATE(MPH) E 18 E 19 E 16
MIXING HGT(FT-AGL/MSL)3460 3430
TRANSPORT WND (MPH) E 23 E 25
VENT RATE (KT-FT) 69200 75460
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-282000-
ST CROIX-
330 AM AST FRI AUG 28 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 10
TEMP (24H TREND) 91 (+2) 80 (-1) 91
RH % (24H TREND) 61 (-4) 90 (+5) 57
WIND 20FT/EARLY(MPH) E 17 E 16 E 18
WIND 20FT/LATE(MPH) E 16 E 17 E 16
MIXING HGT(FT-AGL/MSL)4700 4680
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 84600 88920
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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