254
FNCA52 TJSJ 280749 AAA
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO...UPDATED
NATIONAL WEATHER SERVICE SAN JUAN PR
349 AM AST FRI AUG 28 2026
DISCUSSION
A GENERALLY STABLE PATTERN WILL PREVAIL TODAY UNDER A MID-LEVEL
RIDGE. ALTHOUGH DRY FUELS REMAIN ACROSS PORTIONS OF THE ISLANDS
DUE TO THE ONGOING RAINFALL DEFICITS, PATCHES OF TRADE-WIND
MOISTURE WILL MAINTAIN RELATIVE HUMIDITY ABOVE CRITICAL
THRESHOLDS. EAST TO EAST-SOUTHEAST WINDS AROUND 10-15 MPH ARE
EXPECTED, WITH LOCALLY HIGHER GUSTS. AFTERNOON SHOWERS AND
ISOLATED THUNDERSTORMS WILL FAVOR THE INTERIOR AND WESTERN
PORTIONS OF PUERTO RICO, PROVIDING LOCALIZED WETTING RAINFALL.
THEREFORE, CRITICAL FIRE-WEATHER CONDITIONS ARE NOT ANTICIPATED
TODAY.
PRZ014-282015-
SOUTHEAST COASTAL PLAINS-
349 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.
PRZ015-282015-
SOUTHERN HILLS-
349 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.
PRZ016-282015-
NORTH COASTAL PLAINS-
349 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.
PRZ017-282015-
NORTHERN HILLS-
349 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.
PRZ018-282015-
WEST COAST-
349 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.
PRZ019-282015-
EASTERN INTERIOR-
349 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.
PRZ022-282015-
LUQUILLO MOUNTAIN RANGE-
349 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.
PRZ023-282015-
CENTRAL MOUNTAIN RANGE-
349 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.
PRZ024-282015-
CAYEY MOUNTAIN RANGE-
349 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.
PRZ025-282015-
VIEQUES-
349 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.
PRZ026-282015-
CULEBRA-
349 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.
PRZ027-282015-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
349 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.
VIZ001-282015-
SAINT THOMAS AND SAINT JOHN-
349 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.
VIZ002-282015-
ST CROIX-
349 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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page