490
FNCA52 TJSJ 130657
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
257 AM AST SAT SEP 13 2025
DISCUSSION
AN AREA OF ENHANCED MOISTURE WILL APPROACH THE ISLANDS TODAY,
MAINTAINING RELATIVE HUMIDITIES AT 60% OR MORE. WINDS WILL BE FROM
THE SOUTHEAST BELOW 15 MPH. THEREFORE, THE RISK OF SPREADING FIRES
IS LOW FOR TODAY.
PRZ014-140700-
SOUTHEAST COASTAL PLAINS-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 10 60
TEMP (24H TREND) 91 (+1) 74 (-2) 91
RH % (24H TREND) 61 (-2) 95 (+4) 60
WIND 20FT/EARLY(MPH) SE 13 G19 E 11 E 14 G20
WIND 20FT/LATE(MPH) SE 13 G19 E 11 E 14 G20
MIXING HGT(FT-AGL/MSL)4610 4020
TRANSPORT WND (MPH) E 9 E 16
VENT RATE (KT-FT) 36880 56280
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-140700-
SOUTHERN HILLS-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 0 60
TEMP (24H TREND) 88 (+2) 71 (-2) 88
RH % (24H TREND) 62 (-5) 99 (+6) 63
WIND 20FT/EARLY(MPH) SE 11 E 10 SE 12
WIND 20FT/LATE(MPH) SE 11 E 10 SE 12
MIXING HGT(FT-AGL/MSL)5180 4760
TRANSPORT WND (MPH) E 8 E 15
VENT RATE (KT-FT) 36260 61880
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-140700-
NORTH COASTAL PLAINS-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 20 60
TEMP (24H TREND) 90 (-1) 74 (-2) 91
RH % (24H TREND) 64 (-1) 99 (+4) 65
WIND 20FT/EARLY(MPH) E 11 SE 10 E 14
WIND 20FT/LATE(MPH) E 11 SE 10 E 14
MIXING HGT(FT-AGL/MSL)4700 4310
TRANSPORT WND (MPH) E 7 SE 15
VENT RATE (KT-FT) 28200 56030
DISPERSION 5 5
DSI 5 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-140700-
NORTHERN HILLS-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY CLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 0 60
TEMP (24H TREND) 89 (0) 71 (-2) 91
RH % (24H TREND) 64 (-2) 99 (+1) 63
WIND 20FT/EARLY(MPH) E 9 SE 8 E 11
WIND 20FT/LATE(MPH) E 9 SE 8 E 11
MIXING HGT(FT-AGL/MSL)5190 4740
TRANSPORT WND (MPH) E 5 SE 13
VENT RATE (KT-FT) 20760 52140
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-140700-
WEST COAST-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 60 0 60
TEMP (24H TREND) 92 (+1) 73 (-1) 93
RH % (24H TREND) 61 (-4) 99 (+4) 60
WIND 20FT/EARLY(MPH) E 10 E 10 E 13
WIND 20FT/LATE(MPH) E 10 E 10 E 13
MIXING HGT(FT-AGL/MSL)4530 4310
TRANSPORT WND (MPH) E 5 SE 10
VENT RATE (KT-FT) 18120 38790
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-140700-
EASTERN INTERIOR-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 50 20 70
TEMP (24H TREND) 89 (+1) 72 (-2) 89
RH % (24H TREND) 64 (0) 100 (+4) 67
WIND 20FT/EARLY(MPH) E 10 SE 11 E 14
WIND 20FT/LATE(MPH) E 10 SE 11 E 14
MIXING HGT(FT-AGL/MSL)5550 3540
TRANSPORT WND (MPH) E 8 SE 16
VENT RATE (KT-FT) 38850 49560
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-140700-
LUQUILLO MOUNTAIN RANGE-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 40 40 70
TEMP (24H TREND) 85 (+3) 69 (-3) 84
RH % (24H TREND) 69 (-2) 100 (+1) 73
WIND 20FT/EARLY(MPH) SE 10 E 9 E 12
WIND 20FT/LATE(MPH) SE 10 E 9 E 12
MIXING HGT(FT-AGL/MSL)4210 2780
TRANSPORT WND (MPH) E 10 SE 18
VENT RATE (KT-FT) 37890 44480
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-140700-
CENTRAL MOUNTAIN RANGE-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY CLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 70 0 70
TEMP (24H TREND) 87 (+4) 69 (-2) 89
RH % (24H TREND) 65 (-5) 99 (+3) 64
WIND 20FT/EARLY(MPH) SE 6 E 5 SE 9
WIND 20FT/LATE(MPH) SE 6 E 5 SE 9
MIXING HGT(FT-AGL/MSL)5710 5080
TRANSPORT WND (MPH) E 5 E 13
VENT RATE (KT-FT) 22840 55880
DISPERSION 5 5
DSI 5 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-140700-
CAYEY MOUNTAIN RANGE-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 70
TEMP (24H TREND) 85 (+1) 70 (-2) 84
RH % (24H TREND) 67 (-1) 100 (+1) 72
WIND 20FT/EARLY(MPH) E 9 E 9 E 11
WIND 20FT/LATE(MPH) E 9 E 9 E 11
MIXING HGT(FT-AGL/MSL)5190 2610
TRANSPORT WND (MPH) E 10 SE 16
VENT RATE (KT-FT) 46710 36540
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-140700-
VIEQUES-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 40 50 70
TEMP (24H TREND) 89 (-1) 76 (-2) 89
RH % (24H TREND) 58 (-1) 98 (+6) 62
WIND 20FT/EARLY(MPH) E 12 E 13 G17 E 17 G21
WIND 20FT/LATE(MPH) E 12 E 13 G17 E 17 G21
MIXING HGT(FT-AGL/MSL)3430 3400
TRANSPORT WND (MPH) E 14 SE 22
VENT RATE (KT-FT) 41160 64600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-140700-
CULEBRA-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 40 50 70
TEMP (24H TREND) 91 (+1) 77 (-2) 91
RH % (24H TREND) 58 (-3) 97 (+7) 61
WIND 20FT/EARLY(MPH) E 12 E 13 G17 E 17 G21
WIND 20FT/LATE(MPH) E 12 E 13 G17 E 17 G21
MIXING HGT(FT-AGL/MSL)3370 3400
TRANSPORT WND (MPH) E 14 E 22
VENT RATE (KT-FT) 40440 64600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-140700-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 20
TEMP (24H TREND) 93 (+2) 75 (-2) 94
RH % (24H TREND) 55 (-6) 92 (+5) 56
WIND 20FT/EARLY(MPH) SE 13 G18 E 13 G17 SE 19 G23
WIND 20FT/LATE(MPH) SE 13 G18 E 13 G17 SE 19 G23
MIXING HGT(FT-AGL/MSL)4610 4580
TRANSPORT WND (MPH) E 9 E 17
VENT RATE (KT-FT) 36880 68700
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-140700-
SAINT THOMAS AND SAINT JOHN-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 40 50 60
TEMP (24H TREND) 87 (0) 75 (-3) 87
RH % (24H TREND) 64 (-2) 100 (+7) 69
WIND 20FT/EARLY(MPH) E 12 E 14 G19 E 17 G21
WIND 20FT/LATE(MPH) E 12 E 14 G19 E 17 G21
MIXING HGT(FT-AGL/MSL)3280 3250
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 42640 58500
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-140700-
ST CROIX-
257 AM AST SAT SEP 13 2025
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 30 50 50
TEMP (24H TREND) 90 (+1) 77 (-2) 91
RH % (24H TREND) 62 (-3) 94 (+2) 63
WIND 20FT/EARLY(MPH) E 12 E 14 G17 E 16 G19
WIND 20FT/LATE(MPH) E 12 E 14 G17 E 16 G19
MIXING HGT(FT-AGL/MSL)4270 3710
TRANSPORT WND (MPH) E 14 E 22
VENT RATE (KT-FT) 51240 70490
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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