Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
131
FNCA52 TJSJ 170839
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
439 AM AST Fri Oct 17 2025
.DISCUSSION...
Once again, LOW fire weather threat across the vulnerable areas.
During the overnight hours showers and thunderstorms filtered
across the southern coastal areas increasing moisture/rainfall
activity. We anticipate additional rainfall activity across the
area, today.
PRZ014-180845-
Southeast Coastal Plains-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 40 50
Temp (24h trend) 89 (+3) 73 (-3) 89
RH % (24h trend) 59 (-13) 93 (+1) 59
Wind 20ft/early(mph) SW 12 G17 NW 6 S 8
Wind 20ft/late(mph) SW 12 G17 NW 6 S 8
Mixing Hgt(ft-agl/msl)4220 4010
Transport Wnd (mph) SW 12 SE 7
Vent Rate (kt-ft) 42200 24060
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-180845-
Southern Hills-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 40 50
Temp (24h trend) 85 (+4) 70 (-3) 86
RH % (24h trend) 69 (-7) 99 (+5) 69
Wind 20ft/early(mph) SW 11 W 9 S 8
Wind 20ft/late(mph) SW 11 W 9 S 8
Mixing Hgt(ft-agl/msl)4690 4700
Transport Wnd (mph) SW 13 SE 8
Vent Rate (kt-ft) 51590 32900
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-180845-
North Coastal Plains-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 90 40 60
Temp (24h trend) 89 (+1) 73 (-2) 88
RH % (24h trend) 65 (-3) 98 (+5) 69
Wind 20ft/early(mph) W 13 S 10 NE 6
Wind 20ft/late(mph) W 13 S 10 NE 6
Mixing Hgt(ft-agl/msl)4950 4380
Transport Wnd (mph) SW 10 SE 5
Vent Rate (kt-ft) 44550 17520
Dispersion 5 5
DSI 5 2 4
RH Recovery Excellent
Remarks...None.
$$
PRZ017-180845-
Northern Hills-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 40 70
Temp (24h trend) 87 (+1) 71 (-3) 86
RH % (24h trend) 68 (-1) 98 (+4) 70
Wind 20ft/early(mph) SW 12 S 9 NE 6
Wind 20ft/late(mph) SW 12 S 9 NE 6
Mixing Hgt(ft-agl/msl)5280 4850
Transport Wnd (mph) SW 13 SE 5
Vent Rate (kt-ft) 58080 19400
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-180845-
West Coast-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 40 60
Temp (24h trend) 88 (+2) 72 (-3) 89
RH % (24h trend) 71 (-4) 99 (+4) 69
Wind 20ft/early(mph) S 11 SE 10 SE 10
Wind 20ft/late(mph) S 11 SE 10 SE 10
Mixing Hgt(ft-agl/msl)4230 4330
Transport Wnd (mph) SW 13 SE 10
Vent Rate (kt-ft) 46530 38970
Dispersion 5 5
DSI 6 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-180845-
Eastern Interior-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 40 50
Temp (24h trend) 88 (+3) 70 (-4) 87
RH % (24h trend) 66 (-4) 100 (+4) 69
Wind 20ft/early(mph) SW 12 SW 10 SE 8
Wind 20ft/late(mph) SW 12 SW 10 SE 8
Mixing Hgt(ft-agl/msl)5120 4980
Transport Wnd (mph) SW 13 S 8
Vent Rate (kt-ft) 56320 34860
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-180845-
Luquillo Mountain Range-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 70 40 40
Temp (24h trend) 84 (+4) 68 (-4) 84
RH % (24h trend) 72 (-4) 100 (+1) 74
Wind 20ft/early(mph) SW 9 SW 5 S 6
Wind 20ft/late(mph) SW 9 SW 5 S 6
Mixing Hgt(ft-agl/msl)4620 4420
Transport Wnd (mph) SW 13 S 9
Vent Rate (kt-ft) 50820 35360
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ023-180845-
Central Mountain Range-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 30 70
Temp (24h trend) 84 (+4) 68 (-4) 85
RH % (24h trend) 71 (-7) 98 (+4) 71
Wind 20ft/early(mph) S 11 S 9 SE 6
Wind 20ft/late(mph) S 11 S 9 SE 6
Mixing Hgt(ft-agl/msl)5160 5320
Transport Wnd (mph) SW 14 S 7
Vent Rate (kt-ft) 61920 31920
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-180845-
Cayey Mountain Range-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 40 50
Temp (24h trend) 83 (+2) 69 (-3) 83
RH % (24h trend) 72 (-4) 100 (+1) 73
Wind 20ft/early(mph) SW 10 SW 6 S 6
Wind 20ft/late(mph) SW 10 SW 6 S 6
Mixing Hgt(ft-agl/msl)4570 4570
Transport Wnd (mph) SW 14 S 8
Vent Rate (kt-ft) 54840 31990
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ025-180845-
Vieques-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 40 50 40
Temp (24h trend) 88 (+1) 75 (-2) 88
RH % (24h trend) 67 (-1) 98 (0) 65
Wind 20ft/early(mph) SW 14 G19 SW 12 S 9
Wind 20ft/late(mph) SW 14 G19 SW 12 S 9
Mixing Hgt(ft-agl/msl)2940 3380
Transport Wnd (mph) SW 18 S 10
Vent Rate (kt-ft) 47040 30420
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-180845-
Culebra-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 50 50 40
Temp (24h trend) 90 (+2) 76 (-2) 90
RH % (24h trend) 65 (-4) 99 (+3) 63
Wind 20ft/early(mph) SW 16 G20 SW 13 G17 S 9
Wind 20ft/late(mph) SW 16 G20 SW 13 G17 S 9
Mixing Hgt(ft-agl/msl)2800 3400
Transport Wnd (mph) SW 18 S 12
Vent Rate (kt-ft) 44800 34000
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-180845-
Southwest Coastal Plains and Mona Island-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 40 50
Temp (24h trend) 89 (+2) 74 (-3) 90
RH % (24h trend) 59 (-10) 94 (+4) 58
Wind 20ft/early(mph) S 13 G18 E 9 SE 12
Wind 20ft/late(mph) S 13 G18 E 9 SE 12
Mixing Hgt(ft-agl/msl)4540 4340
Transport Wnd (mph) SW 12 SE 10
Vent Rate (kt-ft) 45400 39060
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-180845-
Saint Thomas and Saint John-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 60 50
Temp (24h trend) 86 (+2) 75 (-3) 86
RH % (24h trend) 72 (-2) 100 (+4) 71
Wind 20ft/early(mph) SW 14 G19 SW 13 G17 S 9
Wind 20ft/late(mph) SW 14 G19 SW 13 G17 S 9
Mixing Hgt(ft-agl/msl)2980 3220
Transport Wnd (mph) SW 20 S 10
Vent Rate (kt-ft) 50660 28980
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-180845-
St Croix-
439 AM AST Fri Oct 17 2025
Today Tonight Sat
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 50 50
Temp (24h trend) 88 (+3) 76 (-1) 88
RH % (24h trend) 73 (-1) 98 (+1) 70
Wind 20ft/early(mph) S 14 G18 S 11 SE 9
Wind 20ft/late(mph) S 14 G18 S 11 SE 9
Mixing Hgt(ft-agl/msl)3890 4300
Transport Wnd (mph) SW 18 S 12
Vent Rate (kt-ft) 62240 43000
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
$$