Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
587
FNCA52 TJSJ 090859
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
459 AM AST Thu Oct 9 2025
.DISCUSSION...
Lingering moisture continue to move over the region today,
promoting another round of heavy showers and thunderstorm
activity, particularly over the central mountain range; and
portions of western and southern Puerto Rico. Winds will prevail
from the southeast at around 10 mph across the area. Relative
humidity values will remain at to above thresholds over the
southern coastal plains of Puerto Rico (50-60%) due to abundant
moisture across the area. At this time, the fire danger threat
will remain low today.
PRZ014-100900-
Southeast Coastal Plains-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 20 40
Temp (24h trend) 91 (+2) 74 (-2) 90
RH % (24h trend) 53 (-15) 90 (-2) 53
Wind 20ft/early(mph) SE 8 Lgt/Var S 11
Wind 20ft/late(mph) SE 8 Lgt/Var S 11
Mixing Hgt(ft-agl/msl)4350 3970
Transport Wnd (mph) SE 7 W 2
Vent Rate (kt-ft) 26100 7940
Dispersion 5 4
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-100900-
Southern Hills-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 10 40
Temp (24h trend) 88 (+3) 70 (-3) 88
RH % (24h trend) 61 (-10) 98 (+5) 63
Wind 20ft/early(mph) SE 5 N 5 S 9
Wind 20ft/late(mph) SE 5 N 5 S 9
Mixing Hgt(ft-agl/msl)4920 4620
Transport Wnd (mph) SE 6 W 2
Vent Rate (kt-ft) 24600 9240
Dispersion 5 4
DSI 5 1 4
RH Recovery Excellent
Remarks...None.
$$
PRZ016-100900-
North Coastal Plains-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 20 70
Temp (24h trend) 91 (+1) 74 (-2) 91
RH % (24h trend) 65 (-2) 98 (+4) 63
Wind 20ft/early(mph) E 8 Lgt/Var NW 8
Wind 20ft/late(mph) E 8 Lgt/Var NW 8
Mixing Hgt(ft-agl/msl)4310 3910
Transport Wnd (mph) SE 5 N 3
Vent Rate (kt-ft) 17240 11730
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-100900-
Northern Hills-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 10 60
Temp (24h trend) 89 (0) 72 (-1) 89
RH % (24h trend) 66 (-2) 99 (+3) 66
Wind 20ft/early(mph) E 6 Lgt/Var W 8
Wind 20ft/late(mph) E 6 Lgt/Var W 8
Mixing Hgt(ft-agl/msl)4940 4640
Transport Wnd (mph) S 3 NE 1
Vent Rate (kt-ft) 14820 4640
Dispersion 5 4
DSI 5 1 4
RH Recovery Excellent
Remarks...None.
$$
PRZ018-100900-
West Coast-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms None Showers
Chance Precip (%) 50 0 40
Temp (24h trend) 91 (+1) 73 (-2) 91
RH % (24h trend) 62 (-6) 98 (+3) 64
Wind 20ft/early(mph) E 6 NE 5 SW 9
Wind 20ft/late(mph) E 6 NE 5 SW 9
Mixing Hgt(ft-agl/msl)4360 4120
Transport Wnd (mph) S 3 SE 2
Vent Rate (kt-ft) 13080 8240
Dispersion 5 4
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-100900-
Eastern Interior-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 50 70
Temp (24h trend) 89 (+2) 71 (-3) 90
RH % (24h trend) 64 (-5) 99 (+3) 63
Wind 20ft/early(mph) SE 8 NW 5 SW 8
Wind 20ft/late(mph) SE 8 NW 5 SW 8
Mixing Hgt(ft-agl/msl)5000 4680
Transport Wnd (mph) SE 7 NW 3
Vent Rate (kt-ft) 30000 14040
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-100900-
Luquillo Mountain Range-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 50 70
Temp (24h trend) 86 (+4) 69 (-4) 86
RH % (24h trend) 68 (-8) 100 (+1) 67
Wind 20ft/early(mph) SE 6 Lgt/Var Lgt/Var
Wind 20ft/late(mph) SE 6 Lgt/Var Lgt/Var
Mixing Hgt(ft-agl/msl)4210 4120
Transport Wnd (mph) SE 7 NW 3
Vent Rate (kt-ft) 25260 12360
Dispersion 5 4
DSI 6 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ023-100900-
Central Mountain Range-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 10 60
Temp (24h trend) 87 (+4) 69 (-3) 87
RH % (24h trend) 65 (-8) 98 (+3) 66
Wind 20ft/early(mph) SE 5 Lgt/Var SW 6
Wind 20ft/late(mph) SE 5 Lgt/Var SW 6
Mixing Hgt(ft-agl/msl)5590 5110
Transport Wnd (mph) S 3 E 1
Vent Rate (kt-ft) 16770 5110
Dispersion 5 4
DSI 5 1 4
RH Recovery Excellent
Remarks...None.
$$
PRZ024-100900-
Cayey Mountain Range-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 40 50 40
Temp (24h trend) 85 (+2) 69 (-3) 85
RH % (24h trend) 69 (-4) 100 (+1) 67
Wind 20ft/early(mph) SE 5 Lgt/Var S 6
Wind 20ft/late(mph) SE 5 Lgt/Var S 6
Mixing Hgt(ft-agl/msl)4560 4480
Transport Wnd (mph) SE 6 NW 3
Vent Rate (kt-ft) 22800 13440
Dispersion 5 4
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ025-100900-
Vieques-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 50 50 50
Temp (24h trend) 90 (+1) 75 (-2) 90
RH % (24h trend) 60 (-5) 97 (+3) 60
Wind 20ft/early(mph) E 6 NE 8 S 10
Wind 20ft/late(mph) E 6 NE 8 S 10
Mixing Hgt(ft-agl/msl)3390 3090
Transport Wnd (mph) E 14 N 9
Vent Rate (kt-ft) 40680 24720
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-100900-
Culebra-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 92 (+2) 75 (-4) 92
RH % (24h trend) 58 (-8) 96 (0) 59
Wind 20ft/early(mph) E 6 NE 9 S 9
Wind 20ft/late(mph) E 6 NE 9 S 9
Mixing Hgt(ft-agl/msl)3370 3170
Transport Wnd (mph) E 14 NW 10
Vent Rate (kt-ft) 40440 28530
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-100900-
Southwest Coastal Plains and Mona Island-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 40 10 30
Temp (24h trend) 91 (+1) 74 (-3) 92
RH % (24h trend) 52 (-13) 91 (+2) 53
Wind 20ft/early(mph) SE 9 NE 6 S 11
Wind 20ft/late(mph) SE 9 NE 6 S 11
Mixing Hgt(ft-agl/msl)4640 4190
Transport Wnd (mph) SE 7 S 5
Vent Rate (kt-ft) 27840 16760
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-100900-
Saint Thomas and Saint John-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 50 50
Temp (24h trend) 88 (+2) 73 (-5) 88
RH % (24h trend) 65 (-6) 100 (+5) 66
Wind 20ft/early(mph) E 8 NE 9 S 12
Wind 20ft/late(mph) E 8 NE 9 S 12
Mixing Hgt(ft-agl/msl)2930 3250
Transport Wnd (mph) E 16 W 13
Vent Rate (kt-ft) 41020 35750
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-100900-
St Croix-
459 AM AST Thu Oct 9 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Mcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 50 50
Temp (24h trend) 90 (+2) 76 (-3) 90
RH % (24h trend) 63 (-7) 97 (+3) 65
Wind 20ft/early(mph) E 6 N 9 S 9
Wind 20ft/late(mph) E 6 N 9 S 9
Mixing Hgt(ft-agl/msl)3600 4260
Transport Wnd (mph) E 10 W 9
Vent Rate (kt-ft) 32400 34080
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
$$