Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
859
FNCA52 TJSJ 120702
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
302 AM AST Fri Sep 12 2025
.DISCUSSION...
Once again, winds will prevail from the southeast at 10 to 15 mph
with higher gusts across the forecast area today. This pattern is
expected to continue through the weekend, with few showers over
the southern coastal plains of Puerto Rico and St. Croix. However,
relative humidity (RH) will drop into the mid or low 50% across
these areas. KBDI values remain above the threshold values. A
this time, the fire danger risk remains low.
PRZ014-130715-
Southeast Coastal Plains-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 10 30
Temp (24h trend) 92 (+1) 74 (-2) 92
RH % (24h trend) 58 (-3) 95 (+5) 59
Wind 20ft/early(mph) SE 12 G17 E 9 SE 13 G19
Wind 20ft/late(mph) SE 12 G17 E 9 SE 13 G19
Mixing Hgt(ft-agl/msl)4570 4690
Transport Wnd (mph) E 8 E 10
Vent Rate (kt-ft) 31990 42210
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-130715-
Southern Hills-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 20 40
Temp (24h trend) 89 (+2) 70 (-3) 88
RH % (24h trend) 61 (-3) 99 (+5) 62
Wind 20ft/early(mph) SE 10 E 9 SE 11
Wind 20ft/late(mph) SE 10 E 9 SE 11
Mixing Hgt(ft-agl/msl)5220 5170
Transport Wnd (mph) E 7 E 10
Vent Rate (kt-ft) 31320 46530
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-130715-
North Coastal Plains-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 40 60
Temp (24h trend) 92 (+1) 74 (-2) 91
RH % (24h trend) 60 (-4) 99 (+4) 62
Wind 20ft/early(mph) E 12 SE 9 E 13
Wind 20ft/late(mph) E 12 SE 9 E 13
Mixing Hgt(ft-agl/msl)4930 4850
Transport Wnd (mph) E 7 E 9
Vent Rate (kt-ft) 29580 38800
Dispersion 5 5
DSI 5 4 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-130715-
Northern Hills-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 80 40 80
Temp (24h trend) 90 (0) 71 (-2) 89
RH % (24h trend) 63 (+1) 99 (+1) 64
Wind 20ft/early(mph) E 9 SE 8 E 11
Wind 20ft/late(mph) E 9 SE 8 E 11
Mixing Hgt(ft-agl/msl)5430 5250
Transport Wnd (mph) E 5 E 7
Vent Rate (kt-ft) 21720 31500
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-130715-
West Coast-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 30 50
Temp (24h trend) 92 (0) 72 (-2) 92
RH % (24h trend) 61 (-1) 99 (+3) 61
Wind 20ft/early(mph) E 8 E 9 E 10
Wind 20ft/late(mph) E 8 E 9 E 10
Mixing Hgt(ft-agl/msl)4380 4570
Transport Wnd (mph) SE 5 E 6
Vent Rate (kt-ft) 17520 22850
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-130715-
Eastern Interior-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 40 40 50
Temp (24h trend) 90 (+1) 71 (-3) 90
RH % (24h trend) 60 (-3) 99 (+3) 62
Wind 20ft/early(mph) SE 11 SE 9 SE 12
Wind 20ft/late(mph) SE 11 SE 9 SE 12
Mixing Hgt(ft-agl/msl)5760 5430
Transport Wnd (mph) E 8 E 10
Vent Rate (kt-ft) 40320 48870
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-130715-
Luquillo Mountain Range-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 50 50
Temp (24h trend) 86 (+4) 69 (-3) 86
RH % (24h trend) 65 (-7) 100 (+1) 66
Wind 20ft/early(mph) SE 10 E 6 SE 11
Wind 20ft/late(mph) SE 10 E 6 SE 11
Mixing Hgt(ft-agl/msl)4730 4510
Transport Wnd (mph) E 8 E 13
Vent Rate (kt-ft) 33110 49610
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-130715-
Central Mountain Range-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 80 20 70
Temp (24h trend) 87 (+2) 68 (-3) 87
RH % (24h trend) 64 (-1) 99 (+2) 65
Wind 20ft/early(mph) SE 5 SE 6 SE 6
Wind 20ft/late(mph) SE 5 SE 6 SE 6
Mixing Hgt(ft-agl/msl)5980 5760
Transport Wnd (mph) E 5 E 7
Vent Rate (kt-ft) 23920 34560
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-130715-
Cayey Mountain Range-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 30 40
Temp (24h trend) 86 (+2) 70 (-2) 86
RH % (24h trend) 64 (-2) 100 (+1) 65
Wind 20ft/early(mph) SE 9 E 6 SE 10
Wind 20ft/late(mph) SE 9 E 6 SE 10
Mixing Hgt(ft-agl/msl)5250 5010
Transport Wnd (mph) E 8 E 13
Vent Rate (kt-ft) 36750 55110
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-130715-
Vieques-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Tstms Showers
Chance Precip (%) 30 50 40
Temp (24h trend) 91 (+1) 77 (-1) 91
RH % (24h trend) 56 (-4) 95 (+4) 57
Wind 20ft/early(mph) SE 9 E 11 E 11
Wind 20ft/late(mph) SE 9 E 11 E 11
Mixing Hgt(ft-agl/msl)3390 3410
Transport Wnd (mph) E 10 E 13
Vent Rate (kt-ft) 30510 37510
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-130715-
Culebra-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Tstms Showers
Chance Precip (%) 30 50 40
Temp (24h trend) 92 (+2) 78 (-1) 92
RH % (24h trend) 54 (-9) 93 (+3) 56
Wind 20ft/early(mph) SE 10 E 11 E 11
Wind 20ft/late(mph) SE 10 E 11 E 11
Mixing Hgt(ft-agl/msl)3430 3310
Transport Wnd (mph) E 12 E 15
Vent Rate (kt-ft) 34300 43030
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-130715-
Southwest Coastal Plains and Mona Island-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 10 30
Temp (24h trend) 93 (+2) 75 (-2) 93
RH % (24h trend) 57 (-3) 93 (+5) 57
Wind 20ft/early(mph) SE 12 E 11 SE 14 G20
Wind 20ft/late(mph) SE 12 E 11 SE 14 G20
Mixing Hgt(ft-agl/msl)4540 4850
Transport Wnd (mph) E 9 E 10
Vent Rate (kt-ft) 36320 43650
Dispersion 5 5
DSI 5 4 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-130715-
Saint Thomas and Saint John-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 30 30
Temp (24h trend) 89 (+2) 76 (-2) 89
RH % (24h trend) 61 (-5) 97 (+5) 62
Wind 20ft/early(mph) E 10 E 12 E 12
Wind 20ft/late(mph) E 10 E 12 E 12
Mixing Hgt(ft-agl/msl)3460 3290
Transport Wnd (mph) E 10 E 15
Vent Rate (kt-ft) 31140 42770
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-130715-
St Croix-
302 AM AST Fri Sep 12 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 30 30
Temp (24h trend) 91 (+2) 77 (-2) 90
RH % (24h trend) 60 (-4) 94 (+3) 61
Wind 20ft/early(mph) E 10 E 12 E 12
Wind 20ft/late(mph) E 10 E 12 E 12
Mixing Hgt(ft-agl/msl)4700 4300
Transport Wnd (mph) E 12 E 15
Vent Rate (kt-ft) 47000 55900
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$