Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
586
FNCA52 TJSJ 310909
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
509 AM AST Sun Aug 31 2025
.DISCUSSION...
The fire weather threat will be low to moderate today. Wind
speeds are expected to, in general, remain close to threshold
values. RH values will generally around threshold values, although
previous rainfall and today`s forecasted PM showers can provide
relief. KBDI values are at 588 in Cabo Rojo, 541 in Guanica, and
727 at St. Croix. Conditions will continue to be monitored closely
throughout the day for any changes.
PRZ014-010915-
Southeast Coastal Plains-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 50 40
Temp (24h trend) 92 (+1) 74 (-1) 91
RH % (24h trend) 49 (-8) 88 (-2) 52
Wind 20ft/early(mph) SE 14 G20 E 10 SE 11
Wind 20ft/late(mph) SE 14 G20 E 10 SE 11
Mixing Hgt(ft-agl/msl)4300 4730
Transport Wnd (mph) E 12 SE 12
Vent Rate (kt-ft) 43000 47300
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-010915-
Southern Hills-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 50 30 30
Temp (24h trend) 89 (+3) 71 (-1) 89
RH % (24h trend) 59 (-8) 99 (+4) 62
Wind 20ft/early(mph) SE 11 E 8 SE 10
Wind 20ft/late(mph) SE 11 E 8 SE 10
Mixing Hgt(ft-agl/msl)4960 5340
Transport Wnd (mph) E 12 SE 10
Vent Rate (kt-ft) 49600 48060
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-010915-
North Coastal Plains-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 40 50 40
Temp (24h trend) 91 (+1) 74 (-1) 92
RH % (24h trend) 60 (-7) 98 (+1) 61
Wind 20ft/early(mph) E 16 E 13 E 14 G17
Wind 20ft/late(mph) E 16 E 13 E 14 G17
Mixing Hgt(ft-agl/msl)4590 4970
Transport Wnd (mph) E 12 E 10
Vent Rate (kt-ft) 45900 44730
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ017-010915-
Northern Hills-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 50 50
Temp (24h trend) 89 (+1) 72 (0) 89
RH % (24h trend) 63 (-4) 99 (-1) 63
Wind 20ft/early(mph) E 12 E 10 E 11
Wind 20ft/late(mph) E 12 E 10 E 11
Mixing Hgt(ft-agl/msl)5110 5240
Transport Wnd (mph) SE 9 E 8
Vent Rate (kt-ft) 40880 36680
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-010915-
West Coast-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 40 50
Temp (24h trend) 92 (+1) 73 (0) 92
RH % (24h trend) 60 (-6) 98 (0) 61
Wind 20ft/early(mph) E 11 E 11 E 12
Wind 20ft/late(mph) E 11 E 11 E 12
Mixing Hgt(ft-agl/msl)4480 4580
Transport Wnd (mph) SE 8 SE 9
Vent Rate (kt-ft) 31360 36640
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-010915-
Eastern Interior-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 50 50
Temp (24h trend) 90 (+2) 72 (-1) 90
RH % (24h trend) 59 (-5) 99 (+1) 60
Wind 20ft/early(mph) SE 11 E 9 SE 11
Wind 20ft/late(mph) SE 11 E 9 SE 11
Mixing Hgt(ft-agl/msl)5260 6170
Transport Wnd (mph) SE 10 SE 12
Vent Rate (kt-ft) 47340 61700
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-010915-
Luquillo Mountain Range-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 50 60 50
Temp (24h trend) 86 (+4) 68 (-3) 86
RH % (24h trend) 64 (-8) 100 (0) 67
Wind 20ft/early(mph) SE 10 E 6 SE 10
Wind 20ft/late(mph) SE 10 E 6 SE 10
Mixing Hgt(ft-agl/msl)4680 4730
Transport Wnd (mph) SE 10 SE 12
Vent Rate (kt-ft) 42120 47300
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-010915-
Central Mountain Range-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 80 30 50
Temp (24h trend) 87 (+4) 69 (-1) 87
RH % (24h trend) 64 (-8) 99 (0) 65
Wind 20ft/early(mph) SE 8 E 8 SE 8
Wind 20ft/late(mph) SE 8 E 8 SE 8
Mixing Hgt(ft-agl/msl)5520 5770
Transport Wnd (mph) SE 8 SE 8
Vent Rate (kt-ft) 38640 40390
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-010915-
Cayey Mountain Range-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 60 50
Temp (24h trend) 86 (+2) 70 (0) 86
RH % (24h trend) 61 (-5) 100 (0) 63
Wind 20ft/early(mph) SE 10 E 6 SE 9
Wind 20ft/late(mph) SE 10 E 6 SE 9
Mixing Hgt(ft-agl/msl)4780 5380
Transport Wnd (mph) E 10 SE 10
Vent Rate (kt-ft) 43020 48420
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-010915-
Vieques-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 50 50
Temp (24h trend) 90 (+1) 76 (0) 91
RH % (24h trend) 57 (-13) 97 (+3) 58
Wind 20ft/early(mph) E 11 E 11 E 11
Wind 20ft/late(mph) E 11 E 11 E 11
Mixing Hgt(ft-agl/msl)3400 3250
Transport Wnd (mph) E 13 SE 12
Vent Rate (kt-ft) 37400 32500
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-010915-
Culebra-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 40 40
Temp (24h trend) 92 (+2) 75 (-3) 92
RH % (24h trend) 57 (-14) 100 (+6) 59
Wind 20ft/early(mph) E 11 E 11 E 11
Wind 20ft/late(mph) E 11 E 11 E 11
Mixing Hgt(ft-agl/msl)3420 3370
Transport Wnd (mph) E 14 SE 13
Vent Rate (kt-ft) 41040 37070
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-010915-
Southwest Coastal Plains and Mona Island-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 10 30
Temp (24h trend) 93 (+2) 75 (-1) 93
RH % (24h trend) 52 (-5) 90 (+2) 52
Wind 20ft/early(mph) SE 16 G21 E 11 SE 16 G21
Wind 20ft/late(mph) SE 16 G21 E 11 SE 16 G21
Mixing Hgt(ft-agl/msl)4810 4560
Transport Wnd (mph) E 15 SE 15
Vent Rate (kt-ft) 62530 59280
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-010915-
Saint Thomas and Saint John-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 40 40
Temp (24h trend) 89 (+2) 75 (-3) 89
RH % (24h trend) 63 (-11) 98 (+5) 65
Wind 20ft/early(mph) E 11 E 11 E 11
Wind 20ft/late(mph) E 11 E 11 E 11
Mixing Hgt(ft-agl/msl)3400 3360
Transport Wnd (mph) E 15 SE 14
Vent Rate (kt-ft) 44200 40320
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-010915-
St Croix-
509 AM AST Sun Aug 31 2025
Today Tonight Mon
Cloud Cover Mclear Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 40 40
Temp (24h trend) 90 (+2) 77 (-2) 90
RH % (24h trend) 61 (-10) 95 (+6) 63
Wind 20ft/early(mph) E 11 E 11 E 11
Wind 20ft/late(mph) E 11 E 11 E 11
Mixing Hgt(ft-agl/msl)4410 4720
Transport Wnd (mph) E 14 E 14
Vent Rate (kt-ft) 52920 56640
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$