Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
573
FNCA52 TJSJ 030909
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
509 AM AST Fri Oct 3 2025
.DISCUSSION...
Today, winds should remain light and variable between 6 - 9 mph.
Although the 24 hour relative humidity trend suggests values near
to below thresholds over the southern coastal plains of Puerto
Rico (53 - 55%), showers and thunderstorms are expected over the
mountain ranges into southern portions of Puerto Rico in the
afternoon. Although partial conditions of fire weather are met,
given the weather forecast, the fire danger threat will remain low
today.
PRZ014-040915-
Southeast Coastal Plains-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 70 60 30
Temp (24h trend) 91 (+2) 72 (-2) 90
RH % (24h trend) 55 (-7) 93 (+5) 59
Wind 20ft/early(mph) SE 9 NE 5 SE 10
Wind 20ft/late(mph) SE 9 NE 5 SE 10
Mixing Hgt(ft-agl/msl)4610 4840
Transport Wnd (mph) E 5 E 7
Vent Rate (kt-ft) 18440 29040
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-040915-
Southern Hills-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 80 40 50
Temp (24h trend) 88 (+3) 68 (-4) 88
RH % (24h trend) 57 (-7) 98 (+7) 60
Wind 20ft/early(mph) E 8 NE 6 SE 8
Wind 20ft/late(mph) E 8 NE 6 SE 8
Mixing Hgt(ft-agl/msl)5240 5550
Transport Wnd (mph) E 5 E 6
Vent Rate (kt-ft) 20960 27750
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-040915-
North Coastal Plains-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 10 40
Temp (24h trend) 90 (0) 72 (-3) 90
RH % (24h trend) 60 (-4) 97 (+6) 62
Wind 20ft/early(mph) NE 9 E 9 E 11
Wind 20ft/late(mph) NE 9 E 9 E 11
Mixing Hgt(ft-agl/msl)4580 4780
Transport Wnd (mph) NE 7 E 7
Vent Rate (kt-ft) 27480 28680
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-040915-
Northern Hills-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 20 10 50
Temp (24h trend) 88 (0) 70 (-2) 88
RH % (24h trend) 61 (-2) 98 (+6) 62
Wind 20ft/early(mph) NE 9 E 8 NE 10
Wind 20ft/late(mph) NE 9 E 8 NE 10
Mixing Hgt(ft-agl/msl)4870 5280
Transport Wnd (mph) NE 6 E 6
Vent Rate (kt-ft) 24350 26400
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-040915-
West Coast-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Mclear Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 30 40
Temp (24h trend) 91 (+1) 71 (-2) 91
RH % (24h trend) 58 (-5) 99 (+7) 60
Wind 20ft/early(mph) S 9 E 10 SE 8
Wind 20ft/late(mph) S 9 E 10 SE 8
Mixing Hgt(ft-agl/msl)4450 4670
Transport Wnd (mph) E 5 SE 3
Vent Rate (kt-ft) 17800 14010
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-040915-
Eastern Interior-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 40 30 70
Temp (24h trend) 89 (+1) 69 (-4) 89
RH % (24h trend) 59 (-2) 100 (+7) 62
Wind 20ft/early(mph) NE 8 E 6 E 10
Wind 20ft/late(mph) NE 8 E 6 E 10
Mixing Hgt(ft-agl/msl)6210 6160
Transport Wnd (mph) NE 5 E 7
Vent Rate (kt-ft) 24840 36960
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-040915-
Luquillo Mountain Range-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 30 40 50
Temp (24h trend) 86 (+4) 68 (-3) 85
RH % (24h trend) 63 (-6) 100 (+3) 66
Wind 20ft/early(mph) NE 6 NE 5 E 8
Wind 20ft/late(mph) NE 6 NE 5 E 8
Mixing Hgt(ft-agl/msl)5250 5110
Transport Wnd (mph) NE 5 SE 7
Vent Rate (kt-ft) 21000 30660
Dispersion 5 5
DSI 5 0 5
RH Recovery Excellent
Remarks...None.
$$
PRZ023-040915-
Central Mountain Range-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 10 80
Temp (24h trend) 87 (+4) 67 (-3) 87
RH % (24h trend) 61 (-5) 98 (+5) 62
Wind 20ft/early(mph) NE 6 E 8 E 5
Wind 20ft/late(mph) NE 6 E 8 E 5
Mixing Hgt(ft-agl/msl)5620 6180
Transport Wnd (mph) E 3 SE 5
Vent Rate (kt-ft) 16860 24720
Dispersion 5 5
DSI 4 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-040915-
Cayey Mountain Range-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 60 40
Temp (24h trend) 86 (+2) 68 (-2) 85
RH % (24h trend) 62 (-3) 100 (+3) 65
Wind 20ft/early(mph) E 8 NE 5 E 8
Wind 20ft/late(mph) E 8 NE 5 E 8
Mixing Hgt(ft-agl/msl)5730 5610
Transport Wnd (mph) NE 5 E 7
Vent Rate (kt-ft) 22920 33660
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ025-040915-
Vieques-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Tstms Showers
Chance Precip (%) 30 60 40
Temp (24h trend) 90 (+1) 76 (-1) 90
RH % (24h trend) 55 (-6) 92 (+5) 58
Wind 20ft/early(mph) NE 6 E 6 E 6
Wind 20ft/late(mph) NE 6 E 6 E 6
Mixing Hgt(ft-agl/msl)3530 3310
Transport Wnd (mph) NE 8 E 7
Vent Rate (kt-ft) 24710 19860
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-040915-
Culebra-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 40 40
Temp (24h trend) 92 (+2) 76 (-3) 91
RH % (24h trend) 54 (-8) 93 (+7) 57
Wind 20ft/early(mph) NE 5 E 6 E 6
Wind 20ft/late(mph) NE 5 E 6 E 6
Mixing Hgt(ft-agl/msl)3540 3340
Transport Wnd (mph) NE 7 E 7
Vent Rate (kt-ft) 21240 20040
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-040915-
Southwest Coastal Plains and Mona Island-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 60 60 30
Temp (24h trend) 93 (+2) 73 (-2) 92
RH % (24h trend) 53 (-5) 93 (+7) 55
Wind 20ft/early(mph) SE 9 NE 9 SE 11
Wind 20ft/late(mph) SE 9 NE 9 SE 11
Mixing Hgt(ft-agl/msl)4680 5100
Transport Wnd (mph) SE 5 SE 7
Vent Rate (kt-ft) 18720 30600
Dispersion 5 5
DSI 4 2 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-040915-
Saint Thomas and Saint John-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 40 40
Temp (24h trend) 87 (0) 75 (-4) 87
RH % (24h trend) 62 (-5) 96 (+8) 63
Wind 20ft/early(mph) NE 5 E 8 E 8
Wind 20ft/late(mph) NE 5 E 8 E 8
Mixing Hgt(ft-agl/msl)3520 3350
Transport Wnd (mph) NE 8 E 9
Vent Rate (kt-ft) 24640 26800
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-040915-
St Croix-
509 AM AST Fri Oct 3 2025
Today Tonight Sat
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 40 40
Temp (24h trend) 90 (+2) 75 (-3) 90
RH % (24h trend) 62 (-5) 95 (+6) 64
Wind 20ft/early(mph) NE 6 E 6 E 6
Wind 20ft/late(mph) NE 6 E 6 E 6
Mixing Hgt(ft-agl/msl)4120 3980
Transport Wnd (mph) E 6 E 8
Vent Rate (kt-ft) 20600 27860
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
$$