Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
918
FNCA52 TJSJ 030826
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
426 AM AST Wed Sep 3 2025
.DISCUSSION...
SAme as yesterday`s weather pattern, the available moisture will
result in a showery pattern along the main island today.As of now
(4 AM ) satellite imagery show areas of cloudiness affecting most
of the southern coastal plains. In terms of winds, they are expected
up to 15 mph from the E-SE with occasional gusts along the
coasts. Although KBDI values across the southern plains suggest
some potential for fire weather concerns, relative humidity will
remain in the mid-50s during the morning and increase even further
after noon. Therefore, the overall fire danger threat will remain
low today.
PRZ014-040830-
Southeast Coastal Plains-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 40 30 10
Temp (24h trend) 91 (0) 74 (-2) 91
RH % (24h trend) 52 (-11) 91 (+1) 49
Wind 20ft/early(mph) SE 12 G17 E 10 SE 16 G21
Wind 20ft/late(mph) SE 12 G17 E 10 SE 16 G21
Mixing Hgt(ft-agl/msl)4640 5050
Transport Wnd (mph) E 14 E 15
Vent Rate (kt-ft) 55680 65650
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-040830-
Southern Hills-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Tstms Showers Showers
Chance Precip (%) 40 30 30
Temp (24h trend) 88 (+2) 70 (-3) 87
RH % (24h trend) 62 (-6) 98 (+2) 61
Wind 20ft/early(mph) SE 11 E 10 SE 12
Wind 20ft/late(mph) SE 11 E 10 SE 12
Mixing Hgt(ft-agl/msl)5220 5570
Transport Wnd (mph) E 13 E 14
Vent Rate (kt-ft) 57420 66840
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-040830-
North Coastal Plains-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Tstms Showers Showers
Chance Precip (%) 60 20 40
Temp (24h trend) 91 (0) 74 (-2) 91
RH % (24h trend) 62 (-4) 97 (+1) 62
Wind 20ft/early(mph) E 13 SE 10 E 17
Wind 20ft/late(mph) E 13 SE 10 E 17
Mixing Hgt(ft-agl/msl)5130 5190
Transport Wnd (mph) E 13 E 15
Vent Rate (kt-ft) 56430 67470
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ017-040830-
Northern Hills-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Tstms Showers Tstms
Chance Precip (%) 80 0 50
Temp (24h trend) 89 (+1) 71 (-2) 90
RH % (24h trend) 64 (-3) 97 (-1) 63
Wind 20ft/early(mph) E 11 SE 9 E 13
Wind 20ft/late(mph) E 11 SE 9 E 13
Mixing Hgt(ft-agl/msl)5290 5470
Transport Wnd (mph) E 9 E 13
Vent Rate (kt-ft) 42320 60170
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-040830-
West Coast-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Tstms None Tstms
Chance Precip (%) 30 0 50
Temp (24h trend) 92 (+2) 72 (-2) 92
RH % (24h trend) 62 (-4) 99 (+1) 58
Wind 20ft/early(mph) E 12 E 11 E 13
Wind 20ft/late(mph) E 12 E 11 E 13
Mixing Hgt(ft-agl/msl)4850 4890
Transport Wnd (mph) SE 10 E 10
Vent Rate (kt-ft) 43650 44010
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-040830-
Eastern Interior-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Showers Showers
Chance Precip (%) 50 40 20
Temp (24h trend) 90 (+2) 72 (-2) 90
RH % (24h trend) 61 (-4) 99 (+1) 61
Wind 20ft/early(mph) SE 11 SE 11 E 12
Wind 20ft/late(mph) SE 11 SE 11 E 12
Mixing Hgt(ft-agl/msl)5510 5960
Transport Wnd (mph) SE 13 E 14
Vent Rate (kt-ft) 60610 71520
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-040830-
Luquillo Mountain Range-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 50 40
Temp (24h trend) 86 (+4) 68 (-4) 85
RH % (24h trend) 66 (-8) 100 (0) 66
Wind 20ft/early(mph) SE 10 E 9 E 10
Wind 20ft/late(mph) SE 10 E 9 E 10
Mixing Hgt(ft-agl/msl)4190 4850
Transport Wnd (mph) SE 14 E 14
Vent Rate (kt-ft) 50280 58200
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-040830-
Central Mountain Range-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms None Tstms
Chance Precip (%) 70 0 70
Temp (24h trend) 87 (+4) 68 (-2) 87
RH % (24h trend) 65 (-7) 99 (+1) 64
Wind 20ft/early(mph) SE 8 SE 5 E 9
Wind 20ft/late(mph) SE 8 SE 5 E 9
Mixing Hgt(ft-agl/msl)5560 5930
Transport Wnd (mph) SE 9 E 10
Vent Rate (kt-ft) 44480 53370
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-040830-
Cayey Mountain Range-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Tstms Showers
Chance Precip (%) 50 50 10
Temp (24h trend) 86 (+2) 69 (-3) 84
RH % (24h trend) 64 (-6) 100 (0) 66
Wind 20ft/early(mph) SE 9 E 9 E 10
Wind 20ft/late(mph) SE 9 E 9 E 10
Mixing Hgt(ft-agl/msl)4480 5110
Transport Wnd (mph) SE 14 E 14
Vent Rate (kt-ft) 53760 61320
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-040830-
Vieques-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Tstms Showers
Chance Precip (%) 40 50 20
Temp (24h trend) 90 (0) 77 (0) 91
RH % (24h trend) 58 (-4) 92 (-3) 56
Wind 20ft/early(mph) SE 12 E 14 G18 E 12
Wind 20ft/late(mph) SE 12 E 14 G18 E 12
Mixing Hgt(ft-agl/msl)3580 3700
Transport Wnd (mph) SE 15 E 16
Vent Rate (kt-ft) 46540 51800
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-040830-
Culebra-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 40 30 20
Temp (24h trend) 90 (+1) 76 (-1) 92
RH % (24h trend) 60 (-7) 96 (-3) 58
Wind 20ft/early(mph) E 13 G17 E 13 G17 E 12
Wind 20ft/late(mph) E 13 G17 E 13 G17 E 12
Mixing Hgt(ft-agl/msl)3630 3840
Transport Wnd (mph) SE 16 E 16
Vent Rate (kt-ft) 50820 53760
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-040830-
Southwest Coastal Plains and Mona Island-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 20 10 10
Temp (24h trend) 93 (+3) 74 (-2) 93
RH % (24h trend) 51 (-13) 95 (+4) 51
Wind 20ft/early(mph) SE 17 G22 E 16 G20 SE 18 G23
Wind 20ft/late(mph) SE 17 G22 E 16 G20 SE 18 G23
Mixing Hgt(ft-agl/msl)4970 5100
Transport Wnd (mph) E 16 E 16
Vent Rate (kt-ft) 69580 71400
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-040830-
Saint Thomas and Saint John-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 10 20
Temp (24h trend) 87 (+3) 74 (-3) 87
RH % (24h trend) 67 (-8) 99 (+2) 65
Wind 20ft/early(mph) E 14 G18 E 14 G19 E 13 G17
Wind 20ft/late(mph) E 14 G18 E 14 G19 E 13 G17
Mixing Hgt(ft-agl/msl)3600 3630
Transport Wnd (mph) E 17 E 17
Vent Rate (kt-ft) 54000 54450
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-040830-
St Croix-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 20 20
Temp (24h trend) 91 (+3) 78 (-1) 91
RH % (24h trend) 61 (-8) 88 (-3) 59
Wind 20ft/early(mph) E 13 G18 E 13 E 13
Wind 20ft/late(mph) E 13 G18 E 13 E 13
Mixing Hgt(ft-agl/msl)4710 5070
Transport Wnd (mph) E 18 E 17
Vent Rate (kt-ft) 75360 76050
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$