Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
Versions:
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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.
$$
VIZ002-040830-
St Croix-
426 AM AST Wed Sep 3 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 20 20
Temp (24h trend) 91 (+3) 78 (-1) 91
RH % (24h trend) 61 (-8) 88 (-3) 59
Wind 20ft/early(mph) E 13 G18 E 13 E 13
Wind 20ft/late(mph) E 13 G18 E 13 E 13
Mixing Hgt(ft-agl/msl)4710 5070
Transport Wnd (mph) E 18 E 17
Vent Rate (kt-ft) 75360 76050
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$