Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
291
FNCA52 TJSJ 020735
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
335 AM AST Tue Sep 2 2025
.DISCUSSION...
A southeasterly wind flow, combined with plenty of moisture, will
promote warmer and more humid conditions across the coastal areas
of the islands. Additionally, the avalaible moisture will result
in a showery pattern along the main island today. Winds are
expected to increase around 10 AM, reaching near 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.
PRZ014-030745-
Southeast Coastal Plains-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Showers Showers
Chance Precip (%) 50 30 10
Temp (24h trend) 92 (+2) 74 (-3) 90
RH % (24h trend) 58 (+2) 95 (+11) 53
Wind 20ft/early(mph) SE 12 E 10 SE 16 G20
Wind 20ft/late(mph) SE 12 E 10 SE 16 G20
Mixing Hgt(ft-agl/msl)4860 5090
Transport Wnd (mph) E 12 E 15
Vent Rate (kt-ft) 48600 66170
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-030745-
Southern Hills-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 30 30
Temp (24h trend) 89 (+4) 69 (-6) 87
RH % (24h trend) 62 (-5) 100 (+10) 64
Wind 20ft/early(mph) SE 10 E 8 SE 12
Wind 20ft/late(mph) SE 10 E 8 SE 12
Mixing Hgt(ft-agl/msl)5530 5820
Transport Wnd (mph) E 10 E 14
Vent Rate (kt-ft) 49770 69840
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ016-030745-
North Coastal Plains-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 30 50
Temp (24h trend) 92 (+2) 74 (-3) 90
RH % (24h trend) 61 (-5) 99 (+8) 65
Wind 20ft/early(mph) E 16 G18 SE 10 E 17
Wind 20ft/late(mph) E 16 G18 SE 10 E 17
Mixing Hgt(ft-agl/msl)5140 5480
Transport Wnd (mph) E 10 E 13
Vent Rate (kt-ft) 46260 60280
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-030745-
Northern Hills-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 90 60 60
Temp (24h trend) 90 (+2) 71 (-3) 88
RH % (24h trend) 64 (-3) 99 (+7) 66
Wind 20ft/early(mph) E 13 SE 9 E 13
Wind 20ft/late(mph) E 13 SE 9 E 13
Mixing Hgt(ft-agl/msl)5640 6010
Transport Wnd (mph) SE 8 SE 10
Vent Rate (kt-ft) 39480 54090
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-030745-
West Coast-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 40 40
Temp (24h trend) 91 (0) 72 (-3) 91
RH % (24h trend) 62 (-2) 100 (+8) 64
Wind 20ft/early(mph) E 11 E 9 E 14
Wind 20ft/late(mph) E 11 E 9 E 14
Mixing Hgt(ft-agl/msl)4750 4990
Transport Wnd (mph) E 8 E 10
Vent Rate (kt-ft) 33250 44910
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-030745-
Eastern Interior-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 50 30
Temp (24h trend) 91 (+3) 71 (-5) 89
RH % (24h trend) 60 (-4) 100 (+8) 63
Wind 20ft/early(mph) SE 11 SE 10 SE 12
Wind 20ft/late(mph) SE 11 SE 10 SE 12
Mixing Hgt(ft-agl/msl)6440 5990
Transport Wnd (mph) SE 10 SE 15
Vent Rate (kt-ft) 57960 77870
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ022-030745-
Luquillo Mountain Range-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Mcldy Mcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 60 60 50
Temp (24h trend) 86 (+4) 69 (-4) 84
RH % (24h trend) 66 (-5) 100 (+2) 70
Wind 20ft/early(mph) SE 9 SE 8 SE 11
Wind 20ft/late(mph) SE 9 SE 8 SE 11
Mixing Hgt(ft-agl/msl)4290 4260
Transport Wnd (mph) SE 12 SE 16
Vent Rate (kt-ft) 42900 59640
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-030745-
Central Mountain Range-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 60 50
Temp (24h trend) 87 (+5) 67 (-5) 86
RH % (24h trend) 65 (-7) 100 (+7) 67
Wind 20ft/early(mph) SE 8 SE 5 SE 9
Wind 20ft/late(mph) SE 8 SE 5 SE 9
Mixing Hgt(ft-agl/msl)6200 6390
Transport Wnd (mph) E 8 SE 10
Vent Rate (kt-ft) 43400 57510
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-030745-
Cayey Mountain Range-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 87 (+3) 70 (-4) 84
RH % (24h trend) 64 (-3) 100 (+4) 68
Wind 20ft/early(mph) SE 9 E 6 SE 11
Wind 20ft/late(mph) SE 9 E 6 SE 11
Mixing Hgt(ft-agl/msl)5170 4680
Transport Wnd (mph) SE 10 E 15
Vent Rate (kt-ft) 46530 60840
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-030745-
Vieques-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 60 60 50
Temp (24h trend) 91 (+1) 76 (-2) 88
RH % (24h trend) 59 (-2) 97 (+6) 62
Wind 20ft/early(mph) SE 11 E 12 SE 13 G17
Wind 20ft/late(mph) SE 11 E 12 SE 13 G17
Mixing Hgt(ft-agl/msl)3350 3850
Transport Wnd (mph) SE 14 SE 17
Vent Rate (kt-ft) 40200 57750
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-030745-
Culebra-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 50 50 50
Temp (24h trend) 91 (+1) 75 (-3) 88
RH % (24h trend) 60 (-5) 100 (+6) 67
Wind 20ft/early(mph) SE 11 E 12 E 13 G17
Wind 20ft/late(mph) SE 11 E 12 E 13 G17
Mixing Hgt(ft-agl/msl)3320 3700
Transport Wnd (mph) SE 14 E 18
Vent Rate (kt-ft) 39840 59200
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-030745-
Southwest Coastal Plains and Mona Island-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 30 20 20
Temp (24h trend) 91 (0) 74 (-4) 92
RH % (24h trend) 59 (+5) 98 (+15) 52
Wind 20ft/early(mph) SE 16 G21 E 12 SE 20 G26
Wind 20ft/late(mph) SE 16 G21 E 12 SE 20 G26
Mixing Hgt(ft-agl/msl)4990 5180
Transport Wnd (mph) E 14 E 17
Vent Rate (kt-ft) 59880 77700
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-030745-
Saint Thomas and Saint John-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 50 50
Temp (24h trend) 85 (0) 74 (-4) 85
RH % (24h trend) 71 (-2) 100 (+6) 71
Wind 20ft/early(mph) SE 11 E 13 G17 E 14 G18
Wind 20ft/late(mph) SE 11 E 13 G17 E 14 G18
Mixing Hgt(ft-agl/msl)3350 3630
Transport Wnd (mph) SE 14 E 17
Vent Rate (kt-ft) 40200 54450
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-030745-
St Croix-
335 AM AST Tue Sep 2 2025
Today Tonight Wed
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 50 30
Temp (24h trend) 90 (+1) 77 (-4) 88
RH % (24h trend) 65 (0) 93 (+6) 66
Wind 20ft/early(mph) SE 12 E 12 E 14 G18
Wind 20ft/late(mph) SE 12 E 12 E 14 G18
Mixing Hgt(ft-agl/msl)4640 4740
Transport Wnd (mph) SE 15 E 17
Vent Rate (kt-ft) 60320 71100
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$