Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
772
FNCA52 TJSJ 270923
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
523 AM AST Wed Aug 27 2025
.DISCUSSION...
KBDI values continue a gradual rise across the region, with Cabo
Rojo at 572 and Guanica at 518. Today, wind speeds are expected
to decrease compared to yesterday, but could still reach threshold
values at times. A gradual increase in moisture is forecast for
today as a mid to upper level trough prevails. However, the
overall fire weather threat remains low, with any risk expected to
be of limited duration and spatial extent. Conditions will
continue to be monitored closely throughout the day for any
changes.
PRZ014-280930-
Southeast Coastal Plains-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Mclear Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 10 30 30
Temp (24h trend) 91 (0) 74 (-2) 91
RH % (24h trend) 52 (-8) 92 (+4) 52
Wind 20ft/early(mph) SE 14 G20 E 11 SE 14 G20
Wind 20ft/late(mph) SE 14 G20 E 11 SE 14 G20
Mixing Hgt(ft-agl/msl)4900 4540
Transport Wnd (mph) E 14 SE 14
Vent Rate (kt-ft) 58800 54480
Dispersion 5 5
DSI 5 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-280930-
Southern Hills-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 20 30
Temp (24h trend) 88 (+2) 71 (-2) 89
RH % (24h trend) 61 (-3) 99 (+6) 62
Wind 20ft/early(mph) SE 11 E 9 SE 12
Wind 20ft/late(mph) SE 11 E 9 SE 12
Mixing Hgt(ft-agl/msl)5420 5340
Transport Wnd (mph) E 13 SE 14
Vent Rate (kt-ft) 59620 64080
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-280930-
North Coastal Plains-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 30 50
Temp (24h trend) 92 (+1) 74 (-2) 92
RH % (24h trend) 60 (-4) 98 (+3) 61
Wind 20ft/early(mph) E 17 G19 SE 12 E 13
Wind 20ft/late(mph) E 17 G19 SE 12 E 13
Mixing Hgt(ft-agl/msl)5080 5570
Transport Wnd (mph) E 14 SE 10
Vent Rate (kt-ft) 60960 50130
Dispersion 5 5
DSI 6 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-280930-
Northern Hills-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 0 60
Temp (24h trend) 89 (0) 71 (-2) 90
RH % (24h trend) 62 (-1) 98 (0) 62
Wind 20ft/early(mph) E 13 SE 10 E 11
Wind 20ft/late(mph) E 13 SE 10 E 11
Mixing Hgt(ft-agl/msl)5840 6050
Transport Wnd (mph) E 10 SE 9
Vent Rate (kt-ft) 52560 48400
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-280930-
West Coast-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Mclear
Precip Type Tstms None Showers
Chance Precip (%) 30 0 30
Temp (24h trend) 91 (0) 73 (-1) 92
RH % (24h trend) 60 (-3) 99 (+3) 60
Wind 20ft/early(mph) E 11 E 11 SE 14 G17
Wind 20ft/late(mph) E 11 E 11 SE 14 G17
Mixing Hgt(ft-agl/msl)4610 4940
Transport Wnd (mph) E 9 SE 15
Vent Rate (kt-ft) 36880 64220
Dispersion 5 5
DSI 5 4 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-280930-
Eastern Interior-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 40 40
Temp (24h trend) 90 (+2) 72 (-2) 90
RH % (24h trend) 60 (-3) 99 (+2) 61
Wind 20ft/early(mph) SE 12 SE 11 SE 12
Wind 20ft/late(mph) SE 12 SE 11 SE 12
Mixing Hgt(ft-agl/msl)6210 5880
Transport Wnd (mph) E 13 SE 13
Vent Rate (kt-ft) 68310 64680
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-280930-
Luquillo Mountain Range-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 50 50
Temp (24h trend) 86 (+4) 70 (-2) 86
RH % (24h trend) 67 (-6) 100 (+1) 66
Wind 20ft/early(mph) SE 10 SE 9 SE 10
Wind 20ft/late(mph) SE 10 SE 9 SE 10
Mixing Hgt(ft-agl/msl)4710 4590
Transport Wnd (mph) E 14 SE 13
Vent Rate (kt-ft) 56520 50490
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-280930-
Central Mountain Range-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 50 0 40
Temp (24h trend) 87 (+3) 68 (-3) 87
RH % (24h trend) 64 (-2) 98 (+1) 63
Wind 20ft/early(mph) SE 9 SE 6 SE 10
Wind 20ft/late(mph) SE 9 SE 6 SE 10
Mixing Hgt(ft-agl/msl)6430 6220
Transport Wnd (mph) E 10 SE 13
Vent Rate (kt-ft) 57870 68420
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-280930-
Cayey Mountain Range-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 30 30
Temp (24h trend) 85 (+1) 71 (-1) 86
RH % (24h trend) 65 (-1) 100 (+1) 65
Wind 20ft/early(mph) SE 10 SE 8 SE 10
Wind 20ft/late(mph) SE 10 SE 8 SE 10
Mixing Hgt(ft-agl/msl)5240 4740
Transport Wnd (mph) E 14 SE 13
Vent Rate (kt-ft) 62880 52140
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-280930-
Vieques-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 50 50 30
Temp (24h trend) 90 (+1) 77 (-1) 90
RH % (24h trend) 59 (-1) 93 (+2) 59
Wind 20ft/early(mph) SE 12 E 13 SE 10
Wind 20ft/late(mph) SE 12 E 13 SE 10
Mixing Hgt(ft-agl/msl)3420 3480
Transport Wnd (mph) E 15 SE 14
Vent Rate (kt-ft) 44460 41760
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-280930-
Culebra-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 50 50 20
Temp (24h trend) 90 (0) 78 (-1) 92
RH % (24h trend) 59 (-4) 94 (+1) 60
Wind 20ft/early(mph) E 12 E 13 SE 11
Wind 20ft/late(mph) E 12 E 13 SE 11
Mixing Hgt(ft-agl/msl)3340 3510
Transport Wnd (mph) E 15 SE 15
Vent Rate (kt-ft) 43420 45630
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-280930-
Southwest Coastal Plains and Mona Island-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Mclear Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 10 10 10
Temp (24h trend) 92 (+1) 75 (-2) 93
RH % (24h trend) 52 (-7) 92 (+6) 53
Wind 20ft/early(mph) SE 16 G22 E 16 G18 SE 19 G24
Wind 20ft/late(mph) SE 16 G22 E 16 G18 SE 19 G24
Mixing Hgt(ft-agl/msl)4700 4820
Transport Wnd (mph) E 15 SE 18
Vent Rate (kt-ft) 61100 77120
Dispersion 5 5
DSI 5 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-280930-
Saint Thomas and Saint John-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 30 20
Temp (24h trend) 88 (+1) 76 (-3) 88
RH % (24h trend) 65 (-2) 96 (+3) 66
Wind 20ft/early(mph) SE 12 E 13 SE 12
Wind 20ft/late(mph) SE 12 E 13 SE 12
Mixing Hgt(ft-agl/msl)3380 3430
Transport Wnd (mph) E 15 SE 15
Vent Rate (kt-ft) 43940 44590
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-280930-
St Croix-
523 AM AST Wed Aug 27 2025
Today Tonight Thu
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 20 30
Temp (24h trend) 90 (+2) 77 (-2) 90
RH % (24h trend) 63 (-2) 94 (+3) 63
Wind 20ft/early(mph) SE 12 E 11 SE 11
Wind 20ft/late(mph) SE 12 E 11 SE 11
Mixing Hgt(ft-agl/msl)4560 4450
Transport Wnd (mph) E 16 SE 13
Vent Rate (kt-ft) 63840 48950
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$