Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
090
FNCA52 TJSJ 170838
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
438 AM AST Sat May 17 2025
.DISCUSSION...
Relative humidity values are mainly expected to drop into the 60s.
Winds will gradually weaken and should remain below fire weather
thresholds across most of the region. During the afternoon, scattered
to locally numerous showers and isolated thunderstorms are forecast,
with the greatest impacts likely over eastern Puerto Rico, the
Cordillera Central, and northwestern Puerto Rico. Latest KBDI values
are below 550. As a result, fire danger risk remains low today across
the area.
PRZ014-180845-
Southeast Coastal Plains-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 50 60
Temp (24h trend) 88 (+3) 71 (-2) 89
RH % (24h trend) 60 (-4) 96 (+3) 60
Wind 20ft/early(mph) E 14 G19 E 11 SE 13 G17
Wind 20ft/late(mph) E 14 G19 E 11 SE 13 G17
Mixing Hgt(ft-agl/msl)3620 3770
Transport Wnd (mph) E 9 E 8
Vent Rate (kt-ft) 28960 26390
Dispersion 5 5
DSI 5 4 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-180845-
Southern Hills-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 40 50
Temp (24h trend) 84 (+4) 68 (-3) 85
RH % (24h trend) 66 (-11) 99 (+4) 66
Wind 20ft/early(mph) E 10 E 8 SE 9
Wind 20ft/late(mph) E 10 E 8 SE 9
Mixing Hgt(ft-agl/msl)4880 4840
Transport Wnd (mph) SE 7 E 6
Vent Rate (kt-ft) 29280 24200
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-180845-
North Coastal Plains-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 30 60
Temp (24h trend) 87 (+2) 70 (-2) 87
RH % (24h trend) 67 (-6) 100 (+2) 66
Wind 20ft/early(mph) E 11 E 9 E 10
Wind 20ft/late(mph) E 11 E 9 E 10
Mixing Hgt(ft-agl/msl)3730 3550
Transport Wnd (mph) E 6 E 7
Vent Rate (kt-ft) 18650 21300
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-180845-
Northern Hills-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 90 40 90
Temp (24h trend) 86 (+4) 68 (-3) 86
RH % (24h trend) 69 (-7) 100 (+1) 69
Wind 20ft/early(mph) E 8 E 8 E 9
Wind 20ft/late(mph) E 8 E 8 E 9
Mixing Hgt(ft-agl/msl)4870 4740
Transport Wnd (mph) E 2 E 3
Vent Rate (kt-ft) 9740 14220
Dispersion 5 5
DSI 4 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-180845-
West Coast-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 30 70
Temp (24h trend) 88 (+3) 69 (-3) 89
RH % (24h trend) 64 (-9) 100 (+4) 65
Wind 20ft/early(mph) E 10 E 8 E 9
Wind 20ft/late(mph) E 10 E 8 E 9
Mixing Hgt(ft-agl/msl)4690 4480
Transport Wnd (mph) SE 5 E 3
Vent Rate (kt-ft) 18760 13440
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-180845-
Eastern Interior-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 50 60
Temp (24h trend) 84 (+2) 69 (-2) 85
RH % (24h trend) 70 (-5) 100 (+1) 69
Wind 20ft/early(mph) E 10 E 6 E 8
Wind 20ft/late(mph) E 10 E 6 E 8
Mixing Hgt(ft-agl/msl)4240 4090
Transport Wnd (mph) SE 7 E 7
Vent Rate (kt-ft) 25440 24540
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-180845-
Luquillo Mountain Range-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 60 70
Temp (24h trend) 79 (+2) 67 (-2) 80
RH % (24h trend) 77 (-3) 100 (+1) 76
Wind 20ft/early(mph) E 9 Lgt/Var E 6
Wind 20ft/late(mph) E 9 Lgt/Var E 6
Mixing Hgt(ft-agl/msl)3480 3440
Transport Wnd (mph) SE 8 E 7
Vent Rate (kt-ft) 24360 20640
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ023-180845-
Central Mountain Range-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 50 80
Temp (24h trend) 82 (+4) 65 (-4) 83
RH % (24h trend) 69 (-10) 100 (+3) 69
Wind 20ft/early(mph) E 6 E 5 E 5
Wind 20ft/late(mph) E 6 E 5 E 5
Mixing Hgt(ft-agl/msl)5680 5670
Transport Wnd (mph) SE 3 SE 3
Vent Rate (kt-ft) 17040 17010
Dispersion 5 5
DSI 4 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-180845-
Cayey Mountain Range-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Mcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 70 60
Temp (24h trend) 80 (+3) 67 (-2) 81
RH % (24h trend) 77 (-6) 100 (0) 75
Wind 20ft/early(mph) E 9 E 6 E 8
Wind 20ft/late(mph) E 9 E 6 E 8
Mixing Hgt(ft-agl/msl)3310 3740
Transport Wnd (mph) E 10 E 8
Vent Rate (kt-ft) 29790 26180
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ025-180845-
Vieques-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 60 70
Temp (24h trend) 85 (0) 72 (-1) 86
RH % (24h trend) 66 (-2) 97 (-2) 64
Wind 20ft/early(mph) E 12 E 11 E 10
Wind 20ft/late(mph) E 12 E 11 E 10
Mixing Hgt(ft-agl/msl)2260 3130
Transport Wnd (mph) E 15 E 12
Vent Rate (kt-ft) 29380 31300
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-180845-
Culebra-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 60 70
Temp (24h trend) 87 (+1) 73 (-1) 87
RH % (24h trend) 65 (-4) 96 (-2) 63
Wind 20ft/early(mph) E 12 E 10 E 10
Wind 20ft/late(mph) E 12 E 10 E 10
Mixing Hgt(ft-agl/msl)2210 3100
Transport Wnd (mph) E 14 E 12
Vent Rate (kt-ft) 26520 31000
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-180845-
Southwest Coastal Plains and Mona Island-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 20 30
Temp (24h trend) 89 (+3) 72 (-2) 90
RH % (24h trend) 59 (-3) 96 (+6) 59
Wind 20ft/early(mph) E 14 G19 E 11 SE 12
Wind 20ft/late(mph) E 14 G19 E 11 SE 12
Mixing Hgt(ft-agl/msl)4810 4780
Transport Wnd (mph) E 9 E 7
Vent Rate (kt-ft) 38480 28680
Dispersion 5 5
DSI 5 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-180845-
Saint Thomas and Saint John-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Mcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 60 50
Temp (24h trend) 85 (0) 72 (-1) 86
RH % (24h trend) 64 (-6) 99 (0) 65
Wind 20ft/early(mph) E 16 G20 E 12 E 10
Wind 20ft/late(mph) E 16 G20 E 12 E 10
Mixing Hgt(ft-agl/msl)1910 2920
Transport Wnd (mph) SE 15 E 10
Vent Rate (kt-ft) 24830 26280
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-180845-
St Croix-
438 AM AST Sat May 17 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 40 50
Temp (24h trend) 85 (-1) 74 (0) 87
RH % (24h trend) 68 (-2) 98 (-2) 68
Wind 20ft/early(mph) E 17 G20 E 16 G19 E 11
Wind 20ft/late(mph) E 17 G20 E 16 G19 E 11
Mixing Hgt(ft-agl/msl)2240 2910
Transport Wnd (mph) E 18 E 15
Vent Rate (kt-ft) 35840 37830
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
$$