Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
510
FNCA52 TJSJ 180922
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
522 AM AST Sat Oct 18 2025
.DISCUSSION...
Today, the fire threat is LOW across the vulnerable areas. During
the overnight hours showers and thunderstorms filtered across the
typical fire weather hot spots, increasing moisture/rainfall
activity. We anticipate additional rainfall activity across the
areas during the weekend.
PRZ014-190930-
Southeast Coastal Plains-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Tstms Showers
Chance Precip (%) 50 40 20
Temp (24h trend) 89 (+2) 74 (-1) 89
RH % (24h trend) 58 (-7) 94 (+1) 52
Wind 20ft/early(mph) S 6 Lgt/Var SE 12
Wind 20ft/late(mph) S 6 Lgt/Var SE 12
Mixing Hgt(ft-agl/msl)4030 4370
Transport Wnd (mph) S 5 E 13
Vent Rate (kt-ft) 16120 48070
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-190930-
Southern Hills-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 40 30 30
Temp (24h trend) 86 (+4) 71 (-2) 85
RH % (24h trend) 67 (-10) 98 (+2) 65
Wind 20ft/early(mph) S 6 Lgt/Var E 10
Wind 20ft/late(mph) S 6 Lgt/Var E 10
Mixing Hgt(ft-agl/msl)4590 4890
Transport Wnd (mph) S 6 E 9
Vent Rate (kt-ft) 22950 39120
Dispersion 5 5
DSI 5 1 6
RH Recovery Excellent
Remarks...None.
$$
PRZ016-190930-
North Coastal Plains-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Showers Showers
Chance Precip (%) 70 40 20
Temp (24h trend) 88 (0) 73 (-2) 88
RH % (24h trend) 68 (-2) 98 (+3) 67
Wind 20ft/early(mph) E 9 SE 5 E 14
Wind 20ft/late(mph) E 9 SE 5 E 14
Mixing Hgt(ft-agl/msl)4240 4790
Transport Wnd (mph) SE 5 E 9
Vent Rate (kt-ft) 16960 38320
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ017-190930-
Northern Hills-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 30 40
Temp (24h trend) 86 (0) 71 (-2) 86
RH % (24h trend) 70 (-1) 97 (+1) 69
Wind 20ft/early(mph) NE 6 SE 5 E 11
Wind 20ft/late(mph) NE 6 SE 5 E 11
Mixing Hgt(ft-agl/msl)4750 5480
Transport Wnd (mph) S 5 E 6
Vent Rate (kt-ft) 19000 27400
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-190930-
West Coast-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 30 40
Temp (24h trend) 89 (+2) 74 (0) 89
RH % (24h trend) 68 (-8) 97 (0) 67
Wind 20ft/early(mph) SE 9 E 8 E 11
Wind 20ft/late(mph) SE 9 E 8 E 11
Mixing Hgt(ft-agl/msl)4090 4700
Transport Wnd (mph) S 9 E 8
Vent Rate (kt-ft) 32720 32900
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ019-190930-
Eastern Interior-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Tstms Showers
Chance Precip (%) 50 50 20
Temp (24h trend) 87 (+1) 71 (-2) 86
RH % (24h trend) 67 (-4) 100 (+2) 68
Wind 20ft/early(mph) S 9 SE 5 E 10
Wind 20ft/late(mph) S 9 SE 5 E 10
Mixing Hgt(ft-agl/msl)4910 5000
Transport Wnd (mph) S 7 SE 10
Vent Rate (kt-ft) 29460 45000
Dispersion 5 5
DSI 5 1 6
RH Recovery Excellent
Remarks...None.
$$
PRZ022-190930-
Luquillo Mountain Range-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Mcldy Mclear
Precip Type Showers Tstms Showers
Chance Precip (%) 40 60 40
Temp (24h trend) 84 (+4) 69 (-2) 82
RH % (24h trend) 73 (-7) 100 (0) 74
Wind 20ft/early(mph) S 5 Lgt/Var E 10
Wind 20ft/late(mph) S 5 Lgt/Var E 10
Mixing Hgt(ft-agl/msl)3940 4130
Transport Wnd (mph) S 7 SE 12
Vent Rate (kt-ft) 23640 41300
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-190930-
Central Mountain Range-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 30 60
Temp (24h trend) 85 (+5) 69 (-2) 84
RH % (24h trend) 70 (-8) 97 (+1) 69
Wind 20ft/early(mph) SE 9 SE 6 E 9
Wind 20ft/late(mph) SE 9 SE 6 E 9
Mixing Hgt(ft-agl/msl)5290 6190
Transport Wnd (mph) S 6 E 6
Vent Rate (kt-ft) 26450 30950
Dispersion 5 5
DSI 5 1 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-190930-
Cayey Mountain Range-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Tstms Showers
Chance Precip (%) 40 50 20
Temp (24h trend) 83 (+2) 70 (-1) 82
RH % (24h trend) 72 (-6) 100 (0) 72
Wind 20ft/early(mph) S 5 Lgt/Var E 9
Wind 20ft/late(mph) S 5 Lgt/Var E 9
Mixing Hgt(ft-agl/msl)4300 4370
Transport Wnd (mph) S 7 E 10
Vent Rate (kt-ft) 25800 39330
Dispersion 5 5
DSI 5 1 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-190930-
Vieques-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Tstms Tstms Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 88 (+1) 76 (0) 87
RH % (24h trend) 64 (-7) 96 (-2) 66
Wind 20ft/early(mph) S 9 SE 8 E 11
Wind 20ft/late(mph) S 9 SE 8 E 11
Mixing Hgt(ft-agl/msl)3130 3460
Transport Wnd (mph) S 12 E 12
Vent Rate (kt-ft) 31300 34600
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-190930-
Culebra-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Mcldy Mcldy Mclear
Precip Type Tstms Tstms Tstms
Chance Precip (%) 60 70 50
Temp (24h trend) 90 (+2) 77 (-1) 89
RH % (24h trend) 64 (-8) 95 (-2) 64
Wind 20ft/early(mph) S 10 SE 8 E 11
Wind 20ft/late(mph) S 10 SE 8 E 11
Mixing Hgt(ft-agl/msl)3090 3410
Transport Wnd (mph) S 12 E 14
Vent Rate (kt-ft) 30900 40920
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-190930-
Southwest Coastal Plains and Mona Island-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 40 20
Temp (24h trend) 90 (+3) 75 (-1) 90
RH % (24h trend) 56 (-8) 93 (+2) 52
Wind 20ft/early(mph) SE 9 E 6 SE 16 G21
Wind 20ft/late(mph) SE 9 E 6 SE 16 G21
Mixing Hgt(ft-agl/msl)4140 4580
Transport Wnd (mph) SE 7 E 14
Vent Rate (kt-ft) 24840 54960
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
VIZ001-190930-
Saint Thomas and Saint John-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Mcldy Mcldy Mclear
Precip Type Tstms Tstms Showers
Chance Precip (%) 60 60 40
Temp (24h trend) 86 (+1) 75 (-3) 85
RH % (24h trend) 71 (-6) 98 (+2) 69
Wind 20ft/early(mph) S 10 SE 9 E 12
Wind 20ft/late(mph) S 10 SE 9 E 12
Mixing Hgt(ft-agl/msl)3050 3340
Transport Wnd (mph) S 10 E 14
Vent Rate (kt-ft) 27450 40080
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-190930-
St Croix-
522 AM AST Sat Oct 18 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 40 20 10
Temp (24h trend) 88 (+2) 77 (-1) 87
RH % (24h trend) 70 (-7) 94 (0) 68
Wind 20ft/early(mph) SE 10 SE 9 E 12
Wind 20ft/late(mph) SE 10 SE 9 E 12
Mixing Hgt(ft-agl/msl)4180 3700
Transport Wnd (mph) S 12 E 15
Vent Rate (kt-ft) 41800 48100
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
$$