Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
686
FNCA52 TJSJ 210705
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
305 AM AST Thu Aug 21 2025
.DISCUSSION...
Drier conditions are expected to prevail today and tomorrow.
However, east to southeasterly winds will maintain relative
humidities at least in the mid-50s. Since wetting rains were
observed in the last couple of days, the risk of fire spreading
will remain low.
PRZ014-220715-
Southeast Coastal Plains-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 0 10 30
Temp (24h trend) 93 (+3) 74 (-3) 91
RH % (24h trend) 54 (-15) 92 (+4) 60
Wind 20ft/early(mph) E 14 G20 NE 13 G17 E 13 G18
Wind 20ft/late(mph) E 14 G20 NE 13 G17 E 13 G18
Mixing Hgt(ft-agl/msl)5190 4640
Transport Wnd (mph) E 14 E 10
Vent Rate (kt-ft) 62280 41760
Dispersion 5 5
DSI 6 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-220715-
Southern Hills-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 10 10 20
Temp (24h trend) 89 (+4) 70 (-4) 88
RH % (24h trend) 59 (-12) 97 (+5) 63
Wind 20ft/early(mph) E 12 NE 11 E 11
Wind 20ft/late(mph) E 12 NE 11 E 11
Mixing Hgt(ft-agl/msl)5750 5110
Transport Wnd (mph) E 13 E 12
Vent Rate (kt-ft) 63250 51100
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-220715-
North Coastal Plains-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers None Tstms
Chance Precip (%) 10 0 20
Temp (24h trend) 91 (-1) 75 (-2) 89
RH % (24h trend) 61 (-3) 96 (+4) 66
Wind 20ft/early(mph) E 17 G19 E 16 G18 NE 13
Wind 20ft/late(mph) E 17 G19 E 16 G18 NE 13
Mixing Hgt(ft-agl/msl)4910 4370
Transport Wnd (mph) E 15 E 14
Vent Rate (kt-ft) 63830 52440
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ017-220715-
Northern Hills-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 10 10 10
Temp (24h trend) 90 (-1) 72 (-2) 89
RH % (24h trend) 58 (-3) 98 (+2) 64
Wind 20ft/early(mph) NE 14 E 14 NE 12
Wind 20ft/late(mph) NE 14 E 14 NE 12
Mixing Hgt(ft-agl/msl)5560 4840
Transport Wnd (mph) E 10 E 14
Vent Rate (kt-ft) 50040 58080
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ018-220715-
West Coast-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 30 20 10
Temp (24h trend) 93 (+1) 72 (-2) 93
RH % (24h trend) 56 (-8) 100 (+4) 58
Wind 20ft/early(mph) E 11 E 14 SE 14
Wind 20ft/late(mph) E 11 E 14 SE 14
Mixing Hgt(ft-agl/msl)5290 4760
Transport Wnd (mph) E 9 E 8
Vent Rate (kt-ft) 42320 33320
Dispersion 5 5
DSI 6 4 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-220715-
Eastern Interior-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Clear Pcldy
Precip Type Showers None Tstms
Chance Precip (%) 10 0 40
Temp (24h trend) 89 (+1) 72 (-3) 89
RH % (24h trend) 61 (-8) 97 (+3) 65
Wind 20ft/early(mph) E 12 NE 11 NE 11
Wind 20ft/late(mph) E 12 NE 11 NE 11
Mixing Hgt(ft-agl/msl)5570 4940
Transport Wnd (mph) E 14 E 13
Vent Rate (kt-ft) 66840 54340
Dispersion 5 5
DSI 6 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-220715-
Luquillo Mountain Range-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Clear Mcldy
Precip Type Showers None Tstms
Chance Precip (%) 20 0 60
Temp (24h trend) 85 (+4) 69 (-4) 84
RH % (24h trend) 68 (-12) 100 (+1) 73
Wind 20ft/early(mph) E 11 NE 9 NE 9
Wind 20ft/late(mph) E 11 NE 9 NE 9
Mixing Hgt(ft-agl/msl)4580 3700
Transport Wnd (mph) E 15 NE 13
Vent Rate (kt-ft) 59540 40700
Dispersion 5 5
DSI 6 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-220715-
Central Mountain Range-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 10 20 10
Temp (24h trend) 88 (+4) 69 (-3) 86
RH % (24h trend) 60 (-10) 98 (+3) 66
Wind 20ft/early(mph) E 9 NE 12 NE 9
Wind 20ft/late(mph) E 9 NE 12 NE 9
Mixing Hgt(ft-agl/msl)6470 5250
Transport Wnd (mph) E 8 E 10
Vent Rate (kt-ft) 45290 47250
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-220715-
Cayey Mountain Range-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Clear Pcldy
Precip Type Showers None Tstms
Chance Precip (%) 10 0 50
Temp (24h trend) 85 (+2) 70 (-3) 85
RH % (24h trend) 64 (-12) 100 (+3) 68
Wind 20ft/early(mph) E 11 NE 10 NE 10
Wind 20ft/late(mph) E 11 NE 10 NE 10
Mixing Hgt(ft-agl/msl)5060 4700
Transport Wnd (mph) E 16 E 13
Vent Rate (kt-ft) 70840 51700
Dispersion 5 5
DSI 6 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-220715-
Vieques-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Mcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 20 10 60
Temp (24h trend) 90 (+1) 77 (-1) 89
RH % (24h trend) 58 (-7) 90 (+1) 61
Wind 20ft/early(mph) E 13 G17 NE 14 G19 NE 11
Wind 20ft/late(mph) E 13 G17 NE 14 G19 NE 11
Mixing Hgt(ft-agl/msl)3830 3310
Transport Wnd (mph) E 18 NE 16
Vent Rate (kt-ft) 61280 46340
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-220715-
Culebra-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Mcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 20 10 60
Temp (24h trend) 91 (+2) 77 (-2) 91
RH % (24h trend) 58 (-11) 94 (+4) 62
Wind 20ft/early(mph) E 14 G18 NE 14 G18 NE 11
Wind 20ft/late(mph) E 14 G18 NE 14 G18 NE 11
Mixing Hgt(ft-agl/msl)4090 3140
Transport Wnd (mph) E 21 NE 15
Vent Rate (kt-ft) 73620 40820
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-220715-
Southwest Coastal Plains and Mona Island-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Mclear
Precip Type Showers Showers Showers
Chance Precip (%) 20 20 20
Temp (24h trend) 94 (+3) 74 (-3) 93
RH % (24h trend) 52 (-11) 92 (+5) 56
Wind 20ft/early(mph) SE 16 G21 E 12 SE 12 G17
Wind 20ft/late(mph) SE 16 G21 E 12 SE 12 G17
Mixing Hgt(ft-agl/msl)5540 4730
Transport Wnd (mph) E 15 E 8
Vent Rate (kt-ft) 72020 33110
Dispersion 5 5
DSI 6 3 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-220715-
Saint Thomas and Saint John-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Pcldy Mclear Mcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 20 20 60
Temp (24h trend) 88 (+2) 76 (-3) 87
RH % (24h trend) 63 (-9) 95 (+4) 67
Wind 20ft/early(mph) E 16 G19 NE 14 G19 NE 12
Wind 20ft/late(mph) E 16 G19 NE 14 G19 NE 12
Mixing Hgt(ft-agl/msl)3630 2940
Transport Wnd (mph) E 21 NE 17
Vent Rate (kt-ft) 65340 44100
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-220715-
St Croix-
305 AM AST Thu Aug 21 2025
Today Tonight Fri
Cloud Cover Mclear Mclear Pcldy
Precip Type Showers Showers Tstms
Chance Precip (%) 20 40 60
Temp (24h trend) 89 (+1) 77 (-2) 89
RH % (24h trend) 61 (-9) 93 (+3) 65
Wind 20ft/early(mph) E 14 G17 NE 14 G17 E 11
Wind 20ft/late(mph) E 14 G17 NE 14 G17 E 11
Mixing Hgt(ft-agl/msl)4060 3480
Transport Wnd (mph) E 17 E 14
Vent Rate (kt-ft) 60900 41760
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$