Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
027
FNCA52 TJSJ 300851
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
451 AM AST Sat Aug 30 2025
.DISCUSSION...
The overall fire weather threat remains low today, with any risk
expected to be of limited duration and spatial extent. Wind
speeds are expected to, in general, remain close to threshold
values. Trailing moisture will continue to maintain RH values
generally above threshold values. KBDI values are at 584 in Cabo
Rojo, 535 in Guanica, and 724 at St. Croix. Conditions will
continue to be monitored closely throughout the day for any
changes.
PRZ014-310900-
Southeast Coastal Plains-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 20 20
Temp (24h trend) 93 (+3) 73 (-4) 92
RH % (24h trend) 52 (-7) 95 (+5) 52
Wind 20ft/early(mph) SE 14 G19 E 9 SE 12
Wind 20ft/late(mph) SE 14 G19 E 9 SE 12
Mixing Hgt(ft-agl/msl)4640 4300
Transport Wnd (mph) E 10 E 12
Vent Rate (kt-ft) 41760 43000
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ015-310900-
Southern Hills-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 50 40
Temp (24h trend) 89 (+3) 69 (-5) 89
RH % (24h trend) 60 (-9) 100 (+4) 60
Wind 20ft/early(mph) SE 10 NE 9 SE 10
Wind 20ft/late(mph) SE 10 NE 9 SE 10
Mixing Hgt(ft-agl/msl)5270 4960
Transport Wnd (mph) E 9 E 12
Vent Rate (kt-ft) 42160 49600
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-310900-
North Coastal Plains-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 30 30
Temp (24h trend) 91 (+1) 73 (-4) 91
RH % (24h trend) 63 (-6) 100 (+4) 61
Wind 20ft/early(mph) E 13 E 12 E 13
Wind 20ft/late(mph) E 13 E 12 E 13
Mixing Hgt(ft-agl/msl)4750 4590
Transport Wnd (mph) E 9 E 12
Vent Rate (kt-ft) 38000 45900
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ017-310900-
Northern Hills-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 70 50 50
Temp (24h trend) 89 (+1) 70 (-4) 89
RH % (24h trend) 64 (-5) 100 (+1) 64
Wind 20ft/early(mph) E 11 E 10 NE 11
Wind 20ft/late(mph) E 11 E 10 NE 11
Mixing Hgt(ft-agl/msl)5470 5110
Transport Wnd (mph) E 7 SE 9
Vent Rate (kt-ft) 32820 40880
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ018-310900-
West Coast-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Mclear Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 70 60
Temp (24h trend) 92 (+1) 71 (-4) 92
RH % (24h trend) 61 (-4) 100 (+3) 60
Wind 20ft/early(mph) E 9 E 12 E 11
Wind 20ft/late(mph) E 9 E 12 E 11
Mixing Hgt(ft-agl/msl)4630 4480
Transport Wnd (mph) SE 6 SE 8
Vent Rate (kt-ft) 23150 31360
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-310900-
Eastern Interior-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 70 20 30
Temp (24h trend) 90 (+2) 70 (-5) 90
RH % (24h trend) 59 (-8) 100 (+2) 59
Wind 20ft/early(mph) E 11 E 10 E 10
Wind 20ft/late(mph) E 11 E 10 E 10
Mixing Hgt(ft-agl/msl)5740 5260
Transport Wnd (mph) E 9 SE 10
Vent Rate (kt-ft) 45920 47340
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-310900-
Luquillo Mountain Range-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 70 30 50
Temp (24h trend) 86 (+4) 68 (-4) 86
RH % (24h trend) 65 (-10) 100 (0) 65
Wind 20ft/early(mph) E 9 E 8 E 10
Wind 20ft/late(mph) E 9 E 8 E 10
Mixing Hgt(ft-agl/msl)4700 4680
Transport Wnd (mph) E 9 SE 10
Vent Rate (kt-ft) 37600 42120
Dispersion 5 5
DSI 6 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ023-310900-
Central Mountain Range-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 90 70 70
Temp (24h trend) 87 (+4) 67 (-5) 87
RH % (24h trend) 65 (-8) 100 (+1) 65
Wind 20ft/early(mph) E 6 E 9 SE 8
Wind 20ft/late(mph) E 6 E 9 SE 8
Mixing Hgt(ft-agl/msl)6120 5520
Transport Wnd (mph) E 6 SE 8
Vent Rate (kt-ft) 30600 38640
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-310900-
Cayey Mountain Range-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 70 20 30
Temp (24h trend) 86 (+2) 68 (-4) 86
RH % (24h trend) 61 (-10) 100 (0) 61
Wind 20ft/early(mph) E 9 E 6 E 9
Wind 20ft/late(mph) E 9 E 6 E 9
Mixing Hgt(ft-agl/msl)5200 4780
Transport Wnd (mph) E 10 E 10
Vent Rate (kt-ft) 46800 43020
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ025-310900-
Vieques-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 40 30 40
Temp (24h trend) 90 (+1) 75 (-2) 90
RH % (24h trend) 57 (-7) 97 (+1) 58
Wind 20ft/early(mph) E 9 E 12 E 11
Wind 20ft/late(mph) E 9 E 12 E 11
Mixing Hgt(ft-agl/msl)3420 3400
Transport Wnd (mph) E 10 E 13
Vent Rate (kt-ft) 30780 37400
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-310900-
Culebra-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 40 30 30
Temp (24h trend) 92 (+2) 76 (-3) 92
RH % (24h trend) 58 (-8) 99 (+4) 59
Wind 20ft/early(mph) E 10 E 12 E 11
Wind 20ft/late(mph) E 10 E 12 E 11
Mixing Hgt(ft-agl/msl)3360 3420
Transport Wnd (mph) E 12 E 14
Vent Rate (kt-ft) 33600 41040
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-310900-
Southwest Coastal Plains and Mona Island-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 40 50 40
Temp (24h trend) 93 (+2) 74 (-4) 93
RH % (24h trend) 52 (-5) 94 (+4) 52
Wind 20ft/early(mph) SE 13 G18 E 11 SE 16 G21
Wind 20ft/late(mph) SE 13 G18 E 11 SE 16 G21
Mixing Hgt(ft-agl/msl)4750 4810
Transport Wnd (mph) E 9 E 15
Vent Rate (kt-ft) 38000 62530
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-310900-
Saint Thomas and Saint John-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 30 30 20
Temp (24h trend) 89 (+3) 74 (-4) 89
RH % (24h trend) 63 (-9) 100 (+7) 63
Wind 20ft/early(mph) E 10 E 12 E 11
Wind 20ft/late(mph) E 10 E 12 E 11
Mixing Hgt(ft-agl/msl)3370 3400
Transport Wnd (mph) E 13 E 15
Vent Rate (kt-ft) 37070 44200
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-310900-
St Croix-
451 AM AST Sat Aug 30 2025
Today Tonight Sun
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Showers Showers Showers
Chance Precip (%) 20 50 30
Temp (24h trend) 90 (+2) 77 (-3) 90
RH % (24h trend) 61 (-8) 94 (+4) 62
Wind 20ft/early(mph) E 11 E 12 E 11
Wind 20ft/late(mph) E 11 E 12 E 11
Mixing Hgt(ft-agl/msl)4080 4410
Transport Wnd (mph) E 14 E 14
Vent Rate (kt-ft) 48960 52920
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$