Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR

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809
FNCA52 TJSJ 130929
FWFSJU

Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
529 AM AST Mon Oct 13 2025

.DISCUSSION...

Today, easterly winds between around 10 to 15 mph with locally
higher values and gusts. Minimum relative humidity values are
expected to decrease a little compared to the last few days, but
should remain close or above the fire critical threshold. Expect a
typical weather pattern with afternoon convection confined across
western Puerto Rico. The fire danger threat is expected to remain
low today, however we will continue to monitor conditions.
Similar conditions are expected tomorrow, then moisture will
increase from mid week onward further decreasing the fire risk.

PRZ014-140930-
Southeast Coastal Plains-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     20           30           40
Temp (24h trend)      91 (+3)      74 (-2)      91
RH % (24h trend)      56 (-12)     94 (+4)      61
Wind 20ft/early(mph)  E 14 G19     NE 11        SE 13 G18
Wind 20ft/late(mph)   E 14 G19     NE 11        SE 13 G18
Mixing Hgt(ft-agl/msl)4600                      4320
Transport Wnd (mph)   E 15                      E 12
Vent Rate (kt-ft)     59800                     43200
Dispersion            5                         5
DSI                   6            3            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ015-140930-
Southern Hills-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Tstms
Chance Precip (%)     30           30           60
Temp (24h trend)      88 (+5)      70 (-3)      88
RH % (24h trend)      58 (-13)     98 (+6)      62
Wind 20ft/early(mph)  E 11         NE 11        SE 10
Wind 20ft/late(mph)   E 11         NE 11        SE 10
Mixing Hgt(ft-agl/msl)5180                      4910
Transport Wnd (mph)   E 15                      E 12
Vent Rate (kt-ft)     67340                     49100
Dispersion            5                         5
DSI                   5            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ016-140930-
North Coastal Plains-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Tstms
Chance Precip (%)     40           40           60
Temp (24h trend)      91 (+1)      74 (-1)      91
RH % (24h trend)      60 (-7)      98 (+5)      63
Wind 20ft/early(mph)  E 17 G19     E 14 G17     E 12
Wind 20ft/late(mph)   E 17 G19     E 14 G17     E 12
Mixing Hgt(ft-agl/msl)4830                      4680
Transport Wnd (mph)   E 14                      E 12
Vent Rate (kt-ft)     57960                     46800
Dispersion            5                         5
DSI                   6            5            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ017-140930-
Northern Hills-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     50           30           80
Temp (24h trend)      89 (+2)      71 (-2)      89
RH % (24h trend)      61 (-6)      98 (+3)      64
Wind 20ft/early(mph)  E 14         E 13         E 10
Wind 20ft/late(mph)   E 14         E 13         E 10
Mixing Hgt(ft-agl/msl)5330                      5140
Transport Wnd (mph)   E 12                      E  9
Vent Rate (kt-ft)     53300                     41120
Dispersion            5                         5
DSI                   5            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ018-140930-
West Coast-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     80           60           70
Temp (24h trend)      92 (+3)      72 (-2)      91
RH % (24h trend)      58 (-11)     97 (+3)      63
Wind 20ft/early(mph)  E 13         E 10         SE 10
Wind 20ft/late(mph)   E 13         E 10         SE 10
Mixing Hgt(ft-agl/msl)5000                      4520
Transport Wnd (mph)   SE 10                     SE  8
Vent Rate (kt-ft)     45000                     31640
Dispersion            5                         5
DSI                   5            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ019-140930-
Eastern Interior-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Tstms
Chance Precip (%)     40           50           50
Temp (24h trend)      89 (+3)      71 (-3)      90
RH % (24h trend)      61 (-7)      100 (+6)     63
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)4880                      4990
Transport Wnd (mph)   E 15                      SE 10
Vent Rate (kt-ft)     63440                     44910
Dispersion            5                         5
DSI                   6            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ022-140930-
Luquillo Mountain Range-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     50           50           50
Temp (24h trend)      85 (+4)      70 (-2)      86
RH % (24h trend)      66 (-10)     100 (+3)     68
Wind 20ft/early(mph)  E 11         E 10         SE 10
Wind 20ft/late(mph)   E 11         E 10         SE 10
Mixing Hgt(ft-agl/msl)4450                      4270
Transport Wnd (mph)   E 14                      E 12
Vent Rate (kt-ft)     53400                     42700
Dispersion            5                         5
DSI                   6            4            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ023-140930-
Central Mountain Range-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     70           40           90
Temp (24h trend)      87 (+5)      68 (-3)      87
RH % (24h trend)      59 (-13)     98 (+4)      65
Wind 20ft/early(mph)  E  9         E  9         SE  8
Wind 20ft/late(mph)   E  9         E  9         SE  8
Mixing Hgt(ft-agl/msl)6130                      5600
Transport Wnd (mph)   E 10                      SE  8
Vent Rate (kt-ft)     55170                     39200
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ024-140930-
Cayey Mountain Range-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     40           50           40
Temp (24h trend)      85 (+4)      70 (-2)      85
RH % (24h trend)      66 (-8)      100 (+3)     68
Wind 20ft/early(mph)  E 10         NE 10        SE  9
Wind 20ft/late(mph)   E 10         NE 10        SE  9
Mixing Hgt(ft-agl/msl)4770                      4550
Transport Wnd (mph)   E 15                      E 12
Vent Rate (kt-ft)     62010                     45500
Dispersion            5                         5
DSI                   6            3            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ025-140930-
Vieques-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     40           50           40
Temp (24h trend)      90 (+2)      76 (-1)      90
RH % (24h trend)      59 (-5)      97 (+8)      61
Wind 20ft/early(mph)  E 14 G18     E 14 G17     E 10
Wind 20ft/late(mph)   E 14 G18     E 14 G17     E 10
Mixing Hgt(ft-agl/msl)3640                      3410
Transport Wnd (mph)   E 20                      SE 10
Vent Rate (kt-ft)     61880                     30690
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ026-140930-
Culebra-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     40           50           40
Temp (24h trend)      92 (+3)      77 (-2)      92
RH % (24h trend)      57 (-9)      96 (+6)      59
Wind 20ft/early(mph)  E 14 G18     E 14 G19     E 11
Wind 20ft/late(mph)   E 14 G18     E 14 G19     E 11
Mixing Hgt(ft-agl/msl)3900                      3450
Transport Wnd (mph)   E 20                      E 13
Vent Rate (kt-ft)     66300                     37950
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ027-140930-
Southwest Coastal Plains and Mona Island-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Mclear       Mclear       Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     20           40           30
Temp (24h trend)      92 (+3)      74 (-2)      93
RH % (24h trend)      55 (-10)     92 (+4)      58
Wind 20ft/early(mph)  E 18 G24     E 13 G17     SE 14 G20
Wind 20ft/late(mph)   E 18 G24     E 13 G17     SE 14 G20
Mixing Hgt(ft-agl/msl)5050                      4980
Transport Wnd (mph)   E 17                      SE 13
Vent Rate (kt-ft)     75750                     54780
Dispersion            5                         5
DSI                   6            3            5
RH Recovery                        Excellent

Remarks...None.

$$

VIZ001-140930-
Saint Thomas and Saint John-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     40           40           40
Temp (24h trend)      87 (+1)      76 (-3)      87
RH % (24h trend)      63 (-7)      99 (+9)      65
Wind 20ft/early(mph)  E 13 G17     E 16 G20     E 11
Wind 20ft/late(mph)   E 13 G17     E 16 G20     E 11
Mixing Hgt(ft-agl/msl)3660                      3420
Transport Wnd (mph)   E 20                      E 13
Vent Rate (kt-ft)     62220                     37620
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

VIZ002-140930-
St Croix-
529 AM AST Mon Oct 13 2025

                      Today        Tonight      Tue

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Showers      Showers
Chance Precip (%)     40           50           40
Temp (24h trend)      90 (+3)      76 (-3)      89
RH % (24h trend)      63 (-6)      98 (+9)      63
Wind 20ft/early(mph)  E 13 G17     E 13 G17     E 11
Wind 20ft/late(mph)   E 13 G17     E 13 G17     E 11
Mixing Hgt(ft-agl/msl)4000                      4190
Transport Wnd (mph)   E 17                      E 13
Vent Rate (kt-ft)     60000                     46090
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$


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