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

Home |  Current Version |  Previous Version |  Text Only |  Print | Product List |  Glossary On
Versions: 1 2 3
476
FNCA52 TJSJ 160935
FWFSJU

Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
535 AM AST Thu Oct 16 2025

.DISCUSSION...

Like yesterday, there is LOW fire weather threat across the
vulnerable areas. During the overnight hours showers and
thunderstorms filtered across the all coastal and fire hot spot
increasing moisture/rainfall activity today across the area.

PRZ014-170945-
Southeast Coastal Plains-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Showers      Tstms        Tstms
Chance Precip (%)     40           40           60
Temp (24h trend)      88 (-1)      74 (-1)      89
RH % (24h trend)      66 (+7)      95 (+1)      65
Wind 20ft/early(mph)  SW 14 G19    W  9         SW 12 G17
Wind 20ft/late(mph)   SW 14 G19    W  9         SW 12 G17
Mixing Hgt(ft-agl/msl)4600                      4840
Transport Wnd (mph)   SW 14                     SW 10
Vent Rate (kt-ft)     55200                     43560
Dispersion            5                         5
DSI                   6            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ015-170945-
Southern Hills-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Mcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     50           50           70
Temp (24h trend)      84 (0)       70 (-3)      85
RH % (24h trend)      69 (0)       98 (+4)      69
Wind 20ft/early(mph)  SW 12        SW 10        SW 10
Wind 20ft/late(mph)   SW 12        SW 10        SW 10
Mixing Hgt(ft-agl/msl)4870                      5270
Transport Wnd (mph)   SW 15                     SW 12
Vent Rate (kt-ft)     63310                     52700
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ016-170945-
North Coastal Plains-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     80           20           90
Temp (24h trend)      90 (-1)      73 (-2)      89
RH % (24h trend)      63 (0)       97 (+3)      65
Wind 20ft/early(mph)  SW 14 G17    SW 11        W 12
Wind 20ft/late(mph)   SW 14 G17    SW 11        W 12
Mixing Hgt(ft-agl/msl)5270                      4860
Transport Wnd (mph)   SW 13                     SW  8
Vent Rate (kt-ft)     57970                     34020
Dispersion            5                         5
DSI                   6            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ017-170945-
Northern Hills-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Mcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     60           40           90
Temp (24h trend)      87 (-1)      72 (-1)      87
RH % (24h trend)      66 (+2)      98 (+3)      66
Wind 20ft/early(mph)  SW 14        SW 11        SW 12
Wind 20ft/late(mph)   SW 14        SW 11        SW 12
Mixing Hgt(ft-agl/msl)5480                      5470
Transport Wnd (mph)   SW 16                     SW 12
Vent Rate (kt-ft)     76720                     54700
Dispersion            5                         5
DSI                   5            3            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ018-170945-
West Coast-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Mcldy        Mcldy        Pcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     60           70           60
Temp (24h trend)      87 (-3)      73 (-2)      88
RH % (24h trend)      70 (+3)      99 (+4)      70
Wind 20ft/early(mph)  SW 13        S 11         SW 11
Wind 20ft/late(mph)   SW 13        S 11         SW 11
Mixing Hgt(ft-agl/msl)4500                      4550
Transport Wnd (mph)   SW 16                     S 12
Vent Rate (kt-ft)     63000                     45500
Dispersion            5                         5
DSI                   6            4            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ019-170945-
Eastern Interior-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     80           20           70
Temp (24h trend)      87 (-1)      72 (-1)      88
RH % (24h trend)      65 (0)       99 (+3)      66
Wind 20ft/early(mph)  SW 13        SW 11        SW 11
Wind 20ft/late(mph)   SW 13        SW 11        SW 11
Mixing Hgt(ft-agl/msl)5330                      5690
Transport Wnd (mph)   SW 14                     SW 12
Vent Rate (kt-ft)     63960                     56900
Dispersion            5                         5
DSI                   6            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ022-170945-
Luquillo Mountain Range-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     90           10           70
Temp (24h trend)      84 (+2)      69 (-2)      84
RH % (24h trend)      69 (-4)      100 (+1)     71
Wind 20ft/early(mph)  SW  9        SW  5        SW  8
Wind 20ft/late(mph)   SW  9        SW  5        SW  8
Mixing Hgt(ft-agl/msl)4780                      4770
Transport Wnd (mph)   SW 12                     SW 12
Vent Rate (kt-ft)     47800                     47700
Dispersion            5                         5
DSI                   6            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ023-170945-
Central Mountain Range-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Mcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     60           50           80
Temp (24h trend)      84 (+1)      69 (-3)      84
RH % (24h trend)      72 (+2)      98 (+3)      69
Wind 20ft/early(mph)  SW 13        SW 10        SW 10
Wind 20ft/late(mph)   SW 13        SW 10        SW 10
Mixing Hgt(ft-agl/msl)5360                      5840
Transport Wnd (mph)   SW 16                     SW 13
Vent Rate (kt-ft)     75040                     64240
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ024-170945-
Cayey Mountain Range-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     60           30           50
Temp (24h trend)      84 (+1)      70 (-1)      83
RH % (24h trend)      71 (0)       100 (+1)     71
Wind 20ft/early(mph)  SW 11        SW  8        SW 10
Wind 20ft/late(mph)   SW 11        SW  8        SW 10
Mixing Hgt(ft-agl/msl)4760                      5070
Transport Wnd (mph)   SW 15                     SW 13
Vent Rate (kt-ft)     61880                     55770
Dispersion            5                         5
DSI                   6            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ025-170945-
Vieques-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     50           20           40
Temp (24h trend)      88 (0)       76 (0)       88
RH % (24h trend)      64 (+1)      98 (+3)      67
Wind 20ft/early(mph)  SW 16 G20    SW 13        SW 13 G17
Wind 20ft/late(mph)   SW 16 G20    SW 13        SW 13 G17
Mixing Hgt(ft-agl/msl)3480                      3250
Transport Wnd (mph)   SW 20                     SW 15
Vent Rate (kt-ft)     59160                     42250
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ026-170945-
Culebra-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     60           10           50
Temp (24h trend)      90 (0)       76 (-2)      90
RH % (24h trend)      61 (-3)      98 (+4)      64
Wind 20ft/early(mph)  SW 16 G20    SW 13 G18    SW 13 G17
Wind 20ft/late(mph)   SW 16 G20    SW 13 G18    SW 13 G17
Mixing Hgt(ft-agl/msl)3470                      3160
Transport Wnd (mph)   SW 20                     SW 16
Vent Rate (kt-ft)     58990                     44240
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ027-170945-
Southwest Coastal Plains and Mona Island-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Mcldy        Mcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     50           70           60
Temp (24h trend)      89 (-1)      75 (-2)      89
RH % (24h trend)      65 (+8)      95 (+6)      64
Wind 20ft/early(mph)  SW 16 G20    SW 11        SW 12
Wind 20ft/late(mph)   SW 16 G20    SW 11        SW 12
Mixing Hgt(ft-agl/msl)4850                      5050
Transport Wnd (mph)   SW 14                     SW 10
Vent Rate (kt-ft)     58200                     45450
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

VIZ001-170945-
Saint Thomas and Saint John-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Mcldy        Pcldy        Pcldy
Precip Type           Tstms        Tstms        Tstms
Chance Precip (%)     60           50           60
Temp (24h trend)      85 (-1)      75 (-3)      86
RH % (24h trend)      69 (0)       100 (+6)     71
Wind 20ft/early(mph)  SW 16 G19    SW 13        SW 13 G17
Wind 20ft/late(mph)   SW 16 G19    SW 13        SW 13 G17
Mixing Hgt(ft-agl/msl)4110                      3300
Transport Wnd (mph)   SW 20                     SW 16
Vent Rate (kt-ft)     69870                     46200
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$

VIZ002-170945-
St Croix-
535 AM AST Thu Oct 16 2025

                      Today        Tonight      Fri

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     50           40           50
Temp (24h trend)      86 (-2)      75 (-2)      88
RH % (24h trend)      70 (+3)      100 (+5)     70
Wind 20ft/early(mph)  SW 13 G17    SW 11        SW 12
Wind 20ft/late(mph)   SW 13 G17    SW 11        SW 12
Mixing Hgt(ft-agl/msl)4550                      3950
Transport Wnd (mph)   SW 18                     S 16
Vent Rate (kt-ft)     72800                     55300
Dispersion            5                         5
DSI                   6            6            6
RH Recovery                        Excellent

Remarks...None.

$$


$$