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

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462
FNCA52 TJSJ 040647
FWFSJU

Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
247 AM AST Sat Oct 4 2025

.DISCUSSION...

Another day with light and variable winds between 5 to 10 mph.
Relative humidity trend suggests values near to below thresholds
over the southern coastal plains of Puerto Rico (near 55%),
showers and thunderstorms are expected over the mountain ranges
into southern portions of Puerto Rico in the afternoon. At this
time, the fire danger threat will remain low today.


PRZ014-050700-
Southeast Coastal Plains-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     60           40           30
Temp (24h trend)      91 (+1)      73 (-1)      91
RH % (24h trend)      58 (-2)      95 (+4)      60
Wind 20ft/early(mph)  SE  9        NE  6        SE 11
Wind 20ft/late(mph)   SE  9        NE  6        SE 11
Mixing Hgt(ft-agl/msl)4290                      3690
Transport Wnd (mph)   SE  6                     SE  9
Vent Rate (kt-ft)     21450                     29520
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ015-050700-
Southern Hills-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     70           30           40
Temp (24h trend)      88 (+3)      70 (-1)      88
RH % (24h trend)      60 (-3)      98 (+4)      62
Wind 20ft/early(mph)  SE  6        Lgt/Var      SE  9
Wind 20ft/late(mph)   SE  6        Lgt/Var      SE  9
Mixing Hgt(ft-agl/msl)5380                      4220
Transport Wnd (mph)   E  6                      SE  7
Vent Rate (kt-ft)     26900                     25320
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ016-050700-
North Coastal Plains-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     70           40           60
Temp (24h trend)      90 (+1)      73 (-1)      91
RH % (24h trend)      62 (-2)      98 (+3)      63
Wind 20ft/early(mph)  E 10         SE  8        E 11
Wind 20ft/late(mph)   E 10         SE  8        E 11
Mixing Hgt(ft-agl/msl)4560                      3760
Transport Wnd (mph)   E  7                      E  9
Vent Rate (kt-ft)     27360                     30080
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ017-050700-
Northern Hills-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     90           20           70
Temp (24h trend)      88 (+1)      70 (-2)      89
RH % (24h trend)      62 (-2)      98 (+2)      64
Wind 20ft/early(mph)  E  8         Lgt/Var      NE  8
Wind 20ft/late(mph)   E  8         Lgt/Var      NE  8
Mixing Hgt(ft-agl/msl)5400                      3260
Transport Wnd (mph)   E  5                      NE  5
Vent Rate (kt-ft)     21600                     13040
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ018-050700-
West Coast-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        None         Tstms
Chance Precip (%)     70           0            50
Temp (24h trend)      91 (+1)      72 (-1)      91
RH % (24h trend)      60 (-2)      97 (+3)      63
Wind 20ft/early(mph)  SE  6        Lgt/Var      E  9
Wind 20ft/late(mph)   SE  6        Lgt/Var      E  9
Mixing Hgt(ft-agl/msl)4570                      3220
Transport Wnd (mph)   SE  3                     S  6
Vent Rate (kt-ft)     13710                     16100
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ019-050700-
Eastern Interior-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Mcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     80           50           40
Temp (24h trend)      89 (+2)      71 (-1)      89
RH % (24h trend)      62 (-1)      99 (+2)      63
Wind 20ft/early(mph)  E  8         E  6         E  9
Wind 20ft/late(mph)   E  8         E  6         E  9
Mixing Hgt(ft-agl/msl)5420                      4930
Transport Wnd (mph)   SE  6                     SE  8
Vent Rate (kt-ft)     27100                     34510
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ022-050700-
Luquillo Mountain Range-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Mcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     80           50           50
Temp (24h trend)      84 (+2)      69 (-2)      86
RH % (24h trend)      67 (-2)      100 (0)      67
Wind 20ft/early(mph)  E  8         E  5         E  9
Wind 20ft/late(mph)   E  8         E  5         E  9
Mixing Hgt(ft-agl/msl)4780                      4230
Transport Wnd (mph)   SE  7                     SE 10
Vent Rate (kt-ft)     28680                     38070
Dispersion            5                         5
DSI                   4            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ023-050700-
Central Mountain Range-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        Showers      Tstms
Chance Precip (%)     90           10           60
Temp (24h trend)      87 (+4)      68 (-2)      87
RH % (24h trend)      63 (-3)      98 (+2)      65
Wind 20ft/early(mph)  Lgt/Var      Lgt/Var      E  5
Wind 20ft/late(mph)   Lgt/Var      Lgt/Var      E  5
Mixing Hgt(ft-agl/msl)5960                      4400
Transport Wnd (mph)   SE  3                     S  5
Vent Rate (kt-ft)     17880                     17600
Dispersion            5                         5
DSI                   4            1            4
RH Recovery                        Excellent

Remarks...None.

$$

PRZ024-050700-
Cayey Mountain Range-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     70           50           30
Temp (24h trend)      85 (+1)      69 (-1)      85
RH % (24h trend)      64 (-1)      100 (+1)     66
Wind 20ft/early(mph)  E  6         Lgt/Var      SE  8
Wind 20ft/late(mph)   E  6         Lgt/Var      SE  8
Mixing Hgt(ft-agl/msl)4560                      4470
Transport Wnd (mph)   SE  7                     SE  8
Vent Rate (kt-ft)     27360                     31290
Dispersion            5                         5
DSI                   5            1            5
RH Recovery                        Excellent

Remarks...None.

$$

PRZ025-050700-
Vieques-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Mcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     60           40           50
Temp (24h trend)      90 (+1)      76 (-1)      90
RH % (24h trend)      60 (+2)      96 (+5)      58
Wind 20ft/early(mph)  E  6         E  8         E  8
Wind 20ft/late(mph)   E  6         E  8         E  8
Mixing Hgt(ft-agl/msl)3380                      3250
Transport Wnd (mph)   E  8                      E  8
Vent Rate (kt-ft)     23660                     22750
Dispersion            5                         5
DSI                   6            5            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ026-050700-
Culebra-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Mcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     60           40           50
Temp (24h trend)      92 (+2)      76 (-2)      92
RH % (24h trend)      57 (-4)      96 (+5)      57
Wind 20ft/early(mph)  E  6         E  8         E  9
Wind 20ft/late(mph)   E  6         E  8         E  9
Mixing Hgt(ft-agl/msl)3050                      3350
Transport Wnd (mph)   SE  7                     E 10
Vent Rate (kt-ft)     18300                     30150
Dispersion            5                         5
DSI                   6            5            6
RH Recovery                        Excellent

Remarks...None.

$$

PRZ027-050700-
Southwest Coastal Plains and Mona Island-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Mclear       Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     50           10           30
Temp (24h trend)      92 (+1)      74 (-1)      92
RH % (24h trend)      56 (-1)      93 (+6)      58
Wind 20ft/early(mph)  SE  9        E  6         SE 12 G17
Wind 20ft/late(mph)   SE  9        E  6         SE 12 G17
Mixing Hgt(ft-agl/msl)4740                      4050
Transport Wnd (mph)   SE  6                     SE 10
Vent Rate (kt-ft)     23700                     36450
Dispersion            5                         5
DSI                   5            2            5
RH Recovery                        Excellent

Remarks...None.

$$

VIZ001-050700-
Saint Thomas and Saint John-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     50           40           50
Temp (24h trend)      87 (+1)      75 (-3)      88
RH % (24h trend)      64 (-2)      100 (+9)     63
Wind 20ft/early(mph)  E  6         E  8         E  9
Wind 20ft/late(mph)   E  6         E  8         E  9
Mixing Hgt(ft-agl/msl)3200                      3350
Transport Wnd (mph)   E  6                      E 10
Vent Rate (kt-ft)     16000                     30150
Dispersion            5                         5
DSI                   6            5            6
RH Recovery                        Excellent

Remarks...None.

$$

VIZ002-050700-
St Croix-
247 AM AST Sat Oct 4 2025

                      Today        Tonight      Sun

Cloud Cover           Pcldy        Pcldy        Pcldy
Precip Type           Tstms        Showers      Showers
Chance Precip (%)     50           40           50
Temp (24h trend)      90 (+2)      75 (-3)      90
RH % (24h trend)      64 (-2)      98 (+6)      63
Wind 20ft/early(mph)  E  6         E  8         E  8
Wind 20ft/late(mph)   E  6         E  8         E  8
Mixing Hgt(ft-agl/msl)4220                      4350
Transport Wnd (mph)   E  8                      E  9
Vent Rate (kt-ft)     29540                     34800
Dispersion            5                         5
DSI                   6            5            6
RH Recovery                        Excellent

Remarks...None.

$$


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