Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
956
FNCA52 TJSJ 200921
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
521 AM AST Thu Nov 20 2025
.DISCUSSION...
Expect a occasional showers moving across the windward locations
today, followed by afternoon convection across the interior and
southwest PR. There is a slight risk of thunderstorms during the
afternoon hours across the interior and southwest PR. Winds
should remain from the east, between 8 - 15 mph with sea breeze
variations. RH values should remain above the critical thresholds.
Given the expected weather conditions, no fire weather is
expected today, hence, the threat will remain once again low.
PRZ014-210930-
Southeast Coastal Plains-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 80 60 40
Temp (24h trend) 88 (+1) 70 (-3) 88
RH % (24h trend) 53 (-8) 93 (+4) 49
Wind 20ft/early(mph) E 12 NE 9 E 12
Wind 20ft/late(mph) E 12 NE 9 E 12
Mixing Hgt(ft-agl/msl)4380 4940
Transport Wnd (mph) E 8 NE 8
Vent Rate (kt-ft) 30660 34580
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ015-210930-
Southern Hills-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 60 50
Temp (24h trend) 85 (+3) 67 (-3) 85
RH % (24h trend) 63 (-9) 97 (+4) 60
Wind 20ft/early(mph) E 10 NE 9 E 11
Wind 20ft/late(mph) E 10 NE 9 E 11
Mixing Hgt(ft-agl/msl)4590 4910
Transport Wnd (mph) E 9 E 9
Vent Rate (kt-ft) 36720 39280
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ016-210930-
North Coastal Plains-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 87 (+1) 71 (-2) 87
RH % (24h trend) 65 (-7) 97 (+2) 62
Wind 20ft/early(mph) NE 12 E 12 NE 13
Wind 20ft/late(mph) NE 12 E 12 NE 13
Mixing Hgt(ft-agl/msl)4200 4470
Transport Wnd (mph) E 12 E 13
Vent Rate (kt-ft) 42000 49170
Dispersion 5 5
DSI 6 5 6
RH Recovery Excellent
Remarks...None.
$$
PRZ017-210930-
Northern Hills-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 30 40
Temp (24h trend) 85 (+1) 68 (-3) 85
RH % (24h trend) 68 (-5) 98 (+2) 65
Wind 20ft/early(mph) NE 11 E 11 NE 11
Wind 20ft/late(mph) NE 11 E 11 NE 11
Mixing Hgt(ft-agl/msl)4530 4450
Transport Wnd (mph) E 10 E 12
Vent Rate (kt-ft) 40770 44500
Dispersion 5 5
DSI 5 4 6
RH Recovery Excellent
Remarks...None.
$$
PRZ018-210930-
West Coast-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 90 50 60
Temp (24h trend) 88 (+1) 68 (-3) 88
RH % (24h trend) 64 (-5) 99 (+3) 62
Wind 20ft/early(mph) E 13 NE 14 E 13
Wind 20ft/late(mph) E 13 NE 14 E 13
Mixing Hgt(ft-agl/msl)4020 4180
Transport Wnd (mph) E 6 E 9
Vent Rate (kt-ft) 20100 33440
Dispersion 5 5
DSI 5 3 5
RH Recovery Excellent
Remarks...None.
$$
PRZ019-210930-
Eastern Interior-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 60 50 50
Temp (24h trend) 86 (+3) 68 (-3) 86
RH % (24h trend) 65 (-8) 99 (+2) 62
Wind 20ft/early(mph) NE 9 NE 10 NE 10
Wind 20ft/late(mph) NE 9 NE 10 NE 10
Mixing Hgt(ft-agl/msl)4400 4860
Transport Wnd (mph) E 9 NE 9
Vent Rate (kt-ft) 35200 38880
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ022-210930-
Luquillo Mountain Range-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 60 50
Temp (24h trend) 82 (+4) 66 (-4) 82
RH % (24h trend) 70 (-9) 100 (+1) 68
Wind 20ft/early(mph) NE 8 NE 6 NE 9
Wind 20ft/late(mph) NE 8 NE 6 NE 9
Mixing Hgt(ft-agl/msl)3740 4170
Transport Wnd (mph) E 10 NE 10
Vent Rate (kt-ft) 33660 37530
Dispersion 5 5
DSI 5 3 6
RH Recovery Excellent
Remarks...None.
$$
PRZ023-210930-
Central Mountain Range-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms
Chance Precip (%) 70 40 50
Temp (24h trend) 84 (+4) 65 (-4) 84
RH % (24h trend) 68 (-8) 98 (+2) 65
Wind 20ft/early(mph) NE 11 NE 11 NE 10
Wind 20ft/late(mph) NE 11 NE 11 NE 10
Mixing Hgt(ft-agl/msl)4850 4580
Transport Wnd (mph) E 8 E 9
Vent Rate (kt-ft) 33950 36640
Dispersion 5 5
DSI 5 2 5
RH Recovery Excellent
Remarks...None.
$$
PRZ024-210930-
Cayey Mountain Range-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Showers
Chance Precip (%) 60 50 50
Temp (24h trend) 82 (+3) 67 (-2) 82
RH % (24h trend) 68 (-10) 100 (+1) 66
Wind 20ft/early(mph) NE 8 NE 8 NE 9
Wind 20ft/late(mph) NE 8 NE 8 NE 9
Mixing Hgt(ft-agl/msl)4320 4840
Transport Wnd (mph) E 10 NE 10
Vent Rate (kt-ft) 38880 43560
Dispersion 5 5
DSI 5 2 6
RH Recovery Excellent
Remarks...None.
$$
PRZ025-210930-
Vieques-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 87 (+1) 74 (-1) 86
RH % (24h trend) 63 (-4) 92 (-4) 61
Wind 20ft/early(mph) NE 11 NE 12 NE 11
Wind 20ft/late(mph) NE 11 NE 12 NE 11
Mixing Hgt(ft-agl/msl)3270 3800
Transport Wnd (mph) E 15 NE 14
Vent Rate (kt-ft) 42510 45600
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ026-210930-
Culebra-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 50 40
Temp (24h trend) 88 (+1) 75 (-1) 88
RH % (24h trend) 61 (-6) 92 (-2) 59
Wind 20ft/early(mph) NE 11 NE 12 NE 11
Wind 20ft/late(mph) NE 11 NE 12 NE 11
Mixing Hgt(ft-agl/msl)3340 3820
Transport Wnd (mph) NE 13 E 16
Vent Rate (kt-ft) 36740 53480
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
PRZ027-210930-
Southwest Coastal Plains and Mona Island-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms
Chance Precip (%) 80 70 60
Temp (24h trend) 90 (+2) 69 (-4) 89
RH % (24h trend) 52 (-6) 96 (+6) 49
Wind 20ft/early(mph) E 11 NE 17 G20 SE 12
Wind 20ft/late(mph) E 11 NE 17 G20 SE 12
Mixing Hgt(ft-agl/msl)4470 4590
Transport Wnd (mph) E 6 E 7
Vent Rate (kt-ft) 22350 27540
Dispersion 5 5
DSI 4 1 5
RH Recovery Excellent
Remarks...None.
$$
VIZ001-210930-
Saint Thomas and Saint John-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Pcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 50 40 30
Temp (24h trend) 86 (+1) 74 (-1) 86
RH % (24h trend) 65 (-6) 95 (0) 62
Wind 20ft/early(mph) NE 11 NE 12 NE 12
Wind 20ft/late(mph) NE 11 NE 12 NE 12
Mixing Hgt(ft-agl/msl)3340 3760
Transport Wnd (mph) NE 14 E 15
Vent Rate (kt-ft) 40080 48880
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
VIZ002-210930-
St Croix-
521 AM AST Thu Nov 20 2025
Today Tonight Fri
Cloud Cover Mcldy Pcldy Pcldy
Precip Type Tstms Showers Showers
Chance Precip (%) 60 30 40
Temp (24h trend) 87 (+1) 74 (-2) 87
RH % (24h trend) 66 (-4) 92 (-2) 64
Wind 20ft/early(mph) E 11 NE 12 NE 12
Wind 20ft/late(mph) E 11 NE 12 NE 12
Mixing Hgt(ft-agl/msl)3740 4060
Transport Wnd (mph) E 14 E 15
Vent Rate (kt-ft) 44880 52780
Dispersion 5 5
DSI 6 6 6
RH Recovery Excellent
Remarks...None.
$$
$$