


Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
842 FNCA52 TJSJ 170844 FWFSJU Fire Weather Planning Forecast for Puerto Rico National Weather Service San Juan PR 444 AM AST Thu Jul 17 2025 .DISCUSSION... Lingering moisture from a tropical wave will result in showers and isolated thunderstorms today, especially across the interior and western Puerto Rico during the afternoon hours. Minimum relative humidities are expected to generally remain above critical fire weather levels, however, in some areas across the southern coastal plains of Puerto Rico values in the mid 50s are possible. Accompanied with breezy winds may increase the fire risk if those areas do not receive heavy rain. PRZ014-180845- Southeast Coastal Plains- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Mclear Mclear Mclear Precip Type Showers Showers Showers Chance Precip (%) 20 10 10 Temp (24h trend) 92 (+2) 75 (-2) 92 RH % (24h trend) 52 (-10) 90 (-1) 54 Wind 20ft/early(mph) E 17 G23 E 14 G20 E 17 G22 Wind 20ft/late(mph) E 17 G23 E 14 G20 E 17 G22 Mixing Hgt(ft-agl/msl)4600 5560 Transport Wnd (mph) E 18 E 16 Vent Rate (kt-ft) 73600 77840 Dispersion 5 5 DSI 6 4 6 RH Recovery Excellent Remarks...None. $$ PRZ015-180845- Southern Hills- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Mclear Mclear Precip Type Tstms Showers Tstms Chance Precip (%) 40 10 30 Temp (24h trend) 88 (+4) 71 (-3) 88 RH % (24h trend) 56 (-14) 94 (0) 61 Wind 20ft/early(mph) E 13 E 11 E 12 Wind 20ft/late(mph) E 13 E 11 E 12 Mixing Hgt(ft-agl/msl)5100 5660 Transport Wnd (mph) E 17 E 14 Vent Rate (kt-ft) 76500 67920 Dispersion 5 5 DSI 6 3 6 RH Recovery Excellent Remarks...None. $$ PRZ016-180845- North Coastal Plains- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Pcldy Precip Type Tstms Showers Showers Chance Precip (%) 50 40 30 Temp (24h trend) 89 (+2) 75 (-2) 89 RH % (24h trend) 58 (-16) 93 (-4) 66 Wind 20ft/early(mph) E 20 E 18 E 17 G20 Wind 20ft/late(mph) E 20 E 18 E 17 G20 Mixing Hgt(ft-agl/msl)4060 4500 Transport Wnd (mph) E 20 E 15 Vent Rate (kt-ft) 69020 58500 Dispersion 5 5 DSI 6 6 6 RH Recovery Excellent Remarks...None. $$ PRZ017-180845- Northern Hills- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Pcldy Precip Type Tstms Showers Tstms Chance Precip (%) 60 20 40 Temp (24h trend) 89 (+4) 72 (-2) 87 RH % (24h trend) 58 (-17) 96 (-3) 69 Wind 20ft/early(mph) E 18 E 16 NE 16 Wind 20ft/late(mph) E 18 E 16 NE 16 Mixing Hgt(ft-agl/msl)5040 5200 Transport Wnd (mph) E 16 E 12 Vent Rate (kt-ft) 70560 52000 Dispersion 5 5 DSI 6 5 6 RH Recovery Excellent Remarks...None. $$ PRZ018-180845- West Coast- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Mclear Pcldy Precip Type Tstms Showers Tstms Chance Precip (%) 50 20 60 Temp (24h trend) 92 (+2) 72 (-2) 92 RH % (24h trend) 54 (-13) 99 (+2) 62 Wind 20ft/early(mph) E 14 E 12 E 12 Wind 20ft/late(mph) E 14 E 12 E 12 Mixing Hgt(ft-agl/msl)4120 4960 Transport Wnd (mph) E 12 E 9 Vent Rate (kt-ft) 41200 39680 Dispersion 5 5 DSI 6 5 6 RH Recovery Excellent Remarks...None. $$ PRZ019-180845- Eastern Interior- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Pcldy Precip Type Tstms Showers Showers Chance Precip (%) 50 40 40 Temp (24h trend) 87 (+3) 72 (-3) 88 RH % (24h trend) 62 (-13) 94 (-3) 65 Wind 20ft/early(mph) E 13 E 13 E 11 Wind 20ft/late(mph) E 13 E 13 E 11 Mixing Hgt(ft-agl/msl)5210 5590 Transport Wnd (mph) E 16 E 13 Vent Rate (kt-ft) 72940 61490 Dispersion 5 5 DSI 6 4 6 RH Recovery Excellent Remarks...None. $$ PRZ022-180845- Luquillo Mountain Range- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Pcldy Precip Type Tstms Showers Showers Chance Precip (%) 60 60 60 Temp (24h trend) 82 (+4) 70 (-3) 83 RH % (24h trend) 71 (-15) 98 (-1) 74 Wind 20ft/early(mph) E 11 E 11 E 10 Wind 20ft/late(mph) E 11 E 11 E 10 Mixing Hgt(ft-agl/msl)3320 4230 Transport Wnd (mph) E 17 E 13 Vent Rate (kt-ft) 49800 46530 Dispersion 5 5 DSI 6 5 6 RH Recovery Excellent Remarks...None. $$ PRZ023-180845- Central Mountain Range- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Mclear Pcldy Precip Type Tstms Showers Tstms Chance Precip (%) 60 0 70 Temp (24h trend) 86 (+5) 69 (-2) 86 RH % (24h trend) 56 (-21) 96 (-3) 69 Wind 20ft/early(mph) E 10 E 10 E 9 Wind 20ft/late(mph) E 10 E 10 E 9 Mixing Hgt(ft-agl/msl)6120 6260 Transport Wnd (mph) E 13 E 8 Vent Rate (kt-ft) 67320 43820 Dispersion 5 5 DSI 5 2 5 RH Recovery Excellent Remarks...None. $$ PRZ024-180845- Cayey Mountain Range- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Mclear Precip Type Tstms Showers Showers Chance Precip (%) 50 30 20 Temp (24h trend) 83 (+3) 71 (-2) 83 RH % (24h trend) 67 (-11) 97 (-3) 70 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)4290 5380 Transport Wnd (mph) E 18 E 15 Vent Rate (kt-ft) 68640 69940 Dispersion 5 5 DSI 6 4 6 RH Recovery Excellent Remarks...None. $$ PRZ025-180845- Vieques- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Mclear Pcldy Precip Type Showers Showers Showers Chance Precip (%) 40 20 60 Temp (24h trend) 89 (+2) 77 (-1) 88 RH % (24h trend) 61 (-8) 85 (-7) 61 Wind 20ft/early(mph) E 14 G19 E 16 G20 E 13 Wind 20ft/late(mph) E 14 G19 E 16 G20 E 13 Mixing Hgt(ft-agl/msl)2520 3030 Transport Wnd (mph) E 20 E 16 Vent Rate (kt-ft) 42840 42420 Dispersion 5 5 DSI 6 6 6 RH Recovery Excellent Remarks...None. $$ PRZ026-180845- Culebra- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Pcldy Precip Type Showers Showers Showers Chance Precip (%) 40 30 40 Temp (24h trend) 91 (+3) 79 (0) 90 RH % (24h trend) 58 (-12) 84 (-7) 62 Wind 20ft/early(mph) E 16 G19 E 17 G21 E 13 G17 Wind 20ft/late(mph) E 16 G19 E 17 G21 E 13 G17 Mixing Hgt(ft-agl/msl)2610 3110 Transport Wnd (mph) E 20 E 15 Vent Rate (kt-ft) 44370 40430 Dispersion 5 5 DSI 6 6 6 RH Recovery Excellent Remarks...None. $$ PRZ027-180845- Southwest Coastal Plains and Mona Island- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Mclear Mclear Mclear Precip Type Showers None Showers Chance Precip (%) 10 0 30 Temp (24h trend) 92 (+2) 75 (-2) 92 RH % (24h trend) 53 (-8) 92 (+4) 56 Wind 20ft/early(mph) SE 20 G26 E 16 G21 E 17 G22 Wind 20ft/late(mph) SE 20 G26 E 16 G21 E 17 G22 Mixing Hgt(ft-agl/msl)4570 5500 Transport Wnd (mph) E 18 E 17 Vent Rate (kt-ft) 73120 82500 Dispersion 5 5 DSI 6 5 6 RH Recovery Excellent Remarks...None. $$ VIZ001-180845- Saint Thomas and Saint John- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Pcldy Mclear Precip Type Showers Showers Showers Chance Precip (%) 30 30 30 Temp (24h trend) 86 (+1) 76 (-3) 86 RH % (24h trend) 66 (-8) 88 (-7) 67 Wind 20ft/early(mph) E 17 G21 E 17 G21 E 13 G17 Wind 20ft/late(mph) E 17 G21 E 17 G21 E 13 G17 Mixing Hgt(ft-agl/msl)2650 3140 Transport Wnd (mph) E 21 E 17 Vent Rate (kt-ft) 47700 47100 Dispersion 5 5 DSI 6 6 6 RH Recovery Excellent Remarks...None. $$ VIZ002-180845- St Croix- 444 AM AST Thu Jul 17 2025 Today Tonight Fri Cloud Cover Pcldy Mclear Mclear Precip Type Showers Showers Showers Chance Precip (%) 30 20 10 Temp (24h trend) 89 (+3) 77 (-2) 87 RH % (24h trend) 62 (-11) 82 (-10) 65 Wind 20ft/early(mph) E 17 G20 E 16 G19 E 13 Wind 20ft/late(mph) E 17 G20 E 16 G19 E 13 Mixing Hgt(ft-agl/msl)3740 4520 Transport Wnd (mph) E 22 E 15 Vent Rate (kt-ft) 71060 58760 Dispersion 5 5 DSI 6 6 6 RH Recovery Excellent Remarks...None. $$ $$