406 FNCA72 TJSJ 291120 FWSSJU Spot Forecast for Fosforo...PRFD National Weather Service San Juan PR 720 AM AST Mon Jun 29 2026 Forecast is based on forecast start time of 0800 AST on June 29. If conditions become unrepresentative...contact the National Weather Service. Please contact our office if you have questions or concerns with this forecast at PHONE: 787-253-4586. .DISCUSSION... A tropical wave moving across the area will increase the frequency of showers throughout the day. Late tonight into Tuesday, moderate to high concentrations of Saharan Dust will filter into the region, bringing hazy skies, reduced visibility, and poor air quality, with limited shower activity. Concentrations should lower by Wednesday afternoon. Breezy conditions are expected for the next few days. .REST OF TODAY... Sky/weather.........Mostly sunny (25-35 percent). Isolated showers. Chance of pcpn......20 percent. Max temperature.....Around 93. Min humidity........52 percent. Wind (20 ft)........Southeast winds 15 to 17 mph with gusts to around 30 mph. Mixing height.......3700 ft AGL. Transport winds.....Southeast 20 to 21 mph. Smoke dispersal.....Good (42000 knot-ft) early in the morning increasing to excellent (60100 knot-ft) in the afternoon. Dispersion..........6. Eye level winds.....Southeast winds 9 to 10 mph with gusts to around 18 mph. TIME (AST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........40 40 40 40 30 30 30 24 24 24 Weather cov.....ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO Weather type....RW RW RW RW RW RW RW RW RW RW Tstm cov........ Chc of pcpn (%).20 20 20 20 10 10 10 10 10 10 Temp............86 88 90 91 92 93 93 92 91 89 RH..............67 62 59 56 54 52 52 54 56 61 20 FT wind dir..SE SE SE SE SE SE SE SE SE SE 20 FT wind spd..15 16 17 17 17 17 17 17 17 17 20 FT wind gust.26 28 28 29 29 30 30 30 29 28 Eye lvl wnd dir.SE SE SE SE SE SE SE SE SE SE Eye lvl wnd spd.9 10 10 10 10 10 10 10 10 10 Eye lvl wnd gst.16 17 17 17 17 18 18 18 17 17 Mix hgt (kft)...2.7 3.2 3.6 3.7 3.6 3.4 3.1 3.0 2.8 2.5 Transp wind dir.E SE SE SE SE SE SE SE SE SE Transp wind spd.20 21 21 21 21 21 21 21 20 20 Dispersion......6 6 6 6 6 6 6 6 6 6 Vrate kt-ft/1K..60 60 60 60 60 60 42 42 42 42 Ventrate Cat....GD GD GD GD GD GD FR FR FR FR .TONIGHT... Sky/weather.........Mostly clear (10-20 percent). Haze through the night. Chance of pcpn......10 percent. Min temperature.....Around 76. Max humidity........86 percent. Wind (20 ft)........East winds 9 to 16 mph. Mixing height.......0 ft AGL. Transport winds.....East 9 to 18 mph. Smoke dispersal.....Good (42000 knot-ft) early in the evening decreasing to poor (6800 knot-ft) late in the night. Dispersion..........6. Eye level winds.....East winds 5 to 10 mph. TIME (AST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........14 14 14 5 5 5 25 25 25 5 5 5 Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF Weather type....HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 10 10 10 0 0 0 Temp............85 83 82 81 80 79 78 77 77 76 76 78 RH..............69 74 78 80 81 83 84 85 86 86 83 77 20 FT wind dir..SE E E E E E E E E E E E 20 FT wind spd..16 15 14 13 12 12 12 12 12 10 9 9 20 FT wind gust.26 24 23 22 20 13 13 13 13 12 10 10 Eye lvl wnd dir.SE E E E E E E E E E E E Eye lvl wnd spd.10 9 8 8 7 7 7 7 7 6 5 5 Eye lvl wnd gst.16 14 14 13 12 8 8 8 8 7 6 6 Mix hgt (kft)...2.0 1.4 0.9 0.7 0.5 0.5 0.4 0.4 0.3 0.1 0.1 0.2 Transp wind dir.SE E E E E E E E E E E E Transp wind spd.18 18 17 16 15 14 14 13 13 10 9 9 Dispersion......6 6 6 6 6 6 6 6 6 6 6 6 Vrate kt-ft/1K..42 42 7 7 7 7 7 7 7 7 7 7 Ventrate Cat....FR FR PR PR PR PR PR PR PR PR PR PR .TUESDAY... Sky/weather.........Sunny (20-30 percent). Haze through the day. Isolated showers in the late morning and afternoon. Chance of pcpn......20 percent. Max temperature.....Around 92. Min humidity........52 percent. Wind (20 ft)........East winds 10 to 17 mph with gusts to around 29 mph shifting to the southeast 17 to 22 mph with gusts to around 37 mph in the late morning and afternoon. Mixing height.......4600 ft AGL. Transport winds.....East 13 to 22 mph increasing to 21 to 28 mph in the late morning and afternoon. Smoke dispersal.....Poor (6800 knot-ft) early in the morning increasing to excellent (94100 knot-ft) in the afternoon. Dispersion..........6. Eye level winds.....East winds 6 to 10 mph with gusts to around 17 mph shifting to the southeast 10 to 13 mph with gusts to around 22 mph in the late morning and afternoon. TIME (AST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........6 6 6 25 25 25 40 40 40 40 40 40 Weather cov.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF Weather type....HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ Tstm cov........ Chc of pcpn (%).0 0 0 10 10 10 20 20 20 20 20 20 Temp............81 84 86 88 89 90 91 92 92 91 90 88 RH..............71 67 64 60 58 55 54 52 52 53 55 60 20 FT wind dir..E E E E SE SE SE SE SE SE SE SE 20 FT wind spd..10 13 15 17 20 21 22 22 22 20 18 17 20 FT wind gust.12 22 25 29 32 36 37 37 36 33 30 28 Eye lvl wnd dir.E E E E SE SE SE SE SE SE SE SE Eye lvl wnd spd.6 8 9 10 12 13 13 13 13 12 11 10 Eye lvl wnd gst.7 13 15 17 19 22 22 22 22 20 18 17 Mix hgt (kft)...1.1 2.2 3.3 3.9 4.3 4.5 4.6 4.5 4.3 4.1 3.8 3.4 Transp wind dir.E E E E E E E E E E E E Transp wind spd.13 17 22 25 26 28 28 26 25 24 22 21 Dispersion......6 6 6 6 6 6 6 6 6 6 6 6 Vrate kt-ft/1K..7 7 94 94 94 94 94 94 66 66 66 66 Ventrate Cat....PR PR GD GD GD GD GD GD GD GD GD GD $$ Forecaster...M. Novoa-Garcia Requested by...Jose M. Martinez Type of request...WILDFIRE .TAG 2616419.0/SJU .DELDT 06/29/26 .FormatterVersion 2.0.0 .EMAIL josemartin@dsp.pr.gov