Spot Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
394
FNCA72 TJSJ 190906
FWSSJU
Spot Forecast for Bike Trail...PRFD
National Weather Service San Juan PR
506 AM AST Sun Jul 19 2026
Forecast is based on forecast start time of 0800 AST on July 19.
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...
Once again, a Fire Danger Statement (RFD) was issued for today.
Elevated fire weather conditions are expected across the southern
coastal plains and hills of Puerto Rico. Prolonged rainfall
deficits, abnormally dry to severe drought conditions, and
critically dry fuels continue, with KBDI values remaining above
critical thresholds. Although a weak tropical wave approaching
from the east will result in a slight increase in low-level
moisture later today, the deepest moisture is expected to remain
well south of the local islands, with little impact on fire
weather conditions through most of the day.
Relative humidity values are still forecast to fall into the upper
40s to lower 50s this afternoon across the southern coastal plains
of Puerto Rico and adjacent lower elevations, while easterly to east-
northeasterly winds of 15 to 20 mph with higher gusts will continue
to support elevated fire weather conditions. Any rainfall associated
with the tropical wave is expected to be light and localized,
providing little to no meaningful relief to the ongoing dry
conditions.
.TODAY...
Sky/weather.........Sunny (15-25 percent).
Chance of pcpn......10 percent.
Max temperature.....Around 93.
Min humidity........50 percent.
Wind (20 ft)........East winds 5 to 14 mph. Gusts up to 28 mph in
the late morning and afternoon.
Mixing height.......4400 ft AGL.
Transport winds.....East 6 to 15 mph increasing to 10 to 17 mph
late in the morning.
Smoke dispersal.....Poor (1400 knot-ft) early in the morning
increasing to good (43400 knot-ft) in the
afternoon.
Dispersion..........4.
Eye level winds.....East winds up to 10 mph. Gusts up to 28 mph in
the late morning and afternoon.
TIME (AST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 21 21 21 30 30 30 30 30 30
Weather cov..... ISO ISO ISO ISO ISO ISO
Weather type.... RW RW RW RW RW RW
Tstm cov........
Chc of pcpn (%).0 0 0 0 10 10 10 10 10 10
Temp............86 88 90 92 92 93 93 92 91 89
RH..............55 52 51 50 50 50 51 51 53 57
20 FT wind dir..E E E E E SE SE SE E E
20 FT wind spd..7 9 13 15 16 16 16 14 12 10
20 FT wind gust.8 10 21 25 28 28 26 23 20 12
Eye lvl wnd dir.E E E E E SE SE SE E E
Eye lvl wnd spd.4 5 8 9 10 10 10 8 7 6
Eye lvl wnd gst.5 6 13 15 17 17 16 14 12 7
Mix hgt (kft)...1.5 2.6 3.7 4.4 4.3 3.8 3.2 3.1 3.0 2.7
Transp wind dir.E E E E E E E E E E
Transp wind spd.10 13 15 16 17 17 16 14 12 10
Dispersion......6 6 6 6 6 6 6 6 6 6
Vrate kt-ft/1K..43 43 43 43 43 43 27 27 27 27
Ventrate Cat....FR FR FR FR FR FR PR PR PR PR
.TONIGHT...
Sky/weather.........Mostly clear (10-20 percent). Haze in the late
evening and overnight.
Chance of pcpn......10 percent.
Min temperature.....Around 75.
Max humidity........81 percent.
Wind (20 ft)........East winds 5 to 8 mph.
Mixing height.......100 ft AGL.
Transport winds.....East 6 to 12 mph shifting to the northeast 5 to
6 mph after 3 am.
Smoke dispersal.....Fair (26800 knot-ft) early in the evening
decreasing to poor (1100 knot-ft) late in the
night.
Dispersion..........4.
Eye level winds.....East winds up to 6 mph.
TIME (AST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........1 1 1 14 14 14 14 14 14 25 25 25
Weather cov..... DEF DEF DEF DEF DEF DEF DEF DEF DEF
Weather type.... HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ HAZ
Tstm cov........
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 10 10 10
Temp............85 83 81 80 79 78 77 76 76 75 75 77
RH..............65 72 76 78 79 79 79 79 80 81 81 76
20 FT wind dir..E E E E E E E E E E E E
20 FT wind spd..9 9 10 9 7 6 6 6 6 6 6 6
20 FT wind gust.10 10 12 10 8 7 7 7 7 7 7 7
Eye lvl wnd dir.E E E E E E E E E E E E
Eye lvl wnd spd.5 5 6 5 4 4 4 4 4 4 4 4
Eye lvl wnd gst.6 6 7 6 5
Mix hgt (kft)...2.0 1.1 0.5 0.2 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.2
Transp wind dir.E E E E E E E NE NE NE NE NE
Transp wind spd.10 12 12 10 8 6 6 6 6 6 5 5
Dispersion......6 6 3 3 3 3 3 3 2 2 2 2
Vrate kt-ft/1K..27 27 2 2 2 2 2 2 1 1 1 1
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
.MONDAY...
Sky/weather.........Sunny (20-30 percent). Haze through the day.
Chance of pcpn......10 percent.
Max temperature.....Around 92.
Min humidity........51 percent.
Wind (20 ft)........East winds around 5 mph early in the morning
becoming light, then becoming east 5 to 12 mph
early in the morning.
Mixing height.......4200 ft AGL.
Transport winds.....East 6 to 10 mph increasing to 9 to 15 mph in
the late morning and afternoon.
Smoke dispersal.....Poor (1100 knot-ft) early in the morning
increasing to good (33200 knot-ft) in the
afternoon.
Dispersion..........4.
Eye level winds.....East winds around 3 mph increasing to up to 8
mph early in the morning.
TIME (AST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........23 23 23 20 20 20 26 26 26 29 29 29
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 (%).10 10 10 0 0 0 10 10 10 10 10 10
Temp............80 83 85 88 89 91 91 92 92 91 90 88
RH..............69 63 58 55 54 53 52 51 51 53 55 60
20 FT wind dir..E E E E E SE SE SE SE SE E E
20 FT wind spd..5 5 5 8 10 13 14 14 13 10 8 7
20 FT wind gust.6 6 6 9 12 22 23 23 21 12 9 8
Eye lvl wnd dir.E E E E E SE SE SE SE SE E E
Eye lvl wnd spd.3 3 3 5 6 8 8 8 8 6 5 4
Eye lvl wnd gst.4 4 4 7 13 14 14 13 7 5
Mix hgt (kft)...0.3 0.6 1.2 2.2 3.4 4.2 4.1 3.6 3.2 3.3 3.5 3.4
Transp wind dir.NE E E E E E E SE SE E E E
Transp wind spd.6 7 8 10 13 14 15 15 14 13 10 9
Dispersion......2 2 6 6 6 6 6 6 6 6 6 6
Vrate kt-ft/1K..1 1 33 33 33 33 33 33 25 25 25 25
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
$$
Forecaster...C. Villanueva-Birriel
Requested by...Jose M. Martinez
Type of request...WILDFIRE
.TAG 2617461.3/SJU
.DELDT 07/19/26
.FormatterVersion 2.0.0
.EMAIL josemartin@dsp.pr.gov