Spot Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
830
FNUS71 KLWX 252051
FWSLWX
Spot Forecast for Rattlesnake Run...USFS
National Weather Service Baltimore MD/Washington DC
451 PM EDT Fri Apr 25 2025
Forecast is based on forecast start time of 0600 EDT on April 26.
If conditions become unrepresentative...contact the National Weather
Service.
Please contact our office if you have questions
or concerns with this forecast.
.DISCUSSION...
Occasional showers will remain possible through the morning hours
tomorrow, although much of the time should remain dry. Rainfall totals
tonight through the day tomorrow are generally expected to be between
a quarter and a half of an inch. Skies clear out tomorrow afternoon,
leading to mostly sunny skies during the afternoon. Winds will pick up
out of the west to northwest during the afternoon, with gusts of
20-30 mph possible. Minimum RH values are expected to be around 50-55
percent.
Winds should remain gusty out of the northwest tomorrow night, but
conditions will remain dry. RH values rebound to around 75 percent.
On Sunday, sunny skies are expected, with winds remaining elevated
out of the northwest, and conditions drying out over the course of
the day. Gusts of 20-30 mph will be possible once again. Minimum RH
values will be around 25 percent.
.SATURDAY...
Sky/weather.........Mostly cloudy (70-80 percent) then becoming
mostly sunny (35-45 percent). Patchy fog early
in the morning. Isolated rain showers.
CWR.................20 percent decreasing to 0 percent late in the
afternoon.
Chance of thunder...12 percent.
Max temperature.....Around 73.
Min humidity........53 percent.
Wind (20 ft)........West winds 10 to 13 mph shifting to the
northwest 13 to 15 mph in the afternoon. Gusts
up to 26 mph.
Mixing height.......4600 ft AGL.
Transport winds.....West 15 to 24 mph shifting to the northwest
around 25 mph late in the afternoon.
Smoke dispersal.....Poor (7900 knot-ft) early in the morning
increasing to excellent (100700 knot-ft) in the
afternoon.
Eye level winds.....West winds 6 to 8 mph shifting to the northwest
8 to 9 mph in the afternoon. Gusts up to 26
mph.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........87 85 82 80 79 77 64 49 47 41 35 29
Weather cov.....ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO
Weather type....RNF RNF RW RW RW RW RW RW RW RW RW
Tstm cov........
CWR.............20 20 20 20 20 20 20 20 20 20 20 0
Chc of thdr (%).0 0 10 10 10 10 10 10 10 10 10 0
Temp............58 58 59 61 63 66 69 71 71 73 71 69
RH..............93 93 90 87 84 73 63 61 57 53 55 55
20 FT wind dir..SW W W W W W W W W NW NW NW
20 FT wind spd..10 10 10 10 12 12 13 13 14 14 15 15
20 FT wind gust.21 21 22 22 22 22 22 22 23 24 25 26
Eye lvl wnd dir.SW W W W W W W W W NW NW NW
Eye lvl wnd spd.6 6 6 6 7 7 8 8 8 8 9 9
Eye lvl wnd gst.13 13 13 13 13 13 13 13 14 14 15 16
Mix hgt (kft)...0.6 0.8 1.2 1.5 2.4 2.8 3.3 3.8 4.5 4.6 4.3 3.7
Transp wind dir.W W W W W W W W W W W NW
Transp wind spd.15 16 18 17 20 21 21 22 24 25 25 25
Vrate kt-ft/1K..8 11 20 22 40 51 59 72 94 101 94 82
Ventrate Cat....PR PR PR PR FR FR FR GD GD VGD GD GD
.SATURDAY NIGHT...
Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of thunder...4 percent.
Min temperature.....Around 39.
Max humidity........76 percent.
Wind (20 ft)........Northwest winds 9 to 15 mph. Gusts up to 26 mph
in the evening and overnight.
Mixing height.......600 ft AGL.
Transport winds.....Northwest 20 to 28 mph decreasing to around 18
mph after 3 am.
Smoke dispersal.....Excellent (75800 knot-ft) early in the evening
decreasing to poor (9600 knot-ft) late in the
night.
Eye level winds.....Northwest winds 5 to 9 mph. Gusts up to 26 mph
in the evening and overnight.
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
Sky (%).........22 15 15 14 12 22
Weather cov.....
Weather type....NONE NONE NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0
Temp............66 56 51 47 42 39
RH..............56 66 71 71 73 76
20 ft wind......NW 15 NW 13 NW 12 NW 10 NW 10 NW 9
20 ft wind gust.26 25 24 23 22 17
Eye level wind..NW 9 NW 8 NW 7 NW 6 NW 6 NW 5
Eye lvl wnd gst.16 15 14 14 13 10
Mix hgt (ft)....3300 2100 1200 1100 1000 600
Transport wind..NW 26 NW 26 NW 22 NW 22 NW 21 NW 18
Vrate kt-ft/1K..76 49 22 21 18 10
Ventrate Cat....GOOD FAIR POOR POOR POOR POOR
.SUNDAY...
Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 66.
Min humidity........25 percent.
Wind (20 ft)........Northwest winds around 10 mph. Gusts up to 25
mph in the late morning and afternoon.
Mixing height.......4600 ft AGL.
Transport winds.....Northwest 15 to 24 mph.
Smoke dispersal.....Fair (15000 knot-ft) early in the morning
increasing to excellent (75500 knot-ft) in the
afternoon.
Eye level winds.....Northwest winds around 6 mph. Gusts up to 25
mph in the late morning and afternoon.
TIME (EDT) 6 AM 9 AM NOON 3 PM
Sky (%).........29 28 15 6
Weather cov.....
Weather type....NONE NONE NONE NONE
Tstm cov........
CWR.............0 0 0 0
Chc of thdr (%).0 0 0 0
Temp............39 45 58 65
RH..............70 55 34 26
20 FT wind......NW 10G16 NW 10G21 NW 10G25 N 10G22
Eye level wind..NW 6G10 NW 6G13 NW 6G15 N 6G13
Mix hgt (ft)....800 2000 3200 4400
Transport wind..NW 21 NW 24 N 22 N 20
Vrate kt-ft/1K..15 43 62 76
Ventrate Cat....POOR FAIR GOOD GOOD
$$
Forecaster...Pallozzi
Requested by...Collett
Type of request...WILDFIRE
.TAG 2511815.0/LWX
.DELDT 04/25/25
.FormatterVersion 2.0.0
.EMAIL jay.collett@usda.gov