Mon May 20 06:16:54 EDT 2024

Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
416 AM MDT Mon May 20 2024

.TODAY...
Sky/weather.........Partly cloudy then becoming mostly cloudy. 
                    Isolated rain showers and snow showers in the 
                    morning, then scattered rain showers, snow 
                    showers and isolated thunderstorms in the 
                    afternoon. Chance of precipitation 50 percent. 
Max temperature.....43-48. 
   24 hr trend......1 degree cooler. 
Min humidity........37-43 percent. 
   24 hr trend......4 percent wetter. 
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west 
                    around 10 mph. 
Ridge top winds.....East around 10 mph until 0900, then west. 
LAL.................1 until 1200, then 2. 
Chc of wetting rain.Zero percent until 1200, then 15 percent. 
Transport winds.....East around 10 mph until 0900, then southwest. 
Mixing Height.......600-800 ft agl until 0900. 5600-6400 ft agl 
                    after 1200. 
Smoke dispersal.....Poor until 1200, then good. 
Haines Index........3. 

.TONIGHT...
Sky/weather.........Mostly cloudy. Scattered rain showers and 
                    isolated thunderstorms early in the evening. 
                    Scattered snow showers through the night. 
                    Chance of precipitation 50 percent. 
Min temperature.....25-30. 
   24 hr trend......2 degrees warmer. 
Max humidity........85-91 percent. 
   24 hr trend......1 percent wetter. 
Humidity recovery...Excellent. 
20-foot winds.......Downslope/downvalley 4-7 mph. 
Ridge top winds.....North around 10 mph. 
LAL.................2 until 2400, then 1. 
Chc of wetting rain.25 percent until 2400, then 10 percent. 
Transport winds.....North around 15 mph. 
Mixing Height.......4000-4600 ft agl until 2100, then 800-1200 ft 
                    agl. 
Smoke dispersal.....Poor. 
Haines Index........3. 

.TUESDAY...
Sky/weather.........Mostly cloudy. Numerous snow showers through 
                    the day. Isolated thunderstorms in the 
                    afternoon. Scattered rain showers early in the 
                    afternoon. Snow accumulation up to 1 inch. 
                    Chance of precipitation 70 percent. 
Max temperature.....41-46. 
   24 hr trend......Unchanged. 
Min humidity........48-54 percent. 
   24 hr trend......8 percent wetter. 
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then north 
                    around 10 mph. 
Ridge top winds.....North 10 to 15 mph. 
LAL.................1 until 1200, then 2. 
Chc of wetting rain.10 percent until 1200, then 20 percent. 
Transport winds.....North 15 to 20 mph. 
Mixing Height.......600-800 ft agl until 0900. 4600-6000 ft agl 
                    after 1200. 
Smoke dispersal.....Fair to good. 
Haines Index........3. 


.Forecast days 3 through 7......
.TUESDAY NIGHT...Partly cloudy. Isolated showers, thunderstorms
and snow showers in the evening. Lows in the upper 20s. Winds
generally less than 10 mph. 
.WEDNESDAY...Mostly cloudy with snow showers with possible
showers and thunderstorms likely. Lows in the upper 20s. Highs in
the mid 40s. Southwest winds around 10 mph. 
.THURSDAY...Mostly cloudy with snow showers and slight chance of
thunderstorms. Lows in the mid 20s. Highs in the upper 30s.
Southwest winds around 10 mph. 
.FRIDAY...Mostly cloudy. Chance of showers, snow showers and
slight chance of thunderstorms. Lows in the upper 20s. Highs in
the mid 40s. Southwest winds around 10 mph. 
.SATURDAY THROUGH SUNDAY...Partly cloudy with chance of showers,
snow showers and slight chance of thunderstorms. Lows in the
upper 20s. Highs 46 to 51.