Mon May 20 14:46:08 EDT 2024

Central Black Hills-
Including Custer, Hill City, and Keystone
1245 PM MDT Mon May 20 2024

.TONIGHT...
Sky/weather.........Cloudy. Rain showers, slight chance of 
                    thunderstorms and snow showers in the evening, 
                    then chance of rain showers and snow showers 
                    after midnight. 
Chc of wetting rain.70 percent. 
LAL.................2 until 2400, then 1. 
Min temperature.....33-39. 
Max humidity........95-100 percent. 
20-foot winds.......Northeast 5 to 10 mph. 
                    Gusts to around 20 mph after midnight. 
Haines Index........2 very low potential for large plume dominated 
                    fire growth. 
Transport winds.....Northeast around 15 mph. 
Smoke dispersal.....Poor. 
Mixing height.......400 to 500 ft agl. 

.TUESDAY...
Sky/weather.........Mostly cloudy. Slight chance of snow showers in 
                    the morning. Rain showers likely through the 
                    day. Slight chance of thunderstorms in the 
                    afternoon. 
Chc of wetting rain.60 percent. 
LAL.................1 until 1200, then 3. 
Max temperature.....44-52. 
Min humidity........60-72 percent. 
20-foot winds.......North 10 to 15 mph with gusts to around 25 mph. 
Haines Index........3 very low potential for large plume dominated 
                    fire growth. 
Transport winds.....North around 20 mph. 
Smoke dispersal.....Fair. 
Mixing height.......3100 to 3900 ft agl. 

.TUESDAY NIGHT...
Sky/weather.........Mostly cloudy. Chance of rain showers and snow 
                    showers in the evening. Slight chance of 
                    thunderstorms through the night. Slight chance 
                    of rain showers after midnight. 
Chc of wetting rain.30 percent. 
LAL.................3 until 2400, then 2. 
Min temperature.....31-37. 
Max humidity........89-100 percent. 
20-foot winds.......Northwest 5 to 10 mph. 
                    Gusts to around 20 mph in the evening. 
Haines Index........2 very low potential for large plume dominated 
                    fire growth. 
Transport winds.....Northwest around 15 mph. 
Smoke dispersal.....Poor. 
Mixing height.......200 to 300 ft agl. 

.WEDNESDAY...
Sky/weather.........Sunny. Slight chance of rain showers. 
Chc of wetting rain.10 percent. 
LAL.................1. 
Max temperature.....55-63. 
Min humidity........30-36 percent. 
20-foot winds.......Southwest 5 to 10 mph. 
                    Gusts to around 25 mph in the afternoon. 
Haines Index........5 moderate potential for large plume dominated 
                    fire growth. 
Transport winds.....West around 25 mph increasing to southwest 
                    around 35 mph in the afternoon. 
Smoke dispersal.....Good increasing to excellent in the afternoon. 
Mixing height.......6900 to 8700 ft agl. 


.FORECAST DAYS 3 THROUGH 7...
.THURSDAY...Partly cloudy. Chance of showers. Lows in the lower
40s. Highs in the lower 60s. Southwest winds 10 to 20 mph. 
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 30s. Highs in the mid 50s. West
winds around 15 mph. 
.SATURDAY...Warmer. Mostly clear. Slight chance of showers. Lows
in the upper 30s. Highs in the upper 60s. Southwest winds 10 to
15 mph. 
.SUNDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 40s. Highs around 60. 
.MEMORIAL DAY...Mostly clear. Chance of showers and slight chance
of thunderstorms. Lows around 40. Highs in the lower 60s.