Mon May 20 14:46:08 EDT 2024

Northern Black Hills-
Including Lead, Deadwood, and Rochford
1245 PM MDT Mon May 20 2024

.TONIGHT...
Sky/weather.........Cloudy. Rain showers and slight chance of snow 
                    showers in the evening, then chance of rain 
                    showers and snow showers after midnight. 
Chc of wetting rain.60 percent. 
LAL.................1. 
Min temperature.....32-38. 
Max humidity........94-100 percent. 
20-foot winds.......East around 5 mph shifting to the northeast 
                    after midnight. 
Haines Index........2 very low potential for large plume dominated 
                    fire growth. 
Transport winds.....East around 15 mph. 
Smoke dispersal.....Poor. 
Mixing height.......300 to 400 ft agl. 

.TUESDAY...
Sky/weather.........Mostly cloudy. Rain showers with snow showers 
                    likely in the morning, then rain showers likely 
                    and slight chance of thunderstorms in the 
                    afternoon. 
Chc of wetting rain.70 percent. 
LAL.................1 until 1200, then 3. 
Max temperature.....42-50. 
Min humidity........60-76 percent. 
20-foot winds.......North 5 to 10 mph with gusts to around 20 mph. 
Haines Index........3 very low potential for large plume dominated 
                    fire growth. 
Transport winds.....North around 15 mph. 
Smoke dispersal.....Fair. 
Mixing height.......3000 to 3800 ft agl. 

.TUESDAY NIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy. 
                    Chance of showers and thunderstorms in the 
                    evening. Chance of snow showers through the 
                    night. Slight chance of showers and 
                    thunderstorms after midnight. 
Chc of wetting rain.30 percent. 
LAL.................3 until 2400, then 2. 
Min temperature.....30-36. 
Max humidity........86-100 percent. 
20-foot winds.......West 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.....West 15 to 20 mph. 
Smoke dispersal.....Poor. 
Mixing height.......200 to 300 ft agl. 

.WEDNESDAY...
Sky/weather.........Sunny. Slight chance of rain showers in the 
                    morning, then chance of rain showers and slight 
                    chance of thunderstorms in the afternoon. 
Chc of wetting rain.20 percent. 
LAL.................1 until 1200, then 2. 
Max temperature.....54-62. 
Min humidity........30-38 percent. 
20-foot winds.......Southwest 5 to 10 mph. 
                    Gusts to around 20 mph in the afternoon. 
Haines Index........5 moderate potential for large plume dominated 
                    fire growth. 
Transport winds.....Southwest around 25 mph increasing to 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. Slight chance of showers. Lows in the
lower 40s. Highs in the lower 60s. Southwest winds 10 to 15 mph. 
.FRIDAY...Partly cloudy. Chance of showers, snow showers and
slight chance of thunderstorms. Lows in the lower 30s. Highs in
the mid 50s. West winds 15 to 20 mph. 
.SATURDAY...Warmer. Mostly clear. Chance of showers and slight
chance of thunderstorms. Lows in the upper 30s. Highs in the mid
60s. Southwest winds around 10 mph. 
.SUNDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows around 40. Highs in the upper 50s. 
.MEMORIAL DAY...Partly cloudy. Chance of showers and slight
chance of thunderstorms. Lows in the upper 30s. Highs in the
upper 50s.