Forecast Details for Roundup, MT

Recent Locations: Arroyo Grande, CA Sterling, NY Roundup, MT

Overnight: Areas of smoke. Partly cloudy, with a low around 55. Calm wind becoming west southwest 5 to 9 mph.

Thursday: Areas of smoke before 3pm. Mostly sunny, with a high near 74. West southwest wind 11 to 16 mph becoming north northwest 19 to 24 mph in the morning.

Thursday Night: Mostly clear, with a low around 39. North northwest wind 15 to 20 mph becoming light and variable after midnight.

Friday: Sunny, with a high near 72. Calm wind becoming northeast around 6 mph in the afternoon.

Friday Night: Mostly clear, with a low around 39. Northeast wind around 6 mph becoming calm in the evening.

Saturday: Sunny, with a high near 76. Calm wind becoming east southeast around 6 mph in the afternoon.

Saturday Night: Mostly clear, with a low around 41. East wind 5 to 7 mph becoming calm after midnight.

Sunday: Mostly sunny, with a high near 85. Calm wind becoming south southwest around 5 mph.

Sunday Night: Mostly cloudy, with a low around 53. Southeast wind around 5 mph becoming calm in the evening.

Monday: Mostly sunny, with a high near 87. West southwest wind 3 to 5 mph.

Monday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Northeast wind around 6 mph becoming calm in the evening.

Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Calm wind becoming east around 6 mph in the afternoon.

Tuesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53. East wind around 6 mph becoming calm in the evening.

Wednesday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle

Weather Topic: What is Evaporation?

Home - Education - Precipitation - Evaporation

Next Topic: Fog

Evaporation is the process which returns water from the earth back to the atmosphere, and is another crucial process in the water cycle.

Evaporation is the transformation of liquid into gas, and it happens because molecules are excited by the application of energy and turn into vapor. In order for water to evaporate it has to be on the surface of a body of water.

Next Topic: Fog