Forecast Details for West Mifflin, PA

Recent Locations: West Mifflin, PA

Current Alerts for West Mifflin, PA: Flood Warning

Overnight: A slight chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 5am. Cloudy, with a low around 63. Calm wind. Chance of precipitation is 20%.

Saturday: A slight chance of showers before 2pm, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 78. Northwest wind 3 to 5 mph. Chance of precipitation is 20%.

Saturday Night: A chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 62. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8am. High near 73. South wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 61. Southwest wind 6 to 8 mph. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.

Monday: Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday Night: Showers likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.

Tuesday: A chance of showers. Partly sunny, with a high near 75. Chance of precipitation is 50%.

Tuesday Night: Mostly clear, with a low around 57.

Wednesday: Mostly sunny, with a high near 77.

Wednesday Night: Mostly clear, with a low around 58.

Thursday: Sunny, with a high near 82.

Thursday Night: Partly cloudy, with a low around 61.

Friday: Mostly sunny, with a high near 84.

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North America Water Vapor (Moisture)

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Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow