Forecast Details for Penn Yan, NY

Recent Locations: Esparto, CA Cerro, NM Penn Yan, NY

This Afternoon: A chance of rain, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 66. South wind 16 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight: Rain and possibly a thunderstorm. Low around 44. Southwest wind 10 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 55. West wind 10 to 13 mph.

Sunday Night: Increasing clouds, with a low around 40. Southwest wind around 10 mph.

Monday: Sunny, with a high near 66. Southwest wind 10 to 16 mph, with gusts as high as 26 mph.

Monday Night: Mostly clear, with a low around 44.

Tuesday: Mostly sunny, with a high near 64.

Tuesday Night: Rain likely after 1am. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.

Wednesday: Rain. High near 65. Chance of precipitation is 80%.

Wednesday Night: Rain likely before 1am, then rain and snow likely. Cloudy, with a low around 30. Chance of precipitation is 60%.

Thursday: A chance of snow. Mostly cloudy, with a high near 37. Breezy. Chance of precipitation is 30%.

Thursday Night: Mostly cloudy, with a low around 23.

Friday: A chance of rain and snow. Partly sunny, with a high near 43. Chance of precipitation is 40%.

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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 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

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds