Weather Alert in Pennsylvania
Winter Storm Watch issued February 21 at 1:01PM EST until February 24 at 7:00AM EST by NWS Cleveland OH
AREAS AFFECTED: Northern Erie; Southern Erie
DESCRIPTION: * WHAT...Heavy lake enhanced snow possible. Potential for 6 inches or more of accumulation. * WHERE...Northern Erie and Southern Erie Counties. * WHEN...From Sunday evening through Tuesday morning. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning and evening commutes. * ADDITIONAL DETAILS...Light snow will spread into the region Sunday with minimal accumulations, mainly on grassy surfaces. Heavier lake enhanced snow will develop late Sunday evening, with periods of heavy snowfall possible Sunday night into Monday night.
INSTRUCTION: Monitor the latest forecasts for updates on this situation.
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North America Water Vapor (Moisture)
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - 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
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