Weather Alerts for Pennsylvania
1. Extreme Cold Warning for: Mercer; Venango; Forest; Butler; Clarion; Jefferson; Armstrong; Westmoreland Ridges; Fayette Ridges; Indiana; Higher Elevations of Indiana; Eastern Preston; Eastern Tucker
2. Extreme Cold Warning for: Northern Erie; Southern Erie; Crawford
3. Extreme Cold Watch for: Carbon; Monroe
4. Extreme Cold Watch for: Southern Centre; Huntingdon; Mifflin; Juniata; Fulton; Franklin; Southern Clinton; Southern Lycoming; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster
5. Extreme Cold Watch for: Warren; McKean; Potter; Elk; Cameron; Northern Clinton; Clearfield; Northern Centre; Cambria; Blair; Somerset; Bedford; Tioga; Northern Lycoming; Sullivan
6. Winter Weather Advisory for: Cambria; Somerset
7. Winter Weather Advisory for: Southern Erie
8. Winter Weather Advisory for: Westmoreland Ridges; Fayette Ridges; Higher Elevations of Indiana; Ridges of Eastern Monongalia and Northwestern Preston; Preston; Eastern Preston; Western Tucker
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Current U.S. National Radar--Current
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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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