Weather Alert in Pennsylvania
Flash Flood Warning issued April 25 at 11:48PM EDT until April 26 at 2:45AM EDT by NWS Pittsburgh PA
AREAS AFFECTED: Armstrong, PA; Butler, PA; Clarion, PA; Forest, PA; Jefferson, PA; Venango, PA
DESCRIPTION: FFWPBZ The National Weather Service in Pittsburgh has issued a * Flash Flood Warning for... Forest County in northwestern Pennsylvania... Central Venango County in northwestern Pennsylvania... Northern Armstrong County in west central Pennsylvania... Northeastern Butler County in west central Pennsylvania... Clarion County in west central Pennsylvania... Northern Jefferson PA County in west central Pennsylvania... * Until 245 AM EDT. * At 1148 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1.5 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Oil City, Clarion, Brookville, Marienville, Knox, Sugarcreek, Brockway, New Bethlehem, Tionesta, Hasson Heights, Seneca, Parker, Sligo, Emlenton, Strattanville, Summerville, Bruin, Rouseville, Clintonville and Limestone.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.
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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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