Weather Alert in Pennsylvania
Flood Watch issued June 30 at 12:10PM EDT until June 30 at 10:00PM EDT by NWS State College PA
AREAS AFFECTED: Warren; McKean; Elk; Clearfield; Cambria; Somerset
DESCRIPTION: * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...The Northwest Mountains and Laurel Highlands of Pennsylvania, which includes the counties of Cambria, Clearfield, Elk, McKean, Somerset and Warren. * WHEN...Until 10 PM EDT this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Slow moving heavy showers and thunderstorms within a very moist airmass will interact with a warm front across the region and produce locally very heavy rain of 1 to 2 inches in less than one hour. Locations experiencing training of these showers and storms for over one hour, or multiple storms over a 2 to 3 hour period, will be under the greatest risk for flash flooding. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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Weather Topic: What is Sleet?
Home - Education - Precipitation - 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
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