Weather Alert in Oregon
Severe Thunderstorm Warning issued September 6 at 5:26PM PDT until September 6 at 6:30PM PDT by NWS Portland OR
AREAS AFFECTED: Clackamas, OR; Marion, OR
DESCRIPTION: SVRPQR The National Weather Service in Portland has issued a * Severe Thunderstorm Warning for... Southeastern Clackamas County in northwestern Oregon... Eastern Marion County in northwestern Oregon... * Until 630 PM PDT. * At 525 PM PDT, a severe thunderstorm was located 12 miles south of Timothy Lake, or 21 miles northeast of Detroit, moving northwest at 25 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Timothy Lake and Three Lynx.
INSTRUCTION: For your protection move to an interior room on the lowest floor of a building. Prepare immediately for large hail and deadly cloud to ground lightning. Seek shelter inside a well-built structure. Stay away from windows. Gusty winds to 40 mph may also occur with this storm.
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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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