Weather Alert in Oregon
Heat Advisory issued July 12 at 10:58PM PDT until July 14 at 8:00PM PDT by NWS Medford OR
AREAS AFFECTED: Central Douglas County; Eastern Douglas County Foothills
DESCRIPTION: * WHAT...High temperatures in the mid 90s to around 100 are expected. Low temperatures will be mainly in the lower to mid 60s. * WHERE...Central Douglas County and Eastern Douglas County Foothills, including the Umpqua Basin. This includes Roseburg, Camas Valley, Elkton and Tiller. * WHEN...Until 8 PM PDT Monday. * IMPACTS...An increased chance of heat related illness for those without access to cooling facilities. * ADDITIONAL DETAILS...Hot temperatures are likely to continue into mid-week. Warm overnight temperatures will limit relief from hot daytime temperatures.
INSTRUCTION: Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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