Weather Alert in Oregon
Extreme Heat Watch issued July 11 at 1:16PM PDT until July 17 at 12:00AM PDT by NWS Portland OR
AREAS AFFECTED: Lower Columbia River; West Hills and Chehalem Mountains; Outer Southeast Portland Metro; West Columbia River Gorge of Oregon above 500 ft; Cowlitz County Lowlands
DESCRIPTION: * WHAT...Dangerously hot conditions with temperatures between 90 to 100 degrees possible. * WHERE...Lower Columbia River and Cowlitz River Valleys, Portland Metro Hills, and West Columbia River Gorge of Oregon above 500 ft. * WHEN...From Tuesday afternoon through Wednesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...There is a 40-60% chance that Tuesday night low temperatures remain above 65 degrees and a 10-15% chance low temperatures remain above 70 degrees, which would limit overnight relief. There is also a 10-25% chance for high temperatures of 100 degrees or hotter on Tuesday and Wednesday.
INSTRUCTION: Drink plenty of fluids, stay in a cool place during the heat of the day, stay out of the sunshine, and check up on relatives and neighbors. For those without air conditioning, use fans to keep air moving. Keeps windows closed during the day and open at night, unless air quality is degraded due to wildfire smoke. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Monitor the latest forecasts and warnings for updates.
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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
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
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