Weather Alert in Oregon
Extreme Heat Watch issued August 20 at 2:50AM PDT until August 25 at 5:00AM PDT by NWS Portland OR
AREAS AFFECTED: Lower Columbia River; Tualatin Valley; West Hills and Chehalem Mountains; Inner Portland Metro; Outer Southeast Portland Metro; West Central Willamette Valley; East Central Willamette Valley; Benton County Lowlands; Linn County Lowlands; Lane County Lowlands; West Columbia River Gorge of Oregon above 500 ft; Clackamas County Cascade Foothills; Cowlitz County Lowlands; North Clark County Lowlands; Inner Vancouver Metro; East Clark County Lowlands
DESCRIPTION: * WHAT...Dangerously hot conditions with temperatures of 95 to 100 degrees F possible. Overnight temperatures will range from 60 to 68 degrees F on Friday night and up to 70 degrees on Saturday night, warmest for locations north of Salem. * WHERE...Central and Southern Willamette Valley, Greater Vancouver Metro, Lower Columbia River and Cowlitz River Valleys, Portland Metro Hills, Tualatin Valley, Inner Portland Metro, West Columbia River Gorge of Oregon above 500 ft, and Clackamas County Cascade Foothills. * WHEN...From Friday morning through late Sunday night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially for those spending time outdoors or without access to adequate cooling.
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.
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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