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 are Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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