Weather Alert in Oregon
Red Flag Warning issued August 21 at 1:17PM PDT until August 22 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Warm Springs Reservation
DESCRIPTION: ...LOCALLY BREEZY WITH LOW RELATIVE HUMIDITY FRIDAY... .As a heat wave moves over the region, a transitory period will allow for locally breezy conditions along the east slopes of the Oregon Cascades. The Warm Springs Reservation in particular, as well as southeastern Wasco and northeastern Jefferson Counties, are expected to see critical fire weather conditions during the day Friday as RHs drop well into the teens. The National Weather Service in Pendleton has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM to 11 PM PDT Friday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 703 Warm Springs Reservation. * TIMING...From 2 PM to 11 PM PDT Friday. * WINDS...Northeast 10 to 15 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
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Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
Weather Topic: What is Evaporation?
Home - Education - Precipitation - Evaporation
Next Topic: Fog
Evaporation is the process which returns water from the earth
back to the atmosphere, and is another crucial process in the water cycle.
Evaporation is the transformation of liquid into gas, and it happens because
molecules are excited by the application of energy and turn into vapor.
In order for water to evaporate it has to be on the surface of a body of water.
Next Topic: Fog
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