Weather Alert in Oregon
Red Flag Warning issued July 28 at 9:46PM PDT until July 29 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Central Blue Mountains; Southern Blue Mountains
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM 2 PM TO 11 PM PDT TUESDAY FOR ABUNDANT LIGHTNING... ...FIRE WEATHER WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR ABUNDANT LIGHTNING... .Elevated fire weather concerns due to thunderstorms and continued hot and dry conditions through midweek. While these storms may produce wetting rains, there is still high confidence in the probability of isolated dry thunderstorms embedded both Tuesday and Wednesday. Daytime RHs will be in the teens to low 20s. Gusty and erratic winds can occur around thunderstorms with gusts up to 45-60 mph. * AFFECTED AREA...Fire Weather Zones 697 Central Blue Mountains and 698 Southern Blue Mountains. * TIMING...From 2 PM to 11 PM PDT Tuesday. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Scattered coverage with abundant lightning as well as 10-40% chances of dry isolated storms embedded. * OUTFLOW WINDS...Gusty erratic winds up to 45-60 mph.
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 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
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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