Weather Alert in Oregon
Red Flag Warning issued July 29 at 2:15PM PDT until July 31 at 11:00AM PDT by NWS Pendleton OR
AREAS AFFECTED: Northern Deschutes National Forest
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM 2 PM TO 11 PM PDT TUESDAY FOR ABUNDANT LIGHTNING FOR FIRE WEATHER ZONES OR697, OR698, OR699, OR700, AND OR705... ...RED FLAG WARNING IN EFFECT FROM 1 PM WEDNESDAY TO 11 AM THURSDAY FOR ABUNDANT LIGHTNING FOR FIRE WEATHER ZONES OR700, OR704, AND OR705... ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 9 PM WEDNESDAY FOR ABUNDANT LIGHTNING FOR FIRE WEATHER ZONE WA695... .Multiple rounds of showers and thunderstorms are forecast through Friday. While some of these storms may produce wetting rains, their high-based nature will increase the probability of isolated (today) to scattered (Wednesday) dry thunderstorms. Showers and thunderstorms will be capable of producing gusty and erratic outflow winds up to 60 mph. The National Weather Service in Pendleton has issued a Red Flag Warning for abundant lightning, which is in effect from 1 PM Wednesday to 11 AM PDT Thursday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 704 Northern Deschutes National Forest. * TIMING...From 1 PM Wednesday to 11 AM PDT Thursday. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Abundant lightning with isolated to scattered dry thunderstorms. * OUTFLOW WINDS...Gusty, erratic winds with gusts up to 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 are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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