Weather Alert in Oregon
Red Flag Warning issued July 3 at 1:18PM MDT until July 3 at 9:00PM MDT by NWS Boise ID
AREAS AFFECTED: Burns BLM; Southern Grasslands
DESCRIPTION: ...RED FLAG WARNING FOR SCATTERED LIGHTNING THIS EVENING...AND AGAIN EARLY FRIDAY MORNING THROUGH LATE FRIDAY EVENING IN SOUTHEAST OREGON... .Scattered thunderstorms will develop this afternoon and evening across southeast Oregon and far southwest Idaho. Several more rounds of thunderstorms are likely in southeast Oregon beginning early Friday morning lasting through late Friday evening. Gusty outflow winds and lightning, combined with warm temperatures and low humidity, will lead to critical fire weather conditions. ...RED FLAG WARNING IN EFFECT FROM 2 AM TO 10 PM PDT FRIDAY FOR LIGHTNING FOR BURNS BLM AND SOUTHERN GRASSLANDS...WHICH ARE FIRE WEATHER ZONES 670 AND 672... The National Weather Service in Boise has issued a Red Flag Warning for lightning, which is in effect from 2 AM to 10 PM PDT Friday. * AFFECTED AREA...In Oregon, Fire Weather Zones 670 Burns BLM and 672 Southern Grasslands. * TIMING...For the first Red Flag Warning, until 8 PM PDT this evening. For the second Red Flag Warning, from 2 AM to 10 PM PDT Friday. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Scattered. * OUTFLOW WINDS...Isolated gusts up to 50 mph.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly.
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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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