Weather Alert in Oregon
Red Flag Warning issued July 29 at 2:26PM MDT until July 30 at 12:00AM MDT by NWS Boise ID
AREAS AFFECTED: Burns BLM; Southern Grasslands
DESCRIPTION: ...RED FLAG WARNING FOR LIGHTNING THROUGH THIS EVENING... ...RED FLAG WARNING FOR LIGHTNING WEDNESDAY AFTERNOON AND EVENING... .Scattered thunderstorms with abundant lightning will develop this afternoon and evening across portions of southeast Oregon. Storms will redevelop Wednesday afternoon and evening. While some storms will produce wetting rainfall, areas outside of thunderstorm cores will be especially susceptible to new starts. Gusty outflow winds up to 60 mph are possible near storms. The National Weather Service in Boise has issued a Red Flag Warning for lightning, which is in effect from 2 PM to 11 PM PDT Wednesday. * AFFECTED AREA...In Oregon, Fire Weather Zones 670 Burns BLM and 672 Southern Grasslands. * TIMING...For the first Red Flag Warning, until 11 PM PDT this evening. For the second Red Flag Warning, from 2 PM to 11 PM PDT Wednesday. * THUNDERSTORMS...Scattered. * OUTFLOW WINDS...Gusty erratic winds up to 60 mph. * 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 occur shortly.
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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