Weather Alert in California
Red Flag Warning issued June 20 at 9:48PM PDT until June 22 at 5:00AM PDT by NWS Hanford CA
AREAS AFFECTED: West Side Hills; San Joaquin Valley
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FOR THE MOJAVE SLOPES AND DESERT, THE WEST HILLS AND WESTERN PORTIONS OF THE SAN JOAQUIN VALLEY... * AFFECTED AREA...West Side Hills and the San Joaquin Valley. * WIND...Northwestly 15 to 20 mph with gusts to 35 mph. * HUMIDITY...Minimum RH values down to 10 to 20 percent. * HIGHEST THREAT...Across the West Hills and the Western portionsof the San Joaquin Valley. * IMPACTS...any fires that develop will likely spread rapidly. 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 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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