Weather Alert in California
Red Flag Warning issued July 25 at 6:36AM PDT until July 25 at 11:00PM PDT by NWS Eureka CA
AREAS AFFECTED: Van Duzen/Mad River; W Mendocino NF/E Mendocino Unit; Trinity
DESCRIPTION: ...SCATTERED DRY THUNDERSTORMS POSSIBLE FRIDAY ACROSS THE INTERIOR MOUNTAINS... .Scattered dry thunderstorms are possible again this afternoon and evening, with the highest confidence in Trinity County, Eastern Mendocino, and Northern Lake Counties. * OUTFLOW WINDS...Gusty and erratic outflow winds up to 50 mph are possible. * IMPACTS...Lightning strikes may start fires.
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 Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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