Weather Alert in California
Severe Thunderstorm Warning issued August 25 at 2:37PM PDT until August 25 at 3:15PM PDT by NWS Phoenix AZ
AREAS AFFECTED: Imperial, CA
DESCRIPTION: SVRPSR The National Weather Service in Phoenix has issued a * Severe Thunderstorm Warning for... Southwestern Imperial County in southeastern California... * Until 315 PM PDT. * At 237 PM PDT, a severe thunderstorm was located over El Centro Naval Airfield, or near Imperial, moving northwest at 20 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... El Centro, Imperial, El Centro Naval Airfield, Dixieland, and Seeley. This includes the following highways... CA Interstate 8 between mile markers 24 and 41. CA Route 111 between mile markers 7 and 13. CA Route 86 between mile markers 3 and 17, and between mile markers 29 and 36.
INSTRUCTION: For your protection move to an interior room on the lowest floor of a building.
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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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