Weather Alert in California
Red Flag Warning issued June 20 at 2:14PM PDT until June 22 at 5:00AM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western Antelope Valley Foothills; Antelope Valley
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM 1 PM SATURDAY TO 5 AM PDT SUNDAY FOR STRONG TO DAMAGING NORTHWEST TO NORTH WINDS AND LOW RELATIVE HUMIDITY FOR THE I-5 CORRIDOR, SANTA BARBARA COUNTY INTERIOR MOUNTAINS, VENTURA COUNTY MOUNTAINS, AND ANTELOPE VALLEY INCLUDING WESTERN FOOTHILLS... .An unseasonably strong upper level trough of low pressure will move through the region through Saturday night. West to northwest winds will continue to increase this afternoon and evening brining widespread elevated to brief critical fire weather conditions across the interior and southern Santa Barbara County. The winds are expected to further increase in coverage and speed Saturday afternoon into evening, when damaging winds will likely become more widespread across the interior. The upper trough will bring a cooling trend to the region on Saturday, but humidity levels are still expected to remain low. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for strong to damaging wind and low relative humidity, which is in effect from 1 PM Saturday to 5 AM PDT Sunday. * WINDS...Northwest to north 25 to 40 mph with damaging gusts of 50 to 65 mph. * RELATIVE HUMIDITY...Areas of humidity 10 to 25 percent, gradually rising late Saturday night. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior, rapid fire growth, and long range spotting, which could threaten life and property.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. Use extreme caution with anything that can spark a wildfire. Residents near interfaces should be prepared to evacuate if a wildfire breaks out. See readyforwildfire.org and wildfirerisk.org for information.
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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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