Weather Alert in California
Red Flag Warning issued August 22 at 4:12PM PDT until August 23 at 9:00PM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Santa Clarita Valley; Santa Susana Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills
DESCRIPTION: ...RED FLAG WARNING IN EFFECT UNTIL 9 PM PDT SATURDAY FOR AN UNSEASONABLY HOT AND UNSTABLE AIR MASS CAPABLE OF PRODUCING EXTREME FIRE BEHAVIOR FROM VERTICAL PLUME GROWTH... LOW RELATIVE HUMIDITY...LOCALLY GUSTY WINDS, ISOLATED DRY LIGHTNING STRIKES, AND CRITICALLY DRY FUELS FOR PORTIONS OF THE MOUNTAINS AND FOOTHILLS OF LOS ANGELES, VENTURA, SANTA BARBARA, AND SAN LUIS OBISPO COUNTIES... .A significant heatwave and increased instability, along with isolated dry lightning strikes and gusty outflow winds will continue, bringing dangerous fire-weather conditions. * TEMPERATURES...Unseasonably hot high temperatures, generally 95-110 degrees today (cooling a few degrees on Saturday), producing unstable conditions, with deep mixing heights of 12,000 to 18,000 feet. * RELATIVE HUMIDITY...Minimum relative humidity 8-20 percent, except 20-40 percent across higher mountains. * THUNDERSTORMS...Isolated thunderstorms will be possible through the weekend, and any accompanying lightning strikes will be capable of starting new fires on the peripheries of rain cores. In addition, the environment will be favorable for strong downburst/outflow winds gusting 40 to 50 mph, capable of causing rapid fire spread. In addition, distant thunderstorms will be capable of bringing sudden wind shifts and increased fire-spread rates. * WINDS...Outside of thunderstorms, southwest at 10-20 mph gusting to 20-25 mph over the western Antelope Valley Foothills and vicinity and in other wind- favored areas such as through passes and canyons. Lighter winds elsewhere. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior and rapid fire growth, which could threaten life and property. Be aware of sudden re-direction of fires in response to passing outflow boundaries. * ADDITIONAL DETAILS...Red Flag Warning headlines may eventually need to be extended into Sunday.
INSTRUCTION: A Red Flag Warning means that fire-weather conditions are expected to be favorable for the development of extreme fire behavior. Use extreme caution with anything that can spark a wildfire. Residents near wildland 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 is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
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
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