Weather Alert in California
Red Flag Warning issued August 20 at 3:34PM PDT until August 23 at 9:00PM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Cuyama Valley; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains
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...AND LOCALLY BREEZY WINDS FOR PORTIONS OF THE MOUNTAINS AND FOOTHILLS OF LOS ANGELES AND VENTURA COUNTIES... ...RED FLAG WARNING IN EFFECT FROM 9 AM PDT THURSDAY TO 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...AND LOCALLY BREEZY WINDS FOR PORTIONS OF THE MOUNTAINS AND FOOTHILLS OF SANTA BARBARA AND SAN LUIS OBISPO COUNTIES... .A significant heatwave is on the way for late this week into this weekend, bringing dangerous fire-weather conditions. * TEMPERATURES...Unseasonably hot high temperatures, generally 95- 105 degrees, producing unseasonably unstable conditions. * RELATIVE HUMIDITY...Minimum relative humidity 8-20 percent. * THUNDERSTORMS...There is a less than 10 percent chance of isolated thunderstorms Friday through the weekend, and any accompanying lightning strikes will be capable of starting new fires on the peripheries of rain cores. * WINDS...Diurnal wind patterns with speeds of 5-10 mph gusting to 10-15 mph, locally higher in wind-favored areas such as through passes and canyons. * 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...Fire-weather headlines may eventually need to be extended into Sunday.
INSTRUCTION: A Red Flag Warning means that fire-weather conditions could potentially become favorable for the development of extreme fire behavior in the coming days. 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 Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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