Weather Alerts for California
1. Air Quality Alert for: Coachella Valley
2. Wind Advisory for: Apple and Lucerne Valleys; San Diego County Deserts; San Gorgonio Pass Near Banning
3. Wind Advisory for: Death Valley National Park; Western Mojave Desert
4. Wind Advisory for: Imperial County Southwest
5. Wind Advisory for: Imperial County West
6. Wind Advisory for: Indian Wells Valley; Mojave Desert Slopes; Mojave Desert
7. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
8. Winter Weather Advisory for: Mono
9. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
10. Winter Weather Advisory for: Yosemite NP outside of the valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP
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Current U.S. National Radar--Current
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North America Water Vapor (Moisture)
This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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
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