Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Freeze Watch for: Western Siskiyou County; Central Siskiyou County
3. High Wind Warning for: Eastern Sierra Slopes of Inyo County; Owens Valley; White Mountains of Inyo County; Death Valley National Park; Esmeralda and Central Nye County
4. Wind Advisory for: Chuckwalla Mountains; Imperial County Southeast
5. Wind Advisory for: Imperial County Southwest
6. Wind Advisory for: Joshua Tree NP West
7. Wind Advisory for: Morongo Basin
8. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
9. Wind Advisory for: Salton Sea; Imperial County West; Imperial Valley
10. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
11. Wind Advisory for: San Gorgonio Pass Near Banning
12. Wind Advisory for: Surprise Valley California; Northern Washoe County
13. Winter Storm Warning for: Greater Lake Tahoe Area; Mono; Greater Lake Tahoe Area
14. Winter Storm Warning for: Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP
15. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
16. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River
17. Winter Weather Advisory for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northeastern Mendocino Interior
18. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
19. Winter Weather Advisory for: Western Siskiyou County
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National Weather Forecast for Tomorrow
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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 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