Weather Alerts for California
1. Freeze Warning for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County
2. Freeze Watch for: Lassen-Eastern Plumas-Eastern Sierra Counties
3. Freeze Watch for: Surprise Valley California; Northern Washoe County
4. Freeze Watch for: Western Siskiyou County; Eastern Curry County and Josephine County
5. Frost Advisory for: Coastal Del Norte; Northern Humboldt Coast; Southwestern Humboldt; Mendocino Coast
6. Frost Advisory for: Southwestern Mendocino Interior
7. Frost Advisory for: Western Siskiyou County; Eastern Curry County and Josephine County
8. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
9. Wind Advisory for: Apple and Lucerne Valleys
10. Wind Advisory for: Indian Wells Valley; Mojave Desert
11. Wind Advisory for: Interstate 5 Corridor; Western Antelope Valley Foothills
12. Wind Advisory for: Modoc County; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
13. Wind Advisory for: Mojave Desert Slopes
14. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta
15. Wind Advisory for: Surprise Valley California; Northern Washoe County
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North America Water Vapor (Moisture)
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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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