Weather Alerts for California
1. Avalanche Warning for: South Central Siskiyou County
2. Beach Hazards Statement for: Northern Monterey Bay
3. Flood Advisory for: Alameda, CA; Contra Costa, CA; Marin, CA
4. Flood Advisory for: Humboldt, CA
5. Flood Advisory for: Humboldt, CA; Mendocino, CA; Trinity, CA
6. Flood Advisory for: Lassen, CA; Plumas, CA; Sierra, CA
7. Flood Advisory for: Marin, CA; Sonoma, CA
8. Flood Advisory for: Napa, CA; Sonoma, CA
9. Flood Warning for: Siskiyou, CA
10. Flood Warning for: Siskiyou, CA; Coos, OR; Curry, OR; Jackson, OR; Josephine, OR
11. Flood Watch for: Coastal Del Norte; Del Norte Interior
12. Flood Watch for: Marin Coastal Range; Sonoma Coastal Range; North Bay Interior Mountains; Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys
13. Flood Watch for: Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southwestern Mendocino Interior; Southeastern Mendocino Interior
14. Flood Watch for: Northern Humboldt Coast
15. Flood Watch for: Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
16. Flood Watch for: Northern Lake County; Southern Lake County
17. Flood Watch for: Shasta Lake Area / Northern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley
18. Flood Watch for: Southeastern Mendocino Interior
19. Flood Watch for: Southern Trinity
20. Frost Advisory for: Ojai Valley; Calabasas and Agoura Hills
21. High Surf Advisory for: San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Southern Monterey Bay and Big Sur Coast
22. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
23. High Wind Warning for: Central Siskiyou County
24. High Wind Warning for: Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
25. High Wind Warning for: Northeast Siskiyou and Northwest Modoc Counties
26. High Wind Watch for: Coastal Del Norte; Del Norte Interior; Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
27. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
28. Wind Advisory for: Mendocino Coast
29. Wind Advisory for: Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
30. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Northeast Foothills/Sacramento Valley
31. Wind Advisory for: San Francisco; Marin Coastal Range; Sonoma Coastal Range; North Bay Interior Mountains; Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys; San Francisco Bay Shoreline; San Francisco Peninsula Coast
32. Winter Storm Warning for: Burney Basin / Eastern Shasta County; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
33. Winter Storm Warning for: Northern Trinity
34. Winter Weather Advisory for: South Central Siskiyou County; North Central and Southeast Siskiyou County
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Current U.S. National Radar--Current
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National Weather Forecast--Current
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National Weather Forecast for Tomorrow
Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.
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 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
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
