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; Napa, CA; Sonoma, CA
8. Flood Warning for: Siskiyou, CA
9. Flood Warning for: Siskiyou, CA; Coos, OR; Curry, OR; Jackson, OR; Josephine, OR
10. Flood Watch for: Coastal Del Norte; Del Norte Interior
11. 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
12. Flood Watch for: Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southwestern Mendocino Interior; Southeastern Mendocino Interior
13. Flood Watch for: Northern Humboldt Coast
14. Flood Watch for: Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
15. Flood Watch for: Northern Lake County; Southern Lake County
16. 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
17. Flood Watch for: Southeastern Mendocino Interior
18. Flood Watch for: Southern Trinity
19. Frost Advisory for: Ojai Valley; Calabasas and Agoura Hills
20. 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
21. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
22. High Wind Warning for: Central Siskiyou County
23. High Wind Warning for: Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
24. High Wind Warning for: Northeast Siskiyou and Northwest Modoc Counties
25. High Wind Watch for: Coastal Del Norte; Del Norte Interior; Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
26. Wind Advisory for: Mendocino Coast
27. Wind Advisory for: Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
28. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Northeast Foothills/Sacramento Valley
29. 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
30. Winter Storm Warning for: Burney Basin / Eastern Shasta County
31. Winter Storm Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties; Greater Lake Tahoe Area; Greater Lake Tahoe Area
32. Winter Storm Warning for: Mono
33. Winter Storm Warning for: Northern Trinity
34. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
35. Winter Storm Watch for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
36. Winter Storm Watch for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra
37. 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
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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 Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
