Weather Alerts for California
1. High Surf Advisory for: Ventura County Beaches
2. Wind Advisory for: Cuyama Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
3. Wind Advisory for: Owens Valley; Esmeralda and Central Nye County
4. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
5. Wind Advisory for: West Side Mountains north of 198; West Side Mountains South of 198; Buena Vista; Tehachapi; Grapevine; Frazier Mountain Communities; Mojave Desert Slopes
6. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge
7. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County
8. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
9. Winter Weather Advisory for: Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra
10. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
11. Winter Weather Advisory for: Mono
12. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
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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 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
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