Weather Alerts for California
1. Air Quality Alert for: Coachella Valley
2. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley
3. Beach Hazards Statement for: Southern Monterey Bay and Big Sur Coast
4. Frost Advisory for: Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County
5. High Surf Advisory for: Los Angeles County Beaches
6. High Surf Advisory for: San Diego County Coastal Areas
7. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
8. High Surf Advisory for: Ventura County Beaches
9. Wind Advisory for: Imperial County Southwest
10. Wind Advisory for: Imperial County West; Imperial Valley
11. Wind Advisory for: Indian Wells Valley; Mojave Desert
12. Wind Advisory for: Mojave Desert Slopes
13. Wind Advisory for: North Bay Interior Mountains; East Bay Hills
14. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta
15. Wind Advisory for: San Diego County Deserts; San Gorgonio Pass Near Banning
16. Wind Advisory for: San Francisco; Marin Coastal Range; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Salinas Valley/Hollister Valley and Carmel Valley; Southern Monterey Bay and Big Sur Coast
17. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
18. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County
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North America Water Vapor (Moisture)
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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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