Weather Alerts for California
1. High Surf Advisory for: Coastal Del Norte; Northern Humboldt Coast; Southwestern Humboldt; Mendocino Coast
2. High Surf Advisory for: San Diego County Coastal Areas
3. High Surf Advisory for: San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
4. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches; Ventura County Beaches
5. High Wind Warning for: Central Siskiyou County
6. High Wind Warning for: Coastal Del Norte
7. High Wind Warning for: Modoc County; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
8. Wind Advisory for: Coastal Del Norte
9. Wind Advisory for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
10. Wind Advisory for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior
11. Wind Advisory for: Interstate 5 Corridor
12. Wind Advisory for: Northern Humboldt Coast
13. Wind Advisory for: Santa Barbara County Interior Mountains
14. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range
15. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains
16. Wind Advisory for: Surprise Valley California; Greater Reno-Carson City-Minden Area; Northern Washoe County
17. Wind Advisory for: Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
18. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
19. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
20. Winter Weather Advisory for: Mono
21. Winter Weather Advisory for: Northern Trinity
22. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
23. Winter Weather Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River
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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 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
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
