Weather Alerts for California
1. Air Quality Alert for: Imperial Valley
2. Coastal Flood Advisory for: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline
3. Excessive Heat Warning for: Apple and Lucerne Valleys
4. Excessive Heat Warning for: Coachella Valley; San Diego County Deserts
5. Excessive Heat Warning for: Cuyama Valley; Southern Salinas 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; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
6. Excessive Heat Warning for: Indian Wells Valley; Mojave Desert
7. Excessive Heat Warning for: Joshua Tree NP West; Joshua Tree NP East; Chiriaco Summit
8. Excessive Heat Warning for: Marin Coastal Range; Sonoma Coastal Range; North Bay Interior Mountains; North Bay Interior Valleys; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
9. Excessive Heat Warning for: Northern Humboldt Interior
10. Excessive Heat Warning for: Northern Trinity; Southern Trinity
11. Excessive Heat Warning for: Northwestern Mendocino Interior; Northeastern Mendocino Interior
12. Excessive Heat Warning for: Owens Valley; Death Valley National Park; Western Mojave Desert; Western Clark and Southern Nye County; Las Vegas Valley
13. Excessive Heat Warning for: Salton Sea; Chuckwalla Mountains; Imperial County Southeast
14. Excessive Heat Warning for: San Bernardino and Riverside County Valleys-The Inland Empire
15. Excessive Heat Warning for: San Bernardino County Mountains; Riverside County Mountains; San Diego County Mountains
16. Excessive Heat Warning for: San Diego County Inland Valleys
17. Excessive Heat Warning for: San Gorgonio Pass Near Banning
18. Excessive Heat Warning for: Santa Clarita Valley; Santa Lucia Mountains; Santa Ynez Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Eastern San Gabriel Mountains
19. Excessive Heat Warning for: Shasta Lake Area / Northern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Northern San Joaquin Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode
20. Excessive Heat Warning for: Southeastern Mendocino Interior; Northern Lake County; Southern Lake County
21. Excessive Heat Warning for: West Side Mountains north of 198; Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; West Side Mountains South of 198; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Buena Vista; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; South End of the Lower Sierra; Yosemite Valley; Kern River Valley; Tehachapi; Frazier Mountain Communities; Mojave Desert Slopes
22. Excessive Heat Watch for: Northeast Siskiyou and Northwest Modoc Counties; Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
23. Excessive Heat Watch for: Western Siskiyou County; Central Siskiyou County; South Central Siskiyou County; Central Douglas County; Eastern Curry County and Josephine County; Jackson County
24. Heat Advisory for: Del Norte Interior
25. Heat Advisory for: Los Angeles County San Gabriel Valley
26. Heat Advisory for: Northern Trinity; Southern Trinity
27. Heat Advisory for: Northwestern Mendocino Interior; Northeastern Mendocino Interior
28. Heat Advisory for: Orange County Inland
29. Heat Advisory for: San Francisco
30. Heat Advisory for: San Francisco Bay Shoreline; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay
31. Heat Advisory for: San Luis Obispo County Inland Central Coast; Santa Barbara County Inland Central Coast; Ventura County Inland Coast; Los Angeles County Inland Coast including Downtown Los Angeles
32. Heat Advisory for: Santa Ana Mountains and Foothills
33. Heat Advisory for: Southwestern Humboldt; Southern Humboldt Interior
34. Heat Advisory for: Southwestern Mendocino Interior
35. Red Flag Warning for: Lake County Portion of Lake-Napa-Sonoma Unit
36. Red Flag Warning for: Marin Coastal Range; Sonoma Coastal Range; Santa Cruz Mountains; East Bay Hills
37. Red Flag Warning for: North Bay Interior Mountains
38. Red Flag Warning for: Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft; Central Sacramento Valley including Glenn/Colusa/Yuba/Northern Sutter/Butte County Below 1000 Ft; Southern Sacramento Valley In Yolo/Sacramento/Far Western Placer/Southern Sutter and Solano County Below 1000 Ft - Excludes the Delta; Eastern Delta; Southeast Edge Shasta/Trinity NF and Western Portions of Tehama/Glenn RU; Northern Sierra Foothills from 1000 to 3000 Ft. Includes Nevada-Yuba-Placer RU and Anador-Eldorado RU; Eastern Mendocino NF
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Current U.S. National Radar--Current
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North America Water Vapor (Moisture)
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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
