Weather Alerts for California

Recent Locations: Hillsboro, MO   Jacksonville, OR   Santa Rosa, CA  

1. Extreme Heat Warning for: Apple and Lucerne Valleys

2. Extreme Heat Warning for: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning

3. Extreme Heat Warning for: Coalinga - Avenal; Fresno-Clovis; West Side Mountains South of 198; Buena Vista; Bakersfield; South End San Joaquin Valley; Fresno-Tulare Foothills; South End Sierra Foothills

4. Extreme Heat Warning for: Indian Wells Valley; Mojave Desert Slopes; Mojave Desert

5. Extreme Heat Warning for: West Side Mountains north of 198; Mariposa Madera Foothills

6. Extreme Heat Warning for: Western Siskiyou County; Central Siskiyou County

7. Flash Flood Warning for: Madera, CA; Mariposa, CA; Tuolumne, CA

8. Flash Flood Warning for: Nevada, CA; Sierra, CA; Washoe, NV

9. Flash Flood Warning for: San Bernardino, CA

10. Flood Advisory for: Placer, CA; Washoe, NV

11. Flood Watch for: Mono; Mineral and Southern Lyon Counties; Greater Reno-Carson City-Minden Area

12. Heat Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties

13. Heat Advisory for: Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling

14. Heat Advisory for: North Bay Interior Mountains; East Bay Interior Valleys; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills

15. Heat Advisory for: North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Modoc County; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

16. Heat Advisory for: Northern Humboldt Interior; Southern Humboldt Interior; Northwestern Mendocino Interior; Southeastern Mendocino Interior

17. Heat Advisory for: Northern Trinity; Southern Trinity; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County

18. Heat Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire

19. Heat Advisory for: San Diego County Inland Valleys

20. Heat Advisory for: Santa Ana Mountains and Foothills; Orange County Inland

21. Heat Advisory 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

22. Heat Advisory for: South Central Siskiyou County

23. Heat Advisory for: 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

24. Heat Advisory for: West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Southeast San Joaquin Valley; Kern River Valley

25. Red Flag Warning for: Cuyama Valley; Santa Clarita Valley; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Santa Susana 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

26. Red Flag Warning for: Fort Tejon

27. Red Flag Warning for: Western Klamath National Forest; Central Siskiyou County Including Shasta Valley; Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley; Siskiyou Mountains; Southern Oregon Cascades; Klamath Basin and the Fremont-Winema National Forest; South Central Oregon Desert including the BLM Land in Eastern Lake and Western Harney Counties

28. Severe Thunderstorm Warning for: Nevada, CA; Placer, CA; Washoe, NV

29. Severe Thunderstorm Warning for: Sierra, CA; Washoe, NV

30. Special Weather Statement for: Coalinga - Avenal; West Side of Fresno and Kings Counties

31. Special Weather Statement for: Yosemite NP outside of the valley; Upper San Joaquin River

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Weather Topic: What are Fractus Clouds?

Home - Education - Cloud Types - Fractus Clouds

Fractus Clouds Next Topic: Freezing Rain

A fractus cloud (scud) is a fragmented, tattered cloud which has likely been sheared off of another cloud. They are accessory clouds, meaning they develop from parent clouds, and are named in a way which describes the original cloud which contained them.

Fractus clouds which have originated from cumulus clouds are referred to as cumulus fractus, while fractus clouds which have originated from stratus clouds are referred to as stratus fractus. Under certain conditions a fractus cloud might merge with another cloud, or develop into a cumulus cloud, but usually a fractus cloud seen by itself will dissipate rapidly.

They are often observed on the leading and trailing edges of storm clouds, and are a display of wind activity.

Next Topic: Freezing Rain

Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

Graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail

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