Weather Alerts for California

Recent Locations: Accomac, VA Stafford Springs, CT Ben Lomond, CA

1. Air Quality Alert for: Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley

2. Cold Weather Advisory for: East Bay Hills

3. Cold Weather Advisory for: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra; Yosemite NP outside of the valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra

4. Cold Weather Advisory for: North Bay Interior Mountains; North Bay Interior Valleys; East Bay Interior Valleys; Santa Clara Valley Including San Jose; Northern Salinas Valley/Hollister Valley and Carmel Valley

5. Cold Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

6. Cold Weather Advisory for: Yosemite Valley

7. Extreme Cold Warning for: Eastern Santa Clara 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

8. Freeze Warning for: 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; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley

9. High Wind Warning for: Coastal Del Norte

10. High Wind Warning for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior

11. Hydrologic Outlook for: Siskiyou, CA; Coos, OR; Curry, OR; Josephine, OR

12. Wind Advisory for: Central Siskiyou County

13. Wind Advisory for: Mendocino Coast; Northwestern Mendocino Interior; Southwestern Mendocino Interior

14. Wind Advisory for: Northern Humboldt Coast

15. Winter Storm Warning for: Northern Trinity

16. Winter Storm Warning for: Western Siskiyou County; South Central Siskiyou County; North Central and Southeast Siskiyou County

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

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 are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails