Weather Alerts for California

Recent Locations: Granite Bay, CA  

1. Air Quality Alert for: Fresno; Kern; Kings; Madera; Mariposa; Merced; San Joaquin; Stanislaus; Tulare; Tuolumne

2. Air Quality Alert for: Northern Lake County; Southern Lake County

3. Fire Weather Watch for: North Bay Mountains

4. Fire Weather Watch for: Santa Lucia Mountains and Los Padres National Forest

5. Heat Advisory for: Cuyama Valley; San Luis Obispo County Mountains

6. Heat Advisory for: East Bay Interior Valleys; North Bay Interior Valleys; Northern Salinas Valley, Hollister Valley and Carmel Valley; San Francisco; San Francisco Bay Shoreline; Santa Clara Valley Including San Jose; Santa Cruz Mountains

7. Heat Advisory for: Los Angeles County Coast including Downtown Los Angeles

8. Heat Advisory for: Los Angeles County Mountains excluding the Santa Monica Range; Santa Barbara County Mountains; Ventura County Mountains

9. Heat Advisory for: Los Angeles County San Fernando Valley

10. Heat Advisory for: Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Monica Mountains Recreational Area; Ventura County Coastal Valleys; Ventura County Interior Valleys

11. Heat Advisory for: Orange County Coastal; Orange County Inland; San Diego County Coastal Areas

12. Heat Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys

13. Heat Advisory for: San Luis Obispo County Central Coast; Santa Barbara County Central Coast; Santa Ynez Valley

14. Heat Advisory for: San Luis Obispo County Interior Valleys

15. Heat Advisory for: Santa Barbara County South Coast

16. Heat Advisory for: Southern Salinas Valley, Arroyo Seco and Lake San Antonio

17. Heat Advisory for: Southern Salinas Valley, Arroyo Seco and Lake San Antonio

18. Heat Advisory for: Ventura County Coast

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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).

Current U.S. National Radar

National Weather Forecast--Current

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

Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

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

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Stratocumulus Clouds Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds