Weather Alert in California

Recent Locations: Appleton, MN   Bonham, TX   Arroyo Grande, CA  
Current Alerts for Arroyo Grande, CA: Extreme Heat Warning

Fire Weather Watch issued August 24 at 12:05AM PDT until August 25 at 11:00PM PDT by NWS Eureka CA

AREAS AFFECTED: Trinity

DESCRIPTION: ...SCATTERED DRY THUNDERSTORMS EACH AFTERNOON EARLY THIS WEEK... .Scattered dry thunderstorms expected over high terrain each afternoon early this week. Some isolated storms possible as early as Sunday afternoon with increasing storm coverage through Tuesday as far south as northern Lake County. Fuels are very dry on the heels of high heat. The National Weather Service in Eureka has issued a Fire Weather Watch, which is in effect from Monday afternoon through Monday evening. * AFFECTED AREA...Fire weather zone 283, Northern Trinity County. * THUNDERSTORMS...Mostly dry storms over high terrain in the late afternoon and evening. * OUTFLOW WINDS...Gusty and erratic outflow winds over 40 mph. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.

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Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds

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