Weather Alert in California

Red Flag Warning issued July 24 at 11:37AM PDT until July 25 at 11:00PM PDT by NWS Eureka CA

AREAS AFFECTED: Van Duzen/Mad River; W Mendocino NF/E Mendocino Unit

DESCRIPTION: ...SCATTERED DRY THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING AND FRIDAY ACROSS THE INTERIOR MOUNTAINS... .Scattered dry thunderstorms are forecast to develop in the Klamath Mountains this afternoon and evening. The highest confidence of storms is in Siskiyou, Northern Humboldt, Eastern Del Norte, and Trinity counties. Scattered Thunderstorms are possible again on Friday, with the highest confidence in Trinity County, Eastern Mendocino, and Northern Lake Counties. The National Weather Service in Eureka has issued a Red Flag Warning, which is in effect from 11 AM to 11 PM PDT Friday. Note that this warning for Friday is only valid for Trinity and Mendocino County portions of these zones. Humboldt County is not within a Red Flag Warning on Friday. * OUTFLOW WINDS...Gusty and erratic outflow winds up to 50 mph are possible. * IMPACTS...Lightning strikes may start fires.

INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.

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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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