High Wind Warning

* WHAT...For the Wind Advisory, south winds 20 to 35 mph with gusts up to 55 mph expected. For the High Wind Warning, south winds 25 to 40 mph with gusts up to 70 mph expected.

* WHERE...Most of the Shasta Valley in central Siskiyou County. This includes portions of Interstate 5 as well as the communities of Weed, Gazelle, Grenada and Montague.

* WHEN...For the Wind Advisory, until 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 1 PM PST Friday.

* IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Highways running west to east will be exposed to tough driving conditions given the strong southerly wind speeds.