A strong weather system is expected to bring periods of moderate to heavy rain to southwest Oregon and northern California through Wednesday evening, according to the National Weather Service in Medford.

The heaviest rain is expected Tuesday afternoon through Wednesday afternoon.

The combination of heavy rain and snow melt may cause flooding of small streams, creeks, and urban areas. Rapid rises are expected on some of the main stem rivers, including the Chetco, Scott and Klamath rivers, but flooding is not expected in these areas at this time.

Strong winds are expected in the Shasta Valley and in the southern Rogue Valley as well as over higher terrain east of the Cascades.

Be sure to check road conditions before venturing out. You can call 511 for Oregon road conditions and for California road conditions, call 800-427-ROAD (7623).

High surf

This storm system will also create wind-driven waves with a large southwest swell, bringing elevated surf and 22 to 25 foot breakers to the southern Oregon Coast Tuesday evening and all day Wednesday.

Beaches from Cape Blanco southward will be the most likely to see the large breakers. If you must go to the beach, stay off rocks, logs, and jetties. Never turn your back on the ocean.

These waves might cross jetties and other exposed rocks and can move large logs and beach debris.

Bar crossings and the surf zone will be very hazardous due to strong currents and breaking waves.

The high surf advisory will remain in effect until 10 p.m. Wednesday.