Urban flooding and some minor river flooding is possible as a big rainstorm moves into Western Washington Tuesday and is expected to last 24 hours.

Rain will become heavy at times by midday and remain heavy at times through about midday on Wednesday as the warm front stalls over us, said KING 5 Meteorologist Rich Marriott.

Marriot predicts 1 to 3 inches of rain in the lower elevations and 3 to 6 inches on the west slopes of the Cascades and Olympics.

Highs will remain in the 50s to near 60 degreees.

The National Weather Service has posted flood watches for King, Pierce, Snohomish, Mason, Skagit and Whatcom counties in Western Washington, which will go into effect Tuesday afternoon. Flood watches are also posted east of the Cascades for Chelan, Okanogan and Douglas counties.

There could be some general river flooding, but that is expected to be minor. There is also a threat of urban flooding, especially in areas where storm drains are clogged by leaves.

Rainfall of 2 inches or more is expected on the east side of the Cascades and a watch for stream flooding is in effect for portions of Chelan, Douglas and Okanogan counties. Forecasters say the rain could cause mudslides and debris flows in the areas burned by summer wildfires.

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Rains may ease by Wednesday night but forecasters expect a chance of rain for Halloween.

By Thursday the front moves east for decreasing showers and maybe a few sunbreaks.

Friday should become partly sunny, but the rain moves back in again this weekend. Highs will be in the mid to upper 50s through the week.

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