Soggy conditions could cause street flooding

November 20, 2012

By Warren Kagarise

Expect a soggy Thanksgiving and a side of rain on the day before the holiday, as a series of systems batters Western Washington.

The weather comes as rain-soaked Pacific systems barrel across the region in quick succession. National Weather Service meteorologists in Seattle said strong fronts should affect Western Washington, and increase the risk of flooding on streets.

Forecasters said residents should expect 2 to 5 inches of additional rain to fall in the mountains below the snow level. The influx of moisture increases the landslide risk on slopes.

What to know
Call the Issaquah Public Works Operations Department at 837-3470 to address larger storm water issues. Issaquah Creek flood gauge data is available at King County’s flooding website,

Then, wet and windy weather should continue through the week, with a lull possible on Thanksgiving. Snow is forecast to fall in the mountains, and motorists should prepare for snow in the mountain passes, including Snoqualmie Pass.

Forecasters said another waterlogged weather system could arrive by the weekend.

The precipitation raises the prospect of localized flooding on city streets and small streams.

Issaquah residents can reduce street-flooding risk by clearing debris, such as fallen leaves and tree branches, from storm drains near homes.

The wet weather is not expected to cause flooding along Issaquah Creek, although conditions can change quickly.

City officials base Issaquah Creek flood warnings on real-time data from a gauge upstream from Issaquah in Hobart. The system usually provides hours of lead time before flooding impacts Issaquah. Officials also monitor a gauge at the creek mouth in Lake Sammamish State Park.

Issaquah dodged significant flooding last year, and the last flooding to occur in the city resulted after a Pineapple Express storm barreled into the region in early December 2010.

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