FLOOD WARNING ISSUED FOR STILLAGUAMISH RIVER March 09, 2014
Flooding in Sultan, WA 2012. Sky Valley Chronicle photo. CLICK TO ENLARGE
(SEATTLE, WA) -- The National Weather Service in Seattle has issued a flood warning for the Stillaguamish river at Arlington until late Sunday night. At 5:54 am Sunday the stage was 13.2 feet and flood stage is 14.0 feet. Minor flooding is forecast.
Forecast: the river will rise above flood stage around 9 am Sunday and crest near 14.6 feet around 11 am Sunday. The river is forecast to fall below flood stage early this afternoon.
At 14.0 feet the Stillaguamish River will locally spill over its banks. Minor flooding around Silvana will occur including over Pioneer Highway.
A stage of 14 feet on the Stillaguamish River corresponds roughly to phase 2 in the Snohomish County flood program.
The recent heavy rainfall has resulted in an increased threat of landslides in western Washington. Several inches of rain over the past several days has increased soil moisture to high levels across western Washington.
Rainfall amounts in the last 18 hours have been over 3 inches in the mountains and as much as 2 inches in the Lowlands. The weather service says this heavy rainfall will add to the problem of already saturated soils by putting extra pressure on soil instability and leading to an increased risk of landslides.
Cumulative rainfall over the last week has soaked soils to the point where the Washington landslide risk level is at elevated levels.
Several landslides have already been reported in various locations across western Washington including near Mukilteo and Auburn as well as on Highway 101 near the Hood Canal and the weather service says more landslides are possible over the next couple of days.
With an elevated landslide risk rainfall induced landslides are possible during bursts of intense rainfall or when there is heavy rainfall over a period of a day or two.
The weather service says a gradually diminishing risk of landslides will continue for several days after the rain ends. Areas most susceptible to landslides under these conditions are steep coastal bluffs and other steep hillsides.
For more information about current conditions visit www.Weather.Gov/Seattle select hydrology and then scroll down for the links to the landslide information pages.
To report landslides to the state for tabulation go to the Washington state landslide risk web Page and the link for reporting.