Change In The River Forecast And Warning Point For The South Fork Stillaguamish River

Above Normal Temperatures, Strong Thunderstorms, Tropical Development Being Monitored

Well above normal temperatures are forecast to shift from the northern Plains through the Northeast U.S. over the long holiday weekend. A few strong to severe thunderstorm will be possible as well along with a potential for excessive rainfall. A tropical or subtropical depression could form off the Southeast U.S. coast over the weekend while drifting northward to northeastward. Read More >

This flood season there is a change in the flood services for the National Weather Service Seattle`s Hydrologic Service Area for the South Fork Stillaguamish River in Snohomish County. Effective today, the river forecast point/flood warning point on the South Fork Stillaguamish River has been moved from the stream gauge at Granite Falls to the stream gauge at Jordan Road Bridge. Starting today, river forecasts and flood warnings will now be based on the Jordan Road Bridge stream gauge. These gauges can be seen on our AHPS website at: https://water.weather.gov/ahps2/index.php?wfo=sew South Fork Stillaguamish River at Jordan Road Bridge: Flood warnings for this site are for the river valley including Jordan Road and the Robe Valley, Granite Falls, and Blue Spruce areas. These are the NWS flood levels for this new location: Flood Stage/Minor Flood: 14.5 feet Moderate Flood: 16.0 feet Major Flood: 17.0 Feet The reason for change in the forecast point on the South Fork Stillaguamish River stems from the lack of the ability to make accurate stream measurements at the Granite Falls gauge location, which relates the gauge height reading to the flow of water. If you would like more information about the National Weather Service hydrologic services in the Seattle area, please contact Brent Bower, Senior Service Hydrologist, at 206-526-6095.