People in Seattle and the surrounding region should prepare for urban flooding caused by heavy rain. According to The National Weather Service, "Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Storm drains, and ditches may become clogged with debris."
Here's a radar map of the Pacific Northwest to give you an idea of the size of the massive weather system causing heavy rain in Seattle:
Today's forecast is for another 2-4 inches of rain, with rainfall rates as high as 0.5-0.75 inches per hour in some regions of Washington State. The chance of severe rain will reduce later tonight when the weather system goes further inland to feed a low-pressure system over Alberta, Canada. That low-pressure system is predicted to grow over the northern Plains/upper Midwest on Saturday night/early Sunday, bringing further snow and gusty winds to that region of the country.
Throughout the weekend, Seattle should experience much milder weather. On Saturday, it will be mostly cloudy, with showers throughout the afternoon. The temperature will hover around 51F but will have a humidity of 86%. Moving into Sunday, rain is expected throughout the day, with approximately half an inch forecast for the Seattle metro area.
Another band of extremely heavy rain is headed directly for the Pacific Northwest from Hawaii, according to the National Weather Service. Urban flooding may happen in some areas of Seattle and Washington State over the next few days due to excessive rainfall. So, if you're walking or driving outside, be cautious of fallen trees and other debris.
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