Strong to severe thunderstorms and heavy rain will impact portions of the central Plains into the Upper Midwest and the Mid-Atlantic through the weekend. A stretch of unusually hot and humid weather is expected across portions of the central U.S. and the Southeast beginning this weekend and continuing through next week. The heat may reach dangerous levels, particularly mid to late next week. Read More >
Seattle/Tacoma, WA
Weather Forecast Office
The Weather Risk Outlook colors are determined after NWS Seattle meteorologists examine both the impact level of potential weather scenarios AND the associated probability of those scenarios. The resulting outlook displays the highest risk for each day.
NWS Seattle meteorologists first use the impact table to determine the level of impact expected with a forecast weather event.
NWS Seattle meteorologists then determine the color by determining the probability of occurrence using all the available information and then reference the matrix to determine the risk level associated with the forecast weather event.
NWS Seattle Warning, Watch, Advisory Criteria (not all links in this download will work)
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Seattle/Tacoma, WA
7600 Sand Point Way NE
Seattle, WA 98115-6349
(206) 526-6087
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