NWS Seattle Briefings & Information

Winter Hazards Across the North; Heavy Rainfall Across the Gulf Coast; Severe Weather Outlook

Moisture across the northern Plains, upper Great Lakes into northern New England will likely bring a period of snow, sleet and freezing rain through this weekend. Meanwhile, heavy rainfall continues along the Gulf Coast with areas of flooding. Fire weather conditions continue for the areas of the Plains, southern Appalachians into portions of Florida. Severe thunderstorm potential increasing. Read More >

Weather Risk Outlook

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.