Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 424 AM EDT Wed Sep 23 2020 Valid 12Z Wed Sep 23 2020 - 12Z Fri Sep 25 2020 ...Post-tropical cyclone Beta is forecast to spread heavy rain across the lower Mississippi Valley toward the southern Appalachians for the next couple of days... ...A large low pressure system will bring moderate to heavy rain into the Pacific Northwest for the next few days... ...Warm weather over the northern/central Plains but cool across the South and the Pacific Northwest... As cool and stable air associated with a large high pressure system continues to feed into the Deep South, Tropical Depression Beta has been declared extratropical as the center continues to track slowly east-northeast just inland from the upper Texas coast. The upper-level winds have been carrying and organizing the moisture from Beta farther inland. Areas of moderate to heavy rain are now extending from eastern Texas to the lower Mississippi Valley. A swath of heavy rain associated with post-tropical cyclone Beta will continue to spread across the interior Deep South toward the southern Appalachians during the next couple of days where a few inches of total rainfall can be expected. Meanwhile, the large and powerful Hurricane Teddy has become extratropical as it approaches Nova Scotia early this morning. Strong gusty winds and dangerous surf associated with Teddy over New England will gradually subside later today as the storm moves rapidly away across the Canadian Maritimes. A large low pressure system in the northeastern Pacific is forecast to bring an extended period of moderate to heavy rain into the Pacific Northwest. The first batch of rain is moving onshore early this morning. The rain will spread further inland across the Intermountain region on Thursday with wet snow possible for the high elevations Friday morning. Cool afternoon temperatures are expected across the region due to clouds and precipitation. The associated upper-level trough will help develop a new low pressure system over the Canadian Rockies on Thursday. Temperatures will warm up over the Front Range and the High Plains ahead of an associated warm front. Some places may see record high temperatures on Thursday and Friday afternoons when temperatures are forecast to reach the lower 90s at the warmest locations. The upper Midwest should see an increasing chance of thunderstorms Wednesday night into Thursday near a frontal boundary. Meanwhile, the fire risk will be elevated on Thursday across the northern Rockies to the Great Basin as strong surface wind gusts and dry conditions sweep across ahead of a cold front. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php