Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 352 AM EDT Mon Aug 08 2022 Valid 12Z Mon Aug 08 2022 - 12Z Wed Aug 10 2022 ...There is a Slight Risk of excessive rainfall over parts of the Southwest, Midwest, eastern Tennessee/Ohio Valley and Northern New England through midweek... ...Dangerous heat across parts of the Pacific Northwest, Middle Mississippi Valley, Central Plains, and Northeast Coast... ...Critical fire weather danger across portions of northern California and the Pacific Northwest due to hot and dry conditions... Over the next couple of days a quasi-stationary front will extend from the Northeast, through the Great Lakes, into the Central and Southern Plains. Moisture pooling along this front will aid in producing showers and thunderstorms over parts of the Great Lakes/Upper Mississippi Valley to the Central High Plains that will move eastward with the front through Wednesday. Given the slow progression, and it tracking over a broad area that has been very wet or have experienced recent flooding, WPC has a large Marginal Risk from the Central Plains to New England through Thursday morning. The most sensitive region will be the eastern part of the Ohio/Tennessee Valley and WPC has Slight Risks in place for Tuesday and Wednesday. Across the Southwest/High Plains, monsoonal moisture will trigger diurnal showers and thunderstorms with heavy rain; therefore, WPC has issued a Slight Risk of excessive rainfall over parts of the Great Basin and the Southwest. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable. A handful of heat advisories remain in effect across the Lower Mississippi Valley, St. Louis metro, parts of the Northeast and for the Pacific Northwest. Temperatures in these areas are forecast to reach the upper 90s to low 100s along with high humidity; which will make the air feeler more oppressive. Cooler air filtering in behind the slow-moving front will help reduce the excessive heat. Southern portions of Oregon and northern California will have an elevated threat for fire weather through at least Tuesday given lower humidity, gusty winds and increased chances for lightning. Red Flag warnings are in effect. Campbell Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php