Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Sun Jun 28 2020 Valid 12Z Sun Jun 28 2020 - 12Z Tue Jun 30 2020 ...Scattered thunderstorms could be severe and cause flash flooding in central and eastern parts of the country... ...Locally heavy precipitation likely over the Northwest along with colder temperatures, while fire danger is expected for the Central Great Basin and Southwest... ...Saharan dust continues to affect Florida in particular today... A frontal system is forecast to move southeastward through the Northeast and Mid-Atlantic for the beginning of the week, but stall farther west over the Ohio Valley and Midwest, creating favorable conditions for thunderstorms. The Upper Mississippi Valley and portions of the Lower Ohio Valley to Southern Appalachians will both be focuses for severe weather and flash flooding today, and Slight Risks of both hazards are delineated there. There is also a Slight Risk of severe weather in place for portions of the Northeast ahead of the front. On Monday, locally heavy rainfall could lead to flash flooding over the Middle Mississippi Valley and the Upper Midwest. A cold upper-level low is forecast to move southeast through the Pacific Northwest and Great Basin through the beginning of the week. Temperatures are expected to be unseasonably cool, with high temperatures 15 to even 30 degrees below average in the Northern Great Basin and Northern Rockies today, shifting southward into the Central Great Basin and Southwest on Monday. Additionally, widespread precipitation is likely in the Northwest, with elevation-enhanced rain totals of 1 to 3 inches likely in the Northern Rockies. Some wet snow is even possible for higher elevations of the Cascades and northern Rockies as temperatures drop to near freezing. Meanwhile, widespread Red Flag Warnings and Critical Risks of fire weather are in effect for parts of California, the Central Great Basin, and the Southwest due to gusty winds and low humidity. A Slight Risk of severe weather is also in place for the Northern High Plains today ahead of the upper low. Surface high pressure is expected over Florida, influenced by the western edge of the Bermuda High. This flow pattern will lead to continued inflow of Saharan dust into mainly Florida today. The main impacts of the Saharan dust will be hazy skies during the day, locally reduced visibility, and degraded air quality. However, this could also make for some very colorful sunrises and sunsets with deeper oranges and reds compared to normal. The concentration of dust should ease Monday before another round may enter the Gulf later in the week. Additionally, temperatures over Florida should be hotter than normal, and could even set records with highs in the upper 90s. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php