Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 320 AM EST Mon Jan 22 2024 Valid 12Z Mon Jan 22 2024 - 12Z Wed Jan 24 2024 ...More unsettled weather expected to impact the West Coast with heavy rain impacting California today... ...Freezing rain across the central Plains this morning is expected to rapidly spread northeastward into the Midwest today followed by another round of freezing rain tonight from the Midwest to the lower Great Lakes... ...Accumulating snowfall across the lower Great Lakes on Tuesday... ...A couple rounds of heavy rain will raise flooding potential across eastern Texas today, expanding east into the lower Mississippi Valley Tuesday into early Wednesday... As an expansive arctic high pressure system slides eastward across the eastern U.S. today, deep return flow behind the system is directing a channel of moisture from the Gulf of Mexico into the southern Plains. Heavy rain has quickly spread across southern Texas this morning. Farther to the north where the presence of arctic air is being felt, snow, sleet and ice are impacting portions of Oklahoma, Kansas, Arkansas, and Missouri. Strong upper-level flow will direct this channel of moisture quickly northeastward today, bringing periods of freezing rain and sleet up across the Midwest, reaching into the lower Great Lakes tonight. Additional upper-level energy exiting the Rockies and moving into the southern Plains will develop a couple of low pressure systems, bringing a couple quick rounds of rain across the Midwest on Tuesday and again by Wednesday. Colder air farther to the north will support accumulating snowfall from the upper Midwest to the lower Great Lakes and then across portions of New England Tuesday and into early Wednesday as the next round of heavy rain develops across eastern Texas. Along the West Coast, a parade of frontal systems arriving from the Pacific will bring more active weather onshore through the next couple of days. Heavy rain will likely continue across northern California today, followed by a lull on Tuesday before the next surge of heavy rain expected to reach northwestern California early on Wednesday. Meanwhile, heavy wet snow is expected along the Sierra Nevada during similar time frame. Mixed precipitation will also penetrate further inland across the Intermountain region and into the Rockies with frequent passages of upper-level troughs. Unsettled weather will also continue along the coast of the Pacific Northwest with a lull expected Tuesday night. With no additional replenishment of arctic air from Canada, a steady warm-up is expected to spread across the country from west to east through the next couple of days. Today will be the final day of the deep freeze over the East Coast where temperatures will start out in the teens but they will quickly rebound to near normal levels on Tuesday. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php