Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Fri Oct 25 2019 Valid 12Z Fri Oct 25 2019 - 12Z Sun Oct 27 2019 ...A low pressure system is expected to bring the potential of flash flood from eastern Texas into the lower Mississippi Valley... ... Another surge of cold air will be accompanied by another around of snow for the northern/central Rockies into the High Plains... ...Conditions favorable for the spreading of wildfires will remain across portions of California through today... An upper-level disturbance over the southern Plains is in the process of merging with a plume of deep tropical moisture arriving from the western Gulf of Mexico. The interaction between these two features will result in the formation of a relatively compact low pressure system which is forecast to track inland from the central Gulf Coast tonight and up into the Great Lakes by Sunday morning. In addition, a tropical low pressure center could also be in the midst to provide a more concentrated period of heavy rain mainly for eastern Louisiana into Mississippi by Saturday morning. There is still uncertainty regarding the timing and strength of this low pressure center. Nevertheless, 2 to 4 inches of heavy rain is forecast from the central Gulf Coast through the Mid-Mississippi Valley for the the next couple of days, leading to the potential of flash flooding. The system should gradually weaken as it tracks toward the Great Lakes on Sunday where rainfall amounts generally less than 2 inches are expected. Beginning Friday night, the next surge of cold air from Canada is expected to enter the interior Northwest into the northern High Plains. This will be accompanied by another around of snow spreading down the northern and central Rockies as well as the High Plains through the weekend. It appears that 6 to 12 inches of snow can be expected for these areas with locally high amounts possible over high elevations. As the cold air surges into the western U.S., the eastern U.S. will be warmer than average through the weekend. Meanwhile, an expansive high pressure in the western U.S. will continue to promote favorable conditions for the spreading of wildfires from northern California into southern California for one more day today. The greater threat today is expected to exist across the Transverse and Peninsular Ranges surrounding the Los Angeles and San Diego metropolitan regions with a combination of gusty winds and low relative humidities. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php