Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Thu May 09 2019 Valid 00Z Fri May 10 2019 - 00Z Sun May 12 2019 ...Flash flooding is likely for portions of central/eastern Texas into Louisiana through and Louisiana on Thursday and Friday, with severe weather possible as well... ...Late-season snowfall accumulations for the Colorado and New Mexico Front Range with heavy snow into the mountains... ...Record-breaking heat expected for the Pacific Northwest Friday and possibly Saturday... ...Temperatures will be well below average for the Central/Southern High Plains with temperatures below freezing Friday... A slow moving cold front currently extending from the Great Lakes to eastern and southern Texas will separate two very different weather regimes. Above average moisture and humidity will exist ahead of the boundary from the western Gulf Coast into the Northeast but with a Moderate Risk of flash flooding place from the middle Texas coast into central Louisiana and far southwestern Mississippi through Friday morning at which point the threat narrows to East Texas into western Louisiana extending into Saturday morning. In addition to widespread heavy rain over the past several days across some of these same areas, an additional 4-8 inches (locally higher) are forecast through Saturday evening from southwest of Houston into the central Texas/Louisiana border. A threat for severe storms will also exist near and ahead of the cold front with the Storm Prediction Center highlighting Marginal and Slight Risks from the Gulf Coast through the Ohio Valley today with Marginal Risks for Friday for similar locations with respect to the frontal boundary position. Behind the front, Friday morning minimum temperatures are expected to fall into the mid-20s to low-30s, prompting Freeze Watches and Warnings from eastern Colorado into central Nebraska and Kansas. High temperatures will be over 30 degrees below average across the Southern and Central High Plains on Friday supporting light accumulations of snow into the Front Range of New Mexico and Colorado while heavy snow falls in the San Juan and Sangre de Cristo Mountains of southern Colorado into northern New Mexico where over a foot of new snow is forecast through Saturday evening. Across the Northwest, an anomalous ridge of high pressure aloft will support record heat for the Pacific Northwest with record highs possible from Seattle to Portland for Friday. Saturday looks to have similar temperatures with the heat spreading eastward for Sunday into more interior locations. Farther south, locally heavy rain will be possible in connection with a slow moving upper level disturbance to impact portions of central California into the Four Corners region through the day on Saturday. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php