Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 323 AM EDT Sat Oct 20 2018 Valid 12Z Sat Oct 20 2018 - 12Z Mon Oct 22 2018 ...Heavy rainfall and localized flash flooding possible across parts of central and southern Texas... ...Cooler conditions settle across the eastern U.S. this weekend as elevated fire weather for southern California continues... Heavy rain that has plagued central Texas will begin to wind down today--with some lingering light showers. However, there still remains two areas of heavy rainfall that will impact the state. A deep pocket of moisture will remain along the middle and deep south Texas coast. For today, the heaviest rainfall will remain just off the coast. The Big Bend region will also see showers and thunderstorms that could lead to localized flooding. Later on Sunday and into Monday, south-southwesterly flow will pull moisture inland across deep south Texas and will interact with the coastal trough. As a result, heavy rain is expected along with the possibility of flash flooding--with flash flood watches issued for the Brownsville area. Elsewhere, showers and thunderstorms will continue moving along the cold front today from the Mid-Atlantic to the lower Mississippi Valley. Because this front will be quick moving, flash flooding will not be a concern but there could be isolated heavy downpours. The cold front will exit the East Coast late Saturday night and will push southward across northern Florida--and with it light showers. This boundary will make its way toward the Florida Keys before stalling on Monday. Consequently, showers and thunderstorms for South Florida and the Keys on Sunday night through Monday. Farther north in the Upper Midwest, Great Lakes, and northern Appalachians, cold air filtering behind the front may allow for light snow showers across these regions. As surface high pressure builds across most of the eastern U.S. behind the cold front, high temperatures will be 10 to 20 degrees below normal. Florida will remain quite warm today; however, as the cold front finally pushes south, the northern portion of the state will have high temperatures dip nearly 10 degrees below normal with the southern half of the state experiencing near normal temperatures on Sunday. Meanwhile, upper level riding over the western U.S. will keep conditions much warmer than normal through the weekend and into the beginning of the workweek. These conditions combined with low humidities and gusty Santa Ana winds will lead to elevated fire weather threat for southern California, including the greater Los Angeles and San Diego regions. Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php