Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 253 PM EST Tue Nov 07 2017 Valid 00Z Wed Nov 08 2017 - 00Z Fri Nov 10 2017 ...Heavy rain possible for parts of the southern Plains on Wednesday... ...An unsettled and wet pattern is in store for the Northwest U.S. by tomorrow... ...Below normal temperatures expected to persist through the week for most areas east of the Rockies... A cold front pushing southward through the Deep South this afternoon will keep showers and thunderstorms in the forecast tonight and into tomorrow from the southern Plains to the Southeast/southern Mid-Atlantic. Additional energy in the upper levels moving through will also increase the chances for moderate to heavy rainfall across portions of the Southern Plains on Wednesday. On the northernmost edge of the precipitation shield, snow or a rain snow mix may be possible across parts of the southern and central Rockies and even into the Texas and Oklahoma panhandles. Surface high pressure will dominate behind the front which will allow for cooler than average temps for much of the area from the southern Plains to the Mid-Atlantic. Afternoon high temperature readings could be as much as 10 to 20 degrees below normal the next few days. A frontal system moving into the Pacific Northwest on Wednesday will begin a period of unsettled and wet weather across much of the Pacific Northwest, northern California, the Intermountain West, and northern Rockies the next few days. Expect rain across the lower elevations, with snow in the highest of the terrain. Light freezing rain is also possible for some of the lower elevations of the Cascades as well as the northern Rockies. Elsewhere, a cold front dropping southward from the northern Plains to the upper Great Lakes will allow for snow showers with some light accumulations possible across parts of the Upper Great Lakes. Behind the front, very cold temperatures are expected as a modified arctic airmass begins descending southward from central Canada. Afternoon high temperatures across parts of the far northern Plains could be hovering near the 20 or 30 degree mark, which is almost 20 degrees below normal for this time of the year. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php