Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 AM EST Fri Jan 27 2017 Valid 12Z Fri Jan 27 2017 - 12Z Sun Jan 29 2017 ...Lake effect snow will impact areas downwind of the Great Lakes... ...High pressure is large and in charge across the continental U.S. through the end of the week... ...Temperatures will be 10 to 20 degrees below average over the Rockies into the Great Basin... Strong high pressure will dominate the weather across the western two thirds of the country through Sunday. Strong offshore wind will develop over the Southwest/Southern California producing Santa Ana wind over the region through Saturday. Meanwhile, cold air and upper-level energy will move over the Great Lakes producing lake effect snow downwind from the Great Lakes through Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php