Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 305 AM EDT Mon Jun 26 2017 Valid 12Z Mon Jun 26 2017 - 12Z Wed Jun 28 2017 ...Temperatures will remain above normal today for much of the West, but a cooling trend is on the way... ...Severe thunderstorms possible across the central and northern plains on Tuesday... The upper level ridge of high pressure which has brought extreme heat to much of the western U.S. in recent days will finally begin to break down over the next couple days, with relief in sight for many areas. One more day of hot temperatures is expected today. While the Pacific Northwest will not see the extreme heat of Sunday, temperatures will remain above average for many areas. Temperatures will soar into the 90s for portions of the northern Intermountain West and the valleys of the northern Rockies. A cold front forecast to move into the northwestern U.S. and northern Rockies Monday night into Tuesday will bring an end to the heat along with scattered showers and thunderstorms. High temperatures Tuesday and Wednesday will be much closer to seasonal average from the Northwest to the northern Rockies. The Southwest will remain slightly above average, but temperatures are not expected to soar to the extreme levels seen in recent days by Tuesday and Wednesday. As this frontal system moves from the Rockies to the Plains, showers and thunderstorms are expected to develop across the central and northern plains by Tuesday afternoon, some of which could be severe. Refer to products issued by the Storm Prediction Center for further details on the severe weather threat. Farther east, an upper-level trough will keep temperatures generally near or below average into midweek for the eastern half of the country. Scattered showers and thunderstorms will be possible each day along the Gulf Coast, primarily during the afternoon and evening. Areas of showers and storms will also be possible today and Tuesday from the Great Lakes to the Northeast in association with a passing upper-level disturbance. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php