Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 AM EDT Thu Jul 24 2014 Valid 12Z Thu Jul 24 2014 - 12Z Sat Jul 26 2014 ...There is a slight risk of severe thunderstorms over parts of the Northern Plains... ...Temperatures will be 10 to 15 degrees below average over the Pacific Northwest... A front over the Northern Rockies to the Great Basin will move slowly eastward to the Upper Mississippi Valley by Friday evening. Moisture will be pooling ahead of the boundary over the Northern Plains to the Upper Mississippi Valley. Areas of showers and thunderstorms will develop in the moist air over the Central/Northern Plains that will move to the Great Lakes by Friday evening. In addition, showers and thunderstorms will develop along the U. S./Canadian border from the Northern High Plains on Wednesday to the Upper Mississippi Valley on Friday morning. By Friday evening, the showers and thunderstorms will expand southward along the front to parts of the Middle Missouri Valley. Additionally, upper-level energy moving over the Pacific Northwest will produce light rain over parts of the area through Thursday evening. A second front will move off the Northeast/Mid-Atlantic Coast on Thursday while the southern end of the boundary will linger over parts of the Central Gulf Coast and the Southeast Thursday afternoon into Friday evening. Showers and thunderstorms developing along the front will move off the New England Coast on Thursday morning. Additional showers and thunderstorms will develop along the boundary over the Tennessee Valley into the Mid-Atlantic on Thursday moving off the Mid-Atlantic Coast on Friday morning. Showers and thunderstorms will also develop over parts of the Southeast on Friday evening. Elsewhere, upper-level energy over the Central Gulf Coast will trigger showers and thunderstorms over parts of Texas and the Gulf Coast through Friday. Furthermore, moisture trapped underneath an upper-level ridge over the Southwest/Southern Rockies will produce areas of showers and thunderstorms over the area on Thursday and Friday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php