Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 AM EDT Wed Jun 26 2019 Valid 12Z Wed Jun 26 2019 - 12Z Fri Jun 28 2019 ...Thunderstorms, some severe, forecast for the northern tier of the U.S.... Over the next couple of days, a slow-moving frontal boundary will remain stretched across the U.S. from the Great Basin eastward into the Northern Plains and Great Lakes region. Scattered thunderstorms are expected along and surrounding this front. These storms could be severe in the Northern Great Basin to Northern/Central Plains and into the Upper/Middle Mississippi Valley on Wednesday, where the Storm Prediction Center has delineated a Slight Risk. A few strong storms are also possible in the Lower Great Lakes region on Wednesday as the front moves a bit more quickly through that area. An Enhanced Risk of severe weather is currently outlooked for the Northern High Plains on Thursday, with a chance for some strong storms extending into the Upper Great Lakes region. All these regions could also see locally heavy rain and isolated flash flooding with these storms. An upper-level low will slowly push into the Pacific Northwest during the period, bringing a chance of rain there and even some snow mixing in for the highest elevations of the Cascades. Cold temperatures are also expected due to this upper low, with high temperatures 15 to 25 degrees below average for parts of the Pacific Northwest, down into northern California, and the western part of the Great Basin. Ahead of the trough, conditions are favorable for fire weather in the Central Great Basin to the Four Corners region, and Red Flag Warnings are in place. Summertime heat will prevail in most other parts of the continental U.S. Some scattered summertime thunderstorms are forecast from the Southern Plains into the Mississippi and Tennessee Valleys and into the Southeast over the next couple days. Localized flash flooding is possible in eastern parts of Texas with these storms. A weak trough of low pressure could form over Florida, leading to increasing rain chances there on Thursday. This will lead to slightly cooler temperatures in Florida on Thursday and Friday after near record-setting heat on Wednesday. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php