755 FXUS01 KWBC 291834 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 233 PM EDT Mon Jun 29 2026 Valid 00Z Tue Jun 30 2026 - 00Z Thu Jul 02 2026 ...Severe thunderstorms possible across the north-central and northeastern U.S. through Tuesday... ...Dangerous heat for the central and eastern U.S.; below normal temperatures for the West... A strengthening low pressure system will track across southern Canada and push a frontal boundary across the north-central U.S. over the next couple days. Several upper-level shortwaves will interact with the front and support rounds of showers and thunderstorms from the central High Plains to the Upper Midwest through Tuesday. Warm, moist air combined with moderate instability will allow for the development of isolated to scattered severe thunderstorms that will be capable of producing damaging winds, hail, and locally heavy rainfall. Severe thunderstorms will also be possible in the Northeast on Tuesday evening as a warm front lifts north and an upper-level shortwave moves southeast across the region. Scattered showers and thunderstorms will also be possible across the Southeast as a slow-moving cold front sinks towards the Gulf Coast and in portions of Texas and New Mexico where southeasterly flow will funnel Gulf moisture into a convergence zone over the southern High Plains. Locally heavy rainfall may result in isolated instances of flash flooding, especially near steep terrain and in urban or poor-drainage areas. For the rest of the central and eastern U.S., a strengthening ridge of high pressure will result in dangerous heat this week, with high temperatures in the 90s and lower 100s. High humidity values will result in heat indices between 105-115 degrees across the Midwest and Mississippi Valley through Thursday and across the Ohio Valley and East Coast later this week. Overnight cooling will be limited by temperatures only dropping down to the 70s. The combination of prolonged daytime heating and limited nighttime relief will increase the risk of heat-related illnesses, especially for vulnerable populations and those without adequate cooling. In the West, persistent upper-level troughing will result in below normal temperatures across the region through at least mid-week. Dolan/Oudit Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$