Marek Kučera 
There is an Enhanced Risk of Severe Thunderstorms this afternoon and evening across parts of the Northern High Plains, including southeast Montana, northeast Wyoming, and western South Dakota. The primary threats are severe wind gusts and large hail. Thunderstorms are expected to develop over mountainous areas in southwest Montana and northern Wyoming, moving east into increasingly moist and unstable air. Favorable wind patterns support supercell storm structures, which can produce significant hail and damaging winds.
In Colorado and Kansas, high temperatures in the 90s combined with steep lapse rates will trigger high-based storms with potential strong downdrafts. These storms may evolve into clusters that spread eastward, bringing damaging winds to western Kansas.
Along the Southeastern U.S. coast, Tropical Storm Chantal will bring a marginal risk of tornadoes to parts of South and North Carolina as low-level wind shear increases overnight.
For Sunday, a Slight Risk of Severe Thunderstorms covers much of the Central High Plains, where storms may produce large hail over 2 inches in diameter and wind gusts exceeding 75 mph. A shortwave trough moving southeast will enhance wind speeds aloft, combined with unstable conditions due to moisture advection and daytime heating, supporting severe storm development from southeast Wyoming toward western Kansas.
In the Maine region, fast-moving storms with damaging wind gusts are possible due to moderate wind shear and moderate instability.
A minor disturbance will trigger scattered thunderstorms in Missouri, central Illinois, and Indiana, but severe threats remain low, with small hail possible in some stronger cells.
In the eastern Carolinas, convection associated with Tropical Storm Chantal may produce an isolated tornado risk during the day.
Looking ahead to Monday, there is a Slight Risk for severe storms in the Central Plains, with large hail and damaging winds expected. Additionally, parts of New York and Maine may see fast-moving storms producing damaging gusts ahead of a cold front.
From Wednesday through the weekend, a stable upper ridge will build across the Southwest, while zonal flow over the northern U.S. will continue to allow isolated severe storms to develop across the northern Plains. However, exact timing and location of these storms remain uncertain.
This forecast highlights a period of active and potentially dangerous severe weather across the Northern and Central United States over the next several days, with multiple chances for large hail, damaging winds, and tornadoes, particularly in the High Plains and parts of the East Coast.
Source: https://www.spc.noaa.gov/products/outlook/
Marek Sadowski 
