Multi-Day Severe Weather System Threatens Broad U.S. Regions

A multi-day severe weather system is forecast to impact a broad area of the United States, extending from the Great Plains across the Midwest and Southern Plains to the Atlantic Seaboard. Millions of residents are within areas facing potential threats, including tornadoes, large hail, and damaging winds. The system is expected to progress from west to east over a 48-hour period, with varying impacts and timings across different regions.

Atmospheric Setup: Gulf Moisture & Low Pressure

The severe weather setup involves a powerful low-pressure system developing over the Midwest, drawing warm, unstable air and low-level moisture northward from the Gulf of Mexico. Early rain in Oklahoma and Kansas is not indicative of the primary severe weather expected later in the day.

By mid-afternoon, individual supercell storms are anticipated to develop across Nebraska, Kansas, and Oklahoma. These rotating storms are capable of prolonged activity and present a risk for very large hail. In Oklahoma and Texas, the dryline, a boundary between dry desert air and moist Gulf air, introduces an element of uncertainty; if atmospheric conditions allow storms to develop through a warm air cap, significant energy would be available.

Regional Impact & Progression

Central & Southern Plains: Hail, Tornadoes, and Nocturnal Threats

For Dallas and the North Texas region, individual storms are predicted to develop along a dryline in West Texas and move towards the I-35 corridor. Primary concerns for Dallas include large hail, potentially reaching baseball size, and the risk of tornadoes.

The low-level jet, a stream of fast-moving air above the ground, is expected to strengthen after sunset, increasing atmospheric shear and contributing to the likelihood of nocturnal tornadoes in these areas.

Midwest & Great Lakes: Bowing Clusters and Elevated Tornado Risk

Into the evening, individual supercells across the Plains are projected to merge into bowing clusters, forming a line of storms. This merger may reduce the tornado threat but elevate the risk of damaging winds. The storm line is forecast to move through Iowa and Missouri this evening and maintain strength into Illinois and Wisconsin overnight.

The Chicago region is under a Level 3 of 5 severe storm threat, as designated by the Storm Prediction Center, with the most severe conditions anticipated between 4 p.m. and 6 p.m. CT. The region faces threats of damaging winds and large hail, with an elevated risk of strong tornadoes (EF-2 or higher) noted, particularly for communities south of I-80. Conditions are conducive for supercell development, which could affect the evening commute and persist into the night.

Mid-South & Ohio Valley: Squall Line & High Winds on Sunday

The Storm Prediction Center has issued a Level 3 out of 5 risk for Sunday, covering the Mid-South and Ohio Valley, including cities such as Nashville, Indianapolis, Memphis, Louisville, and Little Rock. Primary concerns include a squall line of thunderstorms with straight-line winds potentially exceeding 70 mph. Tornadoes are also possible, both embedded within the squall line and as discrete storms. The threat is anticipated to begin between 2:00 p.m. and 4:00 p.m. CT, quickly organizing into a comprehensive weather system.

Deep South & East Coast: Long-Track Tornadoes and Widespread Wind Damage

A late-night phase of the event will shift the threat into the Deep South. Separate supercell thunderstorms could develop overnight across the Florida Panhandle, southeastern Alabama, and Georgia.

For Monday, the threat level is upgraded to a Level 4 out of 5 for Washington, D.C., and surrounding metropolitan areas, impacting the I-95 corridor.

Forecasters have expressed increased concern regarding the potential for long-track tornadoes and widespread wind damage. The severe weather is projected to continue until late Monday night.

Across the Atlantic Seaboard, from North Carolina through the Mid-Atlantic region, warm, humid air with dew points reaching the 60s is extending northward into Pennsylvania, contributing to the intensity of the developing storm line. High-altitude winds are projected to exceed 60 mph, expected to result in fast-moving thunderstorms. These conditions present two primary threats: individual supercell storms with the potential for strong, long-track tornadoes, and a widespread line of storms capable of producing significant wind damage by transferring high-altitude winds to the surface. The most critical period for severe weather in this region is anticipated from early afternoon through the evening commute. Atmospheric rotation levels are currently elevated, and breaks in cloud cover allowing solar heating could further increase the risk of intense tornadoes.

Public Advisory: Stay Alert, Especially Overnight

Residents in all affected areas are advised to monitor weather alerts, particularly as activity may occur overnight. It is recommended to enable weather alerts and have a clear plan for reaching safe shelter immediately upon the issuance of any warnings.

Nighttime tornadoes present heightened risks due to reduced visibility and the potential for individuals to be asleep when warnings are issued.