Meteorologist Ryan Hall is warning that a severe weather setup across the central and northern Plains is quickly becoming more concerning, with Saturday now standing out as the main day to watch for large hail, a brief tornado threat, and a possible nighttime “wind bomb” as storms merge into a damaging cluster.
In a new forecast on the Ryan Hall, Y’all channel, Hall said the Plains are “quietly loading up” for one of the more dangerous setups of the week, especially across western Nebraska and South Dakota, where the ingredients appear to be coming together more aggressively than earlier data suggested.
Hall said he is “a lot more worried about Saturday” than he was a day earlier, pointing to high-resolution model trends showing stronger wind shear and more storm fuel. That shift, he explained, is why the Storm Prediction Center already has a slight risk area drawn across parts of western Nebraska and South Dakota.
Saturday’s Bullseye Is Coming Into Focus
According to Hall, the main zone of concern includes areas such as Rapid City, Sturgis, Rapid Valley, and North Platte, with the broader bullseye focused west of Highway 83 and north of Interstate 80.
For places farther east, including Omaha and Sioux Falls, Hall said the worst of the afternoon setup may stay west at first, but he warned that those areas still need to pay attention because storms could organize into a damaging wind cluster later Saturday night.
That distinction matters because the first storms of the day and the storms later at night may behave very differently.
Hall said the most intense initial development is expected during the late afternoon and evening, roughly from 4 p.m. to 9 p.m. Saturday, when daytime heating should maximize instability. During that window, he said the atmosphere may support supercells capable of producing large hail and a brief tornado risk.
The biggest early concern, however, appears to be hail.
Hall warned people in the risk zone to get vehicles into a garage or under a carport before dinner Saturday, saying golf ball-sized hail could cause damage in some of the towns that end up under the strongest storms.
This is one of those weather setups where the details will matter a lot. A small shift in where storms first fire could decide which community gets a rough evening and which one only watches lightning in the distance.
Why The Atmosphere Is Becoming So Unstable
Hall said the setup is being driven by a wave of energy ejecting across the northern Rockies, which is expected to pull a large amount of energy into the Plains.
At the same time, an upper-level low swinging across the northern Rockies will help anchor a broader blocking pattern. Hall described this as part of the same larger pattern responsible for a stalled, wet setup across the Southeast, but said the Plains will be dealing with the other side of that block.
The key ingredient, he explained, is cold air aloft spreading over a hot afternoon at the surface. When cold air rides over warm, moist air near the ground, instability can increase quickly, and Hall said the atmosphere may be “absolutely primed to detonate” across parts of the Plains.
He also pointed to dew points surging into the low 60s in western South Dakota, calling that moisture “gasoline” for storms this far north when paired with cold air aloft.
That kind of language may sound colorful, but the point is simple: the air near the ground may become warm and humid enough to feed storms, while the air above it remains cold enough to help them rise fast and hard. That is often how explosive severe storms get started.
Hall said storms could begin forming around 4 or 5 p.m. Saturday, and once they do, they may keep feeding on warm, moist inflow as they strengthen.
He also said an enhanced risk could become possible if the ingredients continue trending worse, though for now the official outlook remains at slight risk.
The Tornado Threat Is Not The Main Concern, But It Is There
Hall made clear that the tornado threat is not his top concern in this setup, but he did not dismiss it.
He said a brief tornado could be possible early in the storm cycle, especially when the storms are still discrete supercells. That would be before they begin merging into a larger cluster.
This is an important part of the forecast because people sometimes hear “not the main concern” and assume there is no concern at all. Hall’s message was more careful than that: the tornado threat may be lower than the hail and wind threat, but the first storms of the day could still rotate enough to produce a brief tornado.
For anyone with outdoor plans in western Nebraska or South Dakota on Saturday afternoon, Hall recommended having a backup plan and a reliable way to receive warnings.
He also used the forecast to mention Y’all Call, his warning service, saying the scenario is exactly the kind of setup it was built for because warnings may need to reach people who are away from home or on rural roads.
A Nighttime Wind Cluster Could Extend The Threat
The part of the forecast Hall seemed most concerned about was what could happen after the first round of storms matures.
He said Saturday becomes more dangerous not only because storms may fire, but because of how they could evolve after sunset. Once individual supercells merge together, he said the threat may shift from large hail toward a wider area of damaging straight-line winds.
Hall described the possibility of a mesoscale convective system, or a large cluster of storms, surging eastward after the initial supercells combine.
That is where the “wind bomb” idea comes in. Hall said gusts of 60 to 70 mph could develop, which would be strong enough to knock out power, tear shingles from roofs, and bring down full-size trees across roads.
He said that type of cluster could continue into the overnight hours and reach areas farther east than the initial highlighted risk zone. Places such as Sioux Falls and Omaha may not be in the center of the early-afternoon bullseye, but Hall said they could still deal with a late-night storm complex if the system organizes.
The uncertainty is real, though. Hall said forecasters may not know whether the nighttime cluster truly develops until the day of the event because small-scale ingredients will determine how storms behave.
That is often the frustrating part of late spring and early summer severe weather. The broad signal may show danger, but the exact towns affected sometimes do not become clear until storms are already forming.
Southern Plains Are Not In The Bullseye, But Not Clear Either
Hall also warned that the threat is not limited to the northern Plains.
He said a broader marginal risk stretches from central Kansas into Oklahoma and northwest Texas on Saturday, including areas near Wichita, Tulsa, Oklahoma City, Norman, and Abilene.
The setup farther south is different, Hall explained, with a dryline and surface trough interacting with a very moist atmosphere. He called the moisture level across Kansas “tropical level juice for May,” which means any storm that does form could produce heavy rainfall.
Hall said not everyone in that southern zone will see storms because activity may stay isolated. But any storm that does form could become strong enough to produce large hail, damaging wind gusts, and intense rainfall.
He warned drivers along Interstate 35 to stay aware of changing conditions, especially because isolated storms can become dangerous even when the overall risk category looks lower.
That is a useful reminder. Marginal risk does not mean harmless weather; it often means the danger is more scattered, not nonexistent.
Friday Is The Warm-Up Before A Stormy Pattern Continues
Before Saturday’s main event, Hall said Friday will bring a lower-end severe risk across parts of the southern Plains, central High Plains, western Montana, eastern New Mexico, the Texas Panhandle, and Oklahoma.
He called Friday the “warm-up act,” saying it does not look like a widespread outbreak, but isolated storms could still produce hail, gusty outflow winds, and a few microbursts.
A microburst, as Hall described it, is a sudden violent blast of wind and rain. These can be short-lived, but they can still cause damage, especially for drivers, outdoor events, and loose objects.
Beyond the weekend, Hall said the active pattern may continue into early next week, even though the Storm Prediction Center has not yet drawn specific risk areas for days four through eight.
He said he is personally watching a corridor of extreme instability that could set up from Nebraska and Kansas into Missouri. In that kind of environment, he warned, storms may have “everything they need handed to them.”
Hall also emphasized that some of the biggest late-May and early-June tornado events do not always show up as obvious signals a week in advance. Instead, they can emerge from extreme instability and smaller-scale weather features that only become clear on the day they happen.
Flooding, Snow, Fire Weather, And A Quiet Zone
Outside the severe weather threat, Hall also pointed to other weather hazards unfolding across the country.
In Montana and Wyoming, he said a blocking pattern will bring a marginal risk for excessive rainfall, with particular concern for burn scars where heavy rain can quickly cause mudslides and debris flows.
He also said snow levels may drop to around 6,000 feet in parts of the West, which is unusual for late May even if not completely unheard of.
Farther south near the Four Corners, Hall warned that gusty winds, low humidity, and dry conditions could create a wildfire risk. He said a spark from something as simple as a dragging trailer chain or a cigarette could become dangerous under those conditions.
Meanwhile, Florida and parts of the Southeast remain stuck under a wet pattern. Hall said training thunderstorms could bring flooding concerns from Miami through West Palm Beach, with some areas possibly receiving several inches of rain.
Still, not everyone is looking at rough weather. Hall said parts of the central Great Lakes and Ohio Valley should enjoy excellent weather Friday as a Canadian high settles in, bringing clear skies, dry air, and comfortable conditions to places such as Columbus, Pittsburgh, and Grand Rapids.
But the broader message of his forecast was that the quiet weather will not last everywhere.
For western Nebraska and South Dakota, Saturday is the day to watch closely. Hall’s concern has clearly increased, and the setup now has the look of a severe weather event that could begin with big hail and isolated tornado potential before turning into a damaging nighttime wind threat.
The exact details may still change, but the signal is strong enough that people in the risk zone should already be thinking about where they will be Saturday afternoon and how they will get warnings if storms go up fast.
Mark grew up in the heart of Texas, where tornadoes and extreme weather were a part of life. His early experiences sparked a fascination with emergency preparedness and homesteading. A father of three, Mark is dedicated to teaching families how to be self-sufficient, with a focus on food storage, DIY projects, and energy independence. His writing empowers everyday people to take small steps toward greater self-reliance without feeling overwhelmed.
