A second winter storm is tracking toward the Northern Plains and Upper Midwest, threatening to pile heavy snow and dangerous ice on top of what the first system already delivered. NOAA’s Weather Prediction Center has issued forecasts calling for widespread snow totals exceeding 8 inches, with localized accumulations of 12 to 18 inches in the hardest-hit areas. The storm window runs from Saturday through Monday, and the combination of back-to-back systems raises the risk of compounding travel disruptions and power outages across a region that has barely had time to dig out.
What is verified so far
The WPC’s Probabilistic Heavy Snow and Icing Discussion, valid from 00Z Saturday April 4, 2026, to 00Z Tuesday April 7, 2026, explicitly describes this event as the second of back-to-back systems bringing additional heavy snow and icing to the Northern Plains and Upper Midwest. The discussion lays out the meteorological mechanics, the storm’s track and deepening, a warm nose aloft that creates a layer of mixed precipitation, and the geographic boundaries separating snow from sleet.
The WPC’s Key Messages graphic puts concrete numbers on the threat. Forecasters project widespread snow greater than 8 inches with local totals of 12 to 18 inches. Alongside the snow, an icing corridor threatens a band of freezing rain accumulation, and the graphic includes explicit travel and power-impact language, warning that ice-laden trees and power lines could cause outages.
The sequential nature of these storms matters more than the raw totals suggest. When a second heavy snow and ice event arrives before the first round has fully melted or been cleared, cumulative ice loads on power lines, tree limbs, and rooftops can exceed what either storm would produce alone. That dynamic is what separates a manageable snow event from one that strains emergency resources and utility crews already stretched thin.
WPC probability maps show threshold-based chances for snow accumulation at 4 inches, 8 inches, and 12 inches, along with probabilities of freezing rain reaching at least 0.25 inches. These probability products cover the northern United States and give emergency planners a range of scenarios rather than a single deterministic forecast. The probabilities are generated using FRAM-based ice accretion methodology, which accounts for temperature layers in the atmosphere to determine where rain freezes on contact with surfaces versus where it falls as snow or sleet.
Impact forecasts signal moderate to major disruptions
Beyond raw snowfall numbers, the WPC publishes a Winter Storm Severity Index that translates weather data into impact categories. The probabilistic version of this index extends out to Day 7 and assigns probabilities of Minor, Moderate, Major, and Extreme impacts. Its components include ice accumulation and blowing snow, both of which can turn a heavy snow event into a full-blown infrastructure crisis when they overlap.
The deterministic WSSI view for Days 1 through 3 breaks impacts down by component: snow amount, snow load, ice accumulation, and blowing snow. This distinction matters for readers trying to gauge personal risk. A storm that scores high on snow amount but low on ice accumulation is a shoveling headache. A storm that scores high on both creates conditions where roofs can collapse, power stays out for days, and roads become impassable even after plows make a pass.
Most coverage of winter storms focuses on headline snowfall totals, but the ice component often causes more lasting damage. A quarter-inch of ice accumulation can snap tree branches and down power lines. When that ice forms on top of 8 or more inches of heavy, wet snow, the combined weight on infrastructure is significantly greater than what snow alone would produce. The back-to-back timing of these two storms means utility crews responding to outages from the first event may still be in the field when the second wave hits.
In addition to the WSSI, forecasters are also using medium-range guidance to understand how the broader pattern supports these storms. The WPC’s extended forecast discussion, available in its medium-range outlook, describes a persistent trough over the western and central United States that favors repeated storm development tracking into the Plains and Upper Midwest. This larger-scale setup increases confidence that the second system will have ample moisture and cold air to work with, even if the exact placement of the heaviest bands remains uncertain.
What remains uncertain
Several gaps in the available data limit how precisely anyone can predict the storm’s worst effects. No individual National Weather Service offices have released city-specific snowfall records or localized accumulation totals that would let residents compare this event to historical benchmarks in their area. The WPC products provide national-scale probabilities, which are useful for regional planning but leave open questions about whether, say, a specific corridor in Minnesota or Wisconsin will see 8 inches or 16.
State emergency management agencies have not issued public statements about preparedness or response plans tied to this second storm. The WPC’s impact indices suggest travel hazards and power outages are likely, but without direct confirmation from state-level officials, the scale of pre-positioned resources and shelter availability is unknown. Local decisions on school closures, road restrictions, and opening warming centers typically depend on short-range forecasts from nearby NWS offices, which will refine snowfall and icing expectations as the storm approaches.
Aviation impacts also remain unclear. The WPC’s severity index includes components relevant to flight operations, but no storm-specific flight delay projections have been published. Similarly, no official economic or infrastructure cost assessments have been released by NOAA or any other federal agency, leaving quantitative estimates of recovery costs unaddressed. Readers planning travel through the Northern Plains or Upper Midwest between Saturday and Monday should monitor local NWS offices for updates as the storm’s track becomes more defined and as airlines issue their own waivers or rebooking policies.
How to read the evidence
The strongest evidence backing this forecast comes directly from the WPC, which sits within NOAA’s National Weather Service. The GIS data layers that underlie the public-facing probability maps enumerate Day 1 through Day 3 chances of exceeding 4, 8, and 12 inches of snow, plus icing above 0.25 inches. These are the raw data behind the colored contours that most users see on the WPC site, and they allow emergency managers and researchers to ingest the information into their own mapping tools and decision-support systems.
Because these products are probabilistic, they are designed to capture uncertainty rather than hide it. A 50 percent probability of 8 inches of snow in a given county does not guarantee that outcome; it signals that, based on current model guidance and ensemble spread, forecasters see that amount as an even-odds scenario. Lower probabilities at higher thresholds, such as a 10 to 20 percent chance of 12 inches, highlight where a smaller fraction of model solutions cluster around more extreme outcomes. For planners, that combination of moderate probabilities at moderate thresholds and low probabilities at high thresholds is often more informative than a single deterministic snowfall map.
The heavy snow and icing discussion, the key messages graphic, the winter weather probability maps, and both versions of the WSSI all point in the same direction: a high-confidence expectation of disruptive winter weather layered on top of recent impacts. The remaining questions center on where the sharp gradients set up (those narrow zones where one town gets mostly rain and slush while the next town north deals with a foot of snow and a glaze of ice). That is why forecasters emphasize staying tuned to updated outlooks as new model runs come in and as the storm begins to be sampled more directly by weather balloons and radar.
For residents and travelers, the practical takeaway is to treat this second storm as more than a routine snow event, especially in areas that took the brunt of the first system. Even if final totals fall on the lower end of the forecast range, the cumulative stress on trees, power lines, and transportation networks can still be significant. Using the WPC tools in concert, reading the probabilistic snow and ice forecasts, checking the impact-focused WSSI maps, and following local NWS briefings, offers the clearest picture of risk as this back-to-back winter pattern continues to unfold.
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*This article was researched with the help of AI, with human editors creating the final content.
