A winter storm heavy snow warning is now active across parts of the United States, and the numbers are hard to ignore. The National Weather Service’s Weather Prediction Center has flagged a high risk of heavy snow for Monday, May 4, and Tuesday, May 5, with some areas in the Northern Sierra facing up to 48 inches of accumulation. The calendar may say May, but winter has not finished making its case.
Where the winter storm heavy snow warning is most severe
The storm originated over the Pacific and is now pushing east into the Western United States. The heaviest impact will fall across 3 areas in the first phase of the system. 1. The Northern Sierra, where winter storm warnings are currently active and snowfall totals could reach four feet in the highest elevations. 2. The Lake Tahoe region, which falls within the same warning zone and faces similar accumulation risks through Tuesday. 3. Mono County, also under an active warning as the storm works through the Sierra Nevada range.
The Weather Prediction Center has rated the heavy snow risk as high for both Monday and Tuesday. After that, the system shifts east. Starting Tuesday and running into Wednesday, the Colorado Rockies come into the crosshairs, with a high heavy snow flag now in place for that region as well. The storm is expected to weaken as it tracks further across the country, so areas beyond the Mountain West should not expect the same extreme totals. It is also worth noting that the most dramatic snowfall figures apply to high-altitude locations rather than lower elevations.
Why this storm is arriving in May
Late-season storms are not unheard of in the Mountain West, where elevation keeps conditions cold long after spring has arrived at lower altitudes. However, this particular system is notable for both its timing and its intensity. The Weather Prediction Center issued its report on Sunday, May 3, describing the storm as one that had been dominating the Pacific before turning east. The speed of the transition and the projected totals have drawn attention from meteorologists tracking the system.
For anyone with travel plans involving mountain passes in the Sierra Nevada or the Rockies this week, conditions could be dangerous. Road closures and travel restrictions often accompany warnings of this scale, and the combination of heavy snow and rising winds can make high-elevation driving extremely hazardous even for prepared drivers.
Cold air lingers across the Midwest and Northeast
While the Mountain West deals with active snowfall, the rest of the country is contending with a different kind of cold. The polar vortex that disrupted weather patterns in March and April has passed, but its aftermath is still being felt. AccuWeather lead long-range meteorologist Paul Pastelok explained that the event created what he described as an atmospheric traffic jam at the jet stream level. That disruption, known as a Greenland block, is keeping the jet stream buckled enough to allow waves of cold air to continue moving south from Canada into the Midwest and Northeast.
The good news is that conditions will not reach the severity of the Arctic outbreak that hit in mid-April. Even so, AccuWeather warns that some cold snaps could bring wet snow mixed with rain in extreme cases. Frost and freeze threats remain a real concern through the coming weeks.
What gardeners and farmers need to know right now
The cold air lingering across the Midwest and Northeast carries practical consequences for anyone working with crops or home gardens. Perennial crops including orchards, vineyards, and berry plantings are especially exposed when temperatures dip unexpectedly in May. Agricultural operations in affected areas will need to take protective measures to shield vulnerable plants from late-season freeze events.
For home gardeners, patience remains the safest approach. Warm-season vegetables like tomatoes and peppers cannot handle frost. A single cold night can undo weeks of preparation. The smartest move is to wait until the average last frost date for your specific area has clearly passed and both soil and air temperatures have stabilized before putting tender plants in the ground.
Source: Men’s Journal
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