Weather radar can detect snow, but it’s noticeably less reliable at it than at detecting rain, mainly because snowflakes reflect far less energy than raindrops and because the radar beam frequently overshoots shallow winter storm systems entirely.
Why Snow Is Harder for Radar to “See”
Snowflakes are less dense and reflect radar energy much less efficiently than liquid raindrops of a similar size, which means a genuinely significant snowfall can sometimes show up as only a faint, unimpressive signal on radar, understating how much is actually falling.
The Beam Overshoot Problem Gets Worse in Winter
Because winter storm clouds are often shallower than summer thunderstorms, and because the radar beam rises with distance from the tower (the same effect covered in our piece on why radar sometimes shows nothing when it’s raining), the beam can pass entirely above a shallow snow band once you’re 60-100+ miles from the nearest station, making moderate snow disappear from the map even as it piles up on the ground.
Radar Can’t Tell You Snow Accumulation Directly
Radar shows precipitation intensity, not snow depth. Converting that signal into an actual accumulation estimate requires additional assumptions about temperature and snow-to-liquid ratio, which is why snowfall forecasts rely on computer models and ground reports at least as much as radar itself.
What Radar Is Still Good For in Winter
Despite its limits, radar remains excellent at showing you the general shape, timing, and movement of an approaching winter system, including the rain/snow transition line during a mixed-precipitation event. Watching a live radar map as a system approaches still gives you a solid sense of when precipitation will start and roughly how long it will last, even if the exact snow totals need to come from a forecast rather than the map alone.
In Conclusion
Radar is a genuinely useful winter storm tool, just not a perfectly accurate one. Use it to track timing and movement, and lean on official snowfall forecasts for how much will actually pile up.
