Chris Izworski
Great Lakes · An hour-by-hour winter decision tool

Lake-effect snow: which snowbelt is favored?

Pick a place and watch the setup change. NWS hourly winds and snow forecasts tell one part of the story; official warnings tell another. NOAA lake temperatures provide context. Together they help you see when to pay closer attention—without pretending to know which street the band will cross.

A few degrees of wind shift can move the heaviest snow miles away. No map can honestly promise the exact track three days ahead.

Historic satellite imagery: NASA Earth Observatory / Terra MODIS, February 11, 2016. This is not a current forecast image. Image source.

Find your snowbelt

Location stays in your browser. The tool requests only the selected region from the server. These are representative snowbelt checkpoints, not exact snowfall footprints.

Choose a region to load current NWS evidence.

How the engine interprets lake-effect snow

Wind is a clue, not a forecast

Air traveling over comparatively warm open water can collect heat and moisture. Regional wind direction influences which shore is exposed. Shifts, vertical wind shear and local terrain determine where individual bands actually organize.

Lake temperature is background context

NOAA GLSEA reports a daily satellite-derived lakewide surface average. It does not measure the air temperature at 850 mb or identify a local band. A warmer lake alone does not guarantee snow.

Confidence is about evidence agreement

High, medium and low describe how complete and consistent official snow forecasts, surface wind alignment, alerts and fresh lake data are. These labels are not calibrated odds of snow or band-placement skill.

When data disappear

If NOAA or NWS is unavailable, the engine marks missing evidence. It will not quietly replace live observations with last year's typical snowbelt patterns or invent accumulation totals.