Some of the roughest mornings in North Tonawanda aren't the snowy ones at all — they're the clear ones after a thaw, when meltwater runs, locks up overnight, and the approaches to the canal bridges come up glazed. Shevlet Enterprises Inc. plans for both kinds of weather: plowing through the storms and treating for ice when the thermometer swings. Driveways, lots and walkways get opened, snow gets stacked out of the traffic pattern, and the surfaces that refreeze first get watched the closest. The payoff is a property people can cross at six in the morning without once thinking about their footing. Snow removal in North Tonawanda, Tonawanda, Wheatfield and Pendleton.