Environment Canada warns the GTA could get a big dose of snow or rain starting Tuesday night.

The agency says a low pressure system making its way north from Texas will likely bring "significant" precipitation.  They aren't able to predict yet if it'll be snow or rain or which areas will be worst hit.

If the mercury dips low enough for snow, The Weather Network says northern suburbs of Toronto could get up to 20cm worth, more like 10cm for spots closer to Lake Ontario.  The Weather Network is forecasting another 5-10cm of wet snow on Wednesday.