“A very tricky forecast this morning” are the words used by the National Weather Service in Louisville on its hazardous weather forecast for the next few days.

The hazardous weather outlook, for portions of south central Indiana and Central Kentucky, said no hazardous weather is expected today and tonight.

What happens in the days ahead is a little less clear.

A complex slow-moving low pressure system passing through the region this weekend will bring a mix of rain and snow to parts of the Ohio Valley Friday night through Monday morning, the Weather Service said, noting that it`s “too early to confidently give specifics with regards to snowfall amounts, accumulating snow does look possible especially for southern Indiana and north central Kentucky.”

The forecast did say that temperatures will be very chilly today, with highs struggling to get above the freezing mark in many locations. Skies should remain mostly clear overnight, and with very dry air in place and light winds near the surface, temperatures will plummet overnight into the lower 20s and upper teens.

Friday still looks like a dry day, the report said, but Friday night into Saturday will see widespread clouds and precipitation beginning Friday night. The weather trough is expected to gradually change its geographical orientation from nearly north-south Friday to more east-west by the end of the weekend as a dome of upper ridging builds over the northern Rockies. This will keep the trough and its associated inclement weather in the region for a few days, rather than the trough pushing right through.

After the first wave of precipitation comes through Friday night-Saturday, a second wave is expected, the forecast said, as weak surface low pressure crosses the Tennessee Valley Saturday night-Sunday. Precipitation amounts should be slightly less than what we see with the first wave as atmospheric moisture decreases slightly and the low will be slowly filling. Temperatures will be tricky and, of course, crucial in determining what kind of precipitation falls. Daytime highs should still be 4-7 degrees above freezing in southern Indiana and north central Kentucky both days of the weekend. Southern Kentucky may reach the lower 40s. Morning lows will be afew degrees either side of freezing.

A light rain/snow mix is expected to begin Friday evening as the atmosphere saturates, and then transition to all snow in most locations Friday night, according to the forecast. At least the southern half of Kentucky will change over to rain Saturday, with a rain/snow mix to the north. Locations along and north of I-64 should then go back to snow Saturday night while the rest of the region sees a rain/snow mix or even just plain rain. Sunday will see a mix. Some data suggests a small chance of some brief, light freezing rain around sunrise Saturday in north central Kentucky and southern Indiana. There are still questions as to just how much snow will fall.

Temperatures Friday afternoon around 40 should help to bring surface temperatures up, the forecast said, despite Friday morning lows around 20. The snow that falls will be falling with temperatures near freezing, making it a wet snow and thus perhaps making somewhat less impact on the roads. Also, temperatures will warm above freezing during the day Saturday and Sunday, further mitigating impact. Winds are expected to be very light throughout the weekend.