Winter Storm Warning: 12+ Inches of Snow Tonight

UPDATE: March 18 9:30 p.m.  Nashua Christian Academy & HS will be closed Tuesday due to the expected storm. We'll bring you more closings and updates as we get them.

UPDATE: March 18, 9:30 A.M. Winter Storm Watch has been changed to a Winter Storm Warning by the National Weather Service: A coastal storm will move across the southern New England coastline tonight and Tuesday and deliver a period of heavy snow followed by sleet, freezing rain and then all rain for some Locations.

The final snowfall totals will be determined by the timing of the transition from all snow to mixed precipitation. This will result in treacherous travel conditions later tonight into at least Tuesday morning. There will likely be a high impact on the Tuesday morning commute across much of interior southern new England. Accumulations: Snow accumulation of 6 to 12 inches in the Merrimack and Connecticut valleys and 12 to 18 inches over the higher terrain of Hillsborough and Cheshire counties.

Original story begins March 18 5:46 a.m.: The National Weather Service has called for a Winter Storm Watch for Nashua and surrounding areas, from Monday evening through Tuesday afternoon. Heavy snow with accumulations between 10 to 14 inches are expected.

Heaviest snow will fall late Monday night into Tuesday afternoon, and sounds like it's going to devolve into a wintry mix, with icy overtones.

Snow totals and storm trajectory are still up in the air, quite literally, so stay tuned. I'll bring you updates as I get them.

Here's your week's worth of weather, ending on a sunny note:

• Monday Sunny, with a high near 36. Light and variable wind.
• Monday Night Snow, mainly after 1am. Low around 28. East wind 3 to 6 mph. Chance of precipitation is 80 percent. New snow accumulation of 3 to 5 inches possible.
• Tuesday Snow and sleet before noon, then rain and snow. Patchy fog before 9 a.m. High near 37. East wind around 9 mph. Chance of precipitation is 100 percent. New precipitation amounts between 1 and 2 inches possible.
• Tuesday Night Rain and snow showers likely before 9 p.m., then a chance of snow showers. Patchy fog. Otherwise, mostly cloudy, with a low around 27. West wind 8 to 10 mph. Chance of precipitation is 60 percent. New precipitation amounts between a tenth and quarter of an inch possible.
• Wednesday [First Day of Spring] A chance of snow showers before 3 p.m., then a slight chance of rain showers between 3 - 4 p.m., then a slight chance of rain and snow showers after 4 p.m.. Patchy fog before noon. Otherwise, partly sunny, with a high near 38. Chance of precipitation is 30 percent.
• Wednesday Night Mostly cloudy, with a low around 23.
• Thursday Cloudy, with a high near 40.
• Thursday Night Cloudy, with a low around 24.
• Friday Partly sunny, with a high near 42.