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* WHAT...Heavy snow possible. Total snow accumulations greater than 18 inches possible. Winds could gust as high as 60 mph. * WHERE...Portions of central and northern New Hampshire. * WHEN...From Wednesday morning through late Thursday night. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. The strong winds and weight of snow on tree limbs may down power lines and could cause scattered to numerous power outages. Significant snowfall and periods of heavy snowfall rates will combine with low visibility to create very dangerous driving conditions. The hazardous conditions could impact the Wednesday evening and Thursday morning commutes. Gusty winds could bring down tree branches.