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Projected snow totals March 13-15, 2017.

(NWS)

An updated forecast is calling for 18 or more inches of snow by early Wednesday in some parts of the midstate, says an update this morning from the National Weather Service at State College.

The eastern half of the central Pennsylvania region is expected to see a foot or more of snow, with parts of the middle- to lower Susquehanna River valley seeing 18 or more inches, NWS said. Harrisburg should see around 16 inches, with higher amounts to the north and east.

A winter storm warning is in effect for Pennsylvania from 8 p.m. Monday night through 10 p.m. Tuesday for heavy snow, said the National Weather Service.

Snow will develop this evening, and travel will become extremely difficult by late tonight over most of the region, NWS says.

AccuWeather expects snow to start in the midstate around 8 p.m.

NWS says it should start around midnight, with lighter snow possible earlier.

Snow covered roads and poor visibility will impact the region overnight through Tuesday afternoon. Additional lighter snowfall will persist through Tuesday night.

The public is advised to make storm preparations during daylight hours today, and make plans to avoid unnecessary travel tonight through Tuesday, as extremely hazardous travel conditions are expected.

For the latest forecasts, visit PennLive's weather page.

You can see live weather updates via the National Weather Service and other Twitter sources below.

Tweet us at @pennlive with photos of inclement weather at your place, incidents you see on your commute or send a submission to submissions@pennlive.com.

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