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1. This map shows the pressure pattern from early this morning, A strong surge of colder air was pouring into the Northeast:
2. This map shows the distribution of precipitation around the United States.
Disturbances that were over Montana and Nebraska will affect the Northeast at midweek. The first system will cause snow in Chicago later today but may fall apart before reaching the East Coast Tuesday.
3. The track of the midweek storm should be similar to the track taken by the storm that affected the Northeast Sunday. Early snow should change to sleet and then rain from Baltimore to Boston. In the Appalachians, a round of moderate to heavy snow may be followed by a temporary change to ice, then by snow showers as cold air returns. This map shows the GFS ensemble temperature forecasts for times before and during when the warmest part of the storm races by.
At this point, the 32-degree line is shown as being somewhere between northern Pennsylvania and northern Maryland.
The previous maps show individual members of the ensemble. This snowfall projection results from taking the average results. From central Ohio across central and northern Pennsylvania through central New England, expect challenging travel conditions from this storm.
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It will be more comfortable tomorrow and Thursday
It will become more comfortable after the cold front leaves.