Nov 27, 2012 Storm Summary

November 27, 2012 Light Snow/Rain

nov27radarThe second snow event on November 2012 affected the region on 11/27, when a weak low pressure quickly moved through, producing light to moderate snowfall over Pennsylvania, northern New Jersey and southern New England and moderate rain elsewhere. Snow totals were minimal compared to the early November storm, but managed to peak at 4-6 inches in northwest NJ and northeast PA.



November 27, 2012 Storm Archive

November 22 – Storm Possible Next Week
November 23 – Light Rain/Snow Likely Tuesday
November 24 – Weak Storm For Tuesday
November 26 – Tuesday Rain/Snow, Then Cold Again
November 27 – Evening Update


Storm History

nov27trackAs a trough entered the region around November 25-26, a weak shortwave dived southeast through the northwest and central US, producing scattered rain/snow showers with no defined surface low pressure. Late on Monday, November 26, a broad, weak and disorganized low pressure began to take shape near Louisiana and Mississippi, spreading light rain showers to its north.

The low pressure began to become more consolidated on Tuesday afternoon, November 27, as it quickly moved through southeast VA but remained weak, with a minimum pressure of only 1019 millibars. Moderate precipitation meanwhile spread further north into the Mid Atlantic where temperatures aloft were below freezing, allowing snow to fall across parts of Pennsylvania and New Jersey. The low pressure quickly moved out overnight, moving offshore on Wednesday, November 28, as it slightly deepened to about 1010 mb.


Forecasting The Storm

This section will be added soon.


Storm Observations

Radar image from 9:08 AM, from the National Weather Service, showing widespread light-moderate precipitation covering the northern Mid Atlantic region. This fell in the form of snow in Pennsylvania and northern NJ.

nov27radarPrecipitation began to spread into the region early in the morning hours, with steady light to moderate snow falling in Pennsylvania by 8 AM. Around the same time, a band of light snow spread into northern NJ, with light precipitation covering the majority of the area by 10 AM. The rain/snow line remained mostly consistent along the I-95 corridor, with rain and non-accumulating snow in NYC, Long Island and coastal CT, and snow elsewhere. Between 10 AM and 1 PM, heavy snow affected northwestern NJ and SE NY, where the higher snow totals from the storm were observed. The precipitation gradually moved offshore in the mid-late afternoon, with NYC and locations further west drying up by 6 PM, while light rain in Long Island and snow in SE CT persisted for another few hours.


Storm Impact in the Northeast

The map below shows estimated snow totals from the storm across the region, based on storm reports from the National Weather Service. Actual totals may be slightly higher or lower than shown below. This map excludes lake effect snowfall.

nov27snowSnow totals associated with this storm were lower than those of the early November storm, although this storm still produced more snow in the area than many Novembers in recent years. Widespread totals of 1 to 3 inches fell from eastern Pennsylvania into northern NJ and southern New England, excluding coastal areas where mostly rain fell. The highest totals were found in northeast Pennsylvania and northwest NJ, where at least 4 to 6 inches of snow fell over the higher elevations. Another local maximum of 2-4 inches of snow focused over northeast CT and western Rhode Island.

Below is a list of selected snow reports across the area from the National Weather Service, listed by highest total from each county: (Some locations missing from this list)

Northern NJ:
5.0″ – Chester, NJ (Morris)
4.0″ – Wantage, NJ (Sussex)
4.0″ – Neshanic, NJ (Somerset)
3.5″ – Allamuchy Township, NJ (Warren)
0.5″ – Tenafly, NJ (Bergen)

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