National Weather Service United States Department of Commerce

Strong Storm System Brings Heavy Mountain Snow to the Sierra Nevada and Critical Fire Weather Conditions to the Plains

A Pacific storm system will continue to bring low elevation rain and mountain snow to much of the West through Wednesday, with heavy mountain snow expected in the higher elevations of the Sierra Nevada. This system will also bring strong winds to the Intermountain West, Rockies, and Plains, which will create Critical fire weather conditions for the High Plains. Read More >

Destructive Early Season Snowfall in Southern and Eastern PA
An early season winter storm brought generally 3-8 inches of snow to Southern and Eastern PA on October 29th, 2011. The storm was a classic Nor'Easter, deepening rapidly late Friday Night and Saturday (29th) as it moved up the East Coast - just off shore. The storm produced gusty winds on Saturday in Southeastern PA, knocking down trees and power lines, interrupting electric service to more than 400,000 homes and businesses across the state. Many trees still had leaves on them, and the heavy, wet snow (snow to liquid ratios were anywhere from 6:1 to 12:1) weighed down the trees and led to widespread damage.

Snowfall Accumulations for 29 October 2011 (inches)

 

Snowfall Accumulations for 29 October 2011 (inches)


Lightning strike on Radar Mosaic 18z (2 pm EDT)

 

 

Lightning strike on Radar Mosaic 18z (2 pm EDT)


IR Satellite Image of the Nor'Easter deepening off the coast at 18z (2 pm EDT)

 

 

IR Satellite Image of the Nor'Easter deepening off the coast at 18z (2 pm EDT)