January 21–26, 1987
Other Factors: PNA Pattern
Other Factors: Positive PNA Pattern
Other Factors: PNA Pattern
Other Factors: PNA Pattern
Other Factors: PNA Pattern (Euro forecast for March 1, 2006)
PNA Index (Blizzard of 2006) PNA was strong positive during the storm.A strong positive PNA promotes ridging over the West coast and a trough over the East Coast. With this setup a shortwave (low) is better apt to develop into a storm and then ride up the Eastern seaboard.
PNA Index (February 14-17, 1958)
PNA Index (March 18-21, 1958)
PNA Index (December 10, 1960)
PNA Index (January 18, 1961)
PNA Index (December 23-25, 1966)
PNA Index (February 5-7, 1967)
February 5, 1978
February 18, 1979
February 10, 1983
February 24 and February 28, 2005
January 22, 2005
December 5 – 7, 2003
February 15-18, 2003
February 5 and February 22, 2001
January 20, 2001
December 30, 2000
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