Geez, I was thumbing through KU Volume I today....and that's a spitting image of March 1958. At the surface, that one was a primary over OH, redeveloping near Norfolk. The end result was not pretty for most of NE. 30"+ over SEPA and NEMD. Good hit in Poconos, with another max near Fitchburg.
Also, I saw where K&U like the NAO block on the eastern shore of Greenland, not the Davis straight area.