Show An area area of low pressure Is central over Alberta and nd a slight trough of low pressure covers the plateau region A ridge of high pressure extends from Manitoba southward to Texas Precipitation Precipitation tation has occurred over Washington Oregon northern Idaho western Montana Montana Mon lon tana and Illinois High temperatures continue west of the Rocky mountains mountain Temperatures from 10 to 12 degrees below below be be- low Jov ero ro prevail over the eastern por por- tl off tion the Dakotas |