National Weather Service Marquette MI
9:46 AM Tuesday March 20.
waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. occasional wave height is the average of the highest 1/10 of the wave spectrum. synopsis, a 30.4 inch high centered over northern ontario this morning will move slowly east today. this high will extend a 30.4 inch ridge southward over the great lakes on wednesday through friday morning before finally exiting eastward. another high pressure system of 30.7 inches will move over northern ontario saturday as a 29.5 inch low traverses east through the central plains.