National Weather Service Chicago/Romeoville IL
2:54 AM Thursday June 29.
waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.
synopsis, low pressure of 29.5 inches over western lake superior
will fill to 29.7 inches as it moves to east-central ontario by
this evening. the low will drag a cold front across the lake and
extend west across the lower great lakes into the central
plains, while remaining nearly stationary. another low of 29.5
inches will develop tonight along the western end of the front.
this low will slowly track east through the lower missouri valley
to the ohio valley by saturday. low pressure of 29.8 inches is
also expected to develop over south-central canada tonight. this
low should slowly deepen as it moves into eastern ontario saturday
with the trailing cold front pushing across the lake saturday
night or sunday morning. high pressure of 30.1 inches is expected
to build across the central plains sunday night and monday.