Western Lake Ontario: Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 21 May 2013 Today Tonight and Wednesday At 3:00 a.m. EDT today low 998 mb located over northeastern
South Dakota.
By 3:00 a.m. EDT Wednesday low 1005 mb located over northern
Lake Huron.

At 3:00 a.m. EDT today ridge located on a line east-west over
northwestern Ontario.
By 3:00 a.m. EDT Wednesday ridge located on a line
northwest-southeast over Manitoba.