Models Intimating A Welcome, Cooler Pattern Change Once Again /Update/

There is virtually no change from my earlier blog posted below back on 7/3/12. One more miserable day of heat on Saturday will draw to a close as the advertised cold front glides south through Southeast Lower Michigan. Scattered showers and thunderstorms will ignite as the cooler air clashes with heat. Look for refreshingly cooler and less humid air to prevail across Southeast Lower Michigan as mentioned previously;  at least  through mid week. Temperatures will flirt with average or normal readings for July with highs around 80 to the mid 80s; while lows fall into the mid and upper 50s to mid 60s.
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Original blog 7/3:
If you are tired of baking your ass with these temperatures in the 90s; this will certainly come as good news. The expected upper wind pattern discussed in the Summer Outlook and more recently in Dominant Ridge/Occasional Canadian Low will once again shift and allow cooler air to push down from northern and central Canada. This change to somewhat cooler weather will arrive behind a cold front slated to glide through over the weekend (early indications are sometime Saturday). The cooler, more comfortable air will infiltrate Southeast Lower Michigan late in the weekend and lasting into at least, midweek.

Note The Deep Upper Low in Canada and the Shift to a Northwest Flow

                                                                      8 AM EDT SUN

The expected change will come about as the dominant hot ridge of high pressure responsible for the heat across the country retrogrades further west and thus; the cool upper low in Canada digs south-southwest. This has happened with some regularity since the spring and why, we haven't been miserably hot for weeks on end.

There is a general consensus between the models with this pattern change which gives it a bit more credence. Timing is a bit of an issue with again; the front pushing thru sometime Saturday.  As the time gets closer will fine tune both it's timing and expected cooler temperatures. Preliminary indications are temperatures should drop back closer to normal levels of around 80 to the mid 80s. Hopefully this pans out, stay tuned!

Making weather fun while we all learn,
Bill Deedler -SEMI_WeatherHistorian