Summer sure doesn’t appear to be letting go anytime soon as our recent 7-day outlook suggests, but there are indications that our unseasonably hot and humid regime may take a back seat to the refreshing taste of fall in about 10 days. The big “tip of the cap” towards the cooler pattern? The PNA, or Pacific North American pattern, shifting from negative to positive. As shown below, both the European (top) and GFS (bottom) highlight the PNA shift to positive.
A positive PNA favors eastern troughiness and an associated cooler than normal regime over our neck of the woods.
Sure enough, models are trending towards a much cooler direction for week 2.
It’ll be fun to watch things unfold. For now, if you’re a fan of summer weather, be sure to enjoy the next week, or so, as things appear to be changing for the much cooler side of things around the 10th (give or take a day or two).