Posted: 7/18/2009 10:31:00 AM

High pressure nosing in from the southwest will keep the weekend dry. Skies started out cloudy this morning, but we should see gradual clearing through the afternoon. This will help high temperatures into the low 80's. On Sunday, drier air will be advecting westward, contributing to mostly sunny skies.

Model guidance continues to support a shift in the overall pattern with ridging building over the west Atlantic and the mean trough axis shifting into the Great Lakes regions. This will develop a strong baroclinic zone along the east coast helping moisture transport into the region. With weak shortwaves riding northeast through the week, rounds of showers and thunderstorms, locally heavy, will be common across New England. Expect highs generally around 80 and lows in the low 60's.

Atlantic ridging takes a brief break Friday and Saturday with an upper low moving north of New England. That low will then lift toward Greenland, forcing a rising NAO with a resurgence of the ridge to the south. A near tropical airmass will be transported into the region early next week on southerly flow. Count on a threat for thunderstorms each afternoon. Highs in the 80's, possibly touching 90 on Monday.





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