Posted: August 21, 2012
After a relatively moist period, much of the state will turn noticeably drier during the next week. In fact, apart from some isolated thundershowers on Wednesday afternoon and again later Sunday, the vast majority of the Commonwealth will have little substantial rainfall (<.10 inch) through next Tuesday. During this dry time, temperatures will rise back above seasonal levels and reach sultry values later in the weekend. While sunshine will return for most midday and afternoons, the mornings will be dominated by ribbons of thick fog, most common in the river valleys. Very light winds are expected into the weekend, but an active breeze from the southwest will develop early next week. The Tropics may play a role in the state’s weather during the middle or later part of next week (August 29-31). A developing tropical storm, Isaac, will move through the Windward Islands and then trek either just north or south of the major islands by the weekend. Most of the computer simulations place Isaac near or over Florida early next week. Beyond this, its future movement will depend on the timing of cool fronts poised over the Great Lakes region. There is approximately a 30% chance that moisture from Isaac will bring rain, perhaps quite heavy, to parts of the state next Wednesday or Thursday. Odds favor a push of cooler, drier air from Canada to arrive for the Labor Day weekend.
The longer range outlook for early autumn points toward drier than normal weather in September with a shift to below seasonal readings in October. There are signs that point to sharply colder weather in the late autumn with several wintry storms affecting the region even before astronomical winter begins.
- State Climatologist