upslope

Key Messages:

1. A cold front will bring a period of light rain and showers through this evening followed by fair weather on Monday as high pressure builds in

2. A cooler and unsettled pattern sets in for the middle and later portion of the week.

Discussion:

Key Message 1 Description:

Light rain will continue to track through the Kennebec Valley and central New Hampshire this evening, becoming more showery.

The cold front will progress southward tonight with showers weakening as they reach the coast. Much of tonight will be dry with patchy fog possible, especially in valley locations and areas that see some rainfall. Lows tonight with range from the 40s north to 50s south.

High pressure will be in control Monday for fair weather and temperatures ranging from the 70s north to low 80s south. Light and variable winds will turn onshore along the coast.

Key Message 2 Description:

A ridge builds into the Great Lakes through the week, while New England looks to remain on the eastern periphery of the ridge. The ridge continues to amplify across Hudson Bay by late in the week, then folds over across northern Quebec. While remaining on the edge of the ridge midweek, New England looks to become enveloped in a deepening trough across Atlantic Canada by late in the week. This brings a cooler and unsettled pattern, that may extend into Labor Day weekend as well.

The first system arrives in New England late Monday night and Tuesday. Low pressure tracks through southern Canada, while a warm front looks likely to stall across New England and serve to focus rounds of showers and storms. The first round looks to miss most of the area to the south and west, leaving southwest New Hampshire the most likely spot to see showers and storms with the first round.

The front drifts north a bit into central New England by late Wednesday and Thursday. A fresh wave of moisture drifts northward into the area at the same time, while the low pressure center makes its closest pass through southern Quebec. This brings the best chance for the most widespread showers and storms to much of the area.