DAYS 1-5 (JUNE 13-17)
The larger scale pattern features continued domination by upper level low pressure over our region, with one moving from the Great Lakes across New England through early Thursday, exiting, and being replaced by a follow-up Friday into the start of the weekend. For our region this means continued unsettled weather. It doesn’t rain all the time, but there are daily opportunities for showers, some more substantial than others. While it doesn’t look it when you start the day today, this is an improvement day, but it will be somewhat subtle. We start our with a few lingering sprinkles but a thick overcast with areas of fog and drizzle, but a dry slot will be working in as surface low pressure lifts away from the region. This will help begin a clearing process, so the clouds will thin and break, but complete clearing is likely be prevented by a southeast to east air flow at the surface. Some partial clearing but patchy fog redevelopment is expected tonight, and clouds will become dominant again Wednesday with the approach of the next surface disturbance around the upper low. This one carries dynamics to produce more potent showers and thunderstorms in the afternoon and evening, with a low but present risk of severe thunderstorms occurring, so we’ll have to keep a close eye on the evolution of the weather tomorrow. This system exits by early Thursday as the upper low starts to pull out, so while the cold air lingering aloft still allows for a shower chance, the activity will be quite limited due to a drying process both at low and mid levels of the atmosphere. This doesn’t last long, as both the next upper and surface lows approach on Friday with an increased chance of showers and possible thunderstorms once again. The forecast for Saturday is a little lower confidence due to the difficulty in trying to forecast upper low departure to begin with, and the inconsistency of guidance designed to help the effort. Right now, I feel the upper low and a surface low will be close enough for a damp early Saturday followed by drying, but any solar heating helping scattered showers to pop up, so in summation, an unsettled day at best.
TODAY: Cloudy with a few showers and areas of drizzle and fog to start, then breaking clouds at times with only a slight chance of a brief shower. Highs 68-75. Dew point 60+ at least through midday may drop later. Wind SE 5-15 MPH.
TONIGHT: Variably cloudy. Areas of fog. Lows 55-62. Wind variable under 10 MPH,.
WEDNESDAY: Variably cloudy. Showers/thunderstorms likely later in the day. Any storms can be strong to locally severe. Highs 73-80. Wind SW 5-15 MPH.
WEDNESDAY NIGHT: Mostly cloudy with showers and thunderstorms in the evening, then breaking clouds but areas of fog. Lows 58-65. Wind W 5-15 MPH.
THURSDAY: Partly sunny. Isolated afternoon showers. Highs 72-79. Wind W 5-15 MPH.
THURSDAY NIGHT: Partly cloudy. Areas of fog. Lows 55-62. Wind W under 10 MPH.
FRIDAY: Variably cloudy. Scattered afternoon showers and thunderstorms. Highs 71-78. Wind W 5-15 MPH becoming variable.
FRIDAY NIGHT: Mostly cloudy. Chance of showers. Areas of fog and drizzle. Lows 55-62. Wind variable under 10 MPH.
SATURDAY: Cloudy start with areas of drizzle and fog, then breaking clouds and partial sun but also a chance of showers. Highs 68-75. Wind variable to N up to 10 MPH.
DAYS 6-10 (JUNE 18-22)
Upper level low pressure still close enough for a shower chance June 18. Evolution of pattern after that looks like a temporary Rex block with high pressure across eastern Canada into the New England region with a drying trend while low pressure gets pushed to the south – but must keep an eye on it as it won’t be far away. Despite drying, any warm up will be modest.
DAYS 11-15 (JUNE 23-27)
Not a high confidence forecast but signs of a rather quick Rex block break down and switch to a zonal flow pattern with a weak mean trough in the Great Lakes and Northeast. Resultant weather is a couple shower/t-storm chances and no major heat for the first days of summer.