Metro Boston, North Shore and Metro West: High pressure allowed for a nice weekend overall but the system has pushed offshore with a south to southwest air flow developing. This air flow will push tropical air into the region early in the week. Sunday afternoon saw high temperatures climb well into the 80s while dew points inched through the 60s making it a bit humid. The string of pleasant weather comes to an end early this week with warm and very humid conditions into the middle of the week. There will be lots of cloudiness, showers and thunderstorms and the risk for severe weather, especially on Tuesday.
A cold front positioned across upstate New York extends to low pressure in southern Michigan Monday morning. The front will stall as disturbances ride along the front north of our region. Meanwhile, tropical air will continue to spill into the area as the south to southwest flow continues. Dew points are expected to reach around 70 degrees, perhaps the low 70s for some, making it very uncomfortable for outdoor work or any activity for that matter. Showers and thunderstorms may break out as early as midday Monday but the better chance for this activity is for later in the day, overnight Monday night and lasting through Tuesday night. Some storms may become strong to severe with heavy downpours, frequent lightning and gusty winds. There is also a threat for localized flash flooding in those locations that are hit with the torrential downpours.
High temperatures on Monday in the low 80s. Skies will average mainly cloudy but a few peeks of sun is possible with that threat for showers and storms lasting through the overnight. Lows at night will only dip to the low 70s, perhaps near 75 in Boston as it will be a stuffy, warm and uncomfortable night.
Tuesday, along with the threat for showers and storms it remains warm and humid. Highs in the low 80s. Lots of clouds once again but with a peek of sun possible.
More of the same for Tuesday night, lows near 70.
Then on Wednesday we see the cold front finally make a push toward eastern Massachusetts. It will be slow to traverse the area but should be offshore by Wednesday night. Showers with the possibility of a few storms linger through the day and evening. Although still humid the mercury will remain in the upper 70s to near 80 degrees for highs on Wednesday, falling back into the mid to upper 60s at night.
The last two days of the work week become drier and quiet. Although some early clouds may linger along the coastal plain Thursday morning the general trend will be for clearing skies with a mix of clouds and sun both Thursday and Friday. A less humid air mass expands over the region as high pressure works its way toward southern New England. Highs both days from the mid 70s to low 80s. Overnight lows very comfortable in the low 60s.
North Shore beach forecast:
Monday: Mainly cloudy with a spot peek of sun possible. Showers and thunderstorms may break out in the afternoon. High temperatures in the upper 70s. South to southwest winds 5 to 15 mph. UV Index high, water temperatures in the low to mid 60s and high tide during the early afternoon hours.
Keep an eye to the sky and if you hear thunder in the distance begin to prepare to take cover. Do not wait until the storm gets closer because you may not have enough time to get to shelter.