We went through a tremendously wet period of weather to begin 2018. Through the first 4 months of the year, just about all of Cape Cod had seen well in excess of 20 inches of precipitation and parts of the area had picked up nearly 30 inches of rain and snow (liquid equivalent)! However, as is typically the case with weather and climate, things have a tendency to balance out and we’ve since entered a much drier stretch.
Over the last 30 days we’ve only picked up 2 to 3 inches of rain and most of that fell in June. Thus far in July, most of Cape Cod has picked up well under an inch of rain. Hyannis, for example, has recorded just .20″ inches of rainfall this month. Chatham has picked up only seven hundredths of an inch! Although ground water levels are still very high from the spring rains, it’s not surprising, therefore, to see all of the brown, dusty, dried out lawns around the area.
With that all said, we do have an opportunity for some wet weather this week.
A frontal zone will sag into the Northeast on Tuesday and cut across New England from west to east Tuesday afternoon and night. Along and ahead of this boundary, numerous showers and thunderstorms are expected to fire off Tuesday afternoon and there is likely to be some embedded areas of heavy rainfall throughout the Northeast and New England.
Unfortunately for us, most of this diurnally-aided activity will be focused to our west thanks to better daytime heating. As these strong storms press south and eastward they will tend to weaken and the odds of widespread beneficial rain will decrease.
However, a weak wave of low pressure will attempt to develop along the front as it slides through our area Tuesday night and first thing Wednesday morning – bringing a second opportunity for rain. While it’s certainly not a slam dunk that we’ll steal too much rainfall from this weather system, the follow-up wave could yield a period of downpours later Tuesday night or very early Wednesday morning before it slides out to sea.