Summer 2017: Warm…But Wet! 5/22/17
Hello! I hope everyone enjoyed the weekend! After a very unusual May heat wave, temperatures cooled back to seasonable levels this past weekend. In fact, some said it even felt a bit chilly Saturday night!
I was very pleased that showers and thunderstorms stayed away from the region for proms and graduations this past weekend! Although there was a strong thunderstorm late Friday evening, it didn’t interfere with any outdoor activities.
I had high confidence of a day or two of hot weather coming. What I was very surprised at, was that a full fledged heat wave engulfed the region. It started on Wednesday, with temperatures certainly becoming much hotter than anticipated, when highs reached 92 degrees!
Thursday was supposed to be the hot day, and boy was it ever! Temperatures soared to a record high of 95 degrees in Boston! Some places approached the hottest temperatures ever recorded in May!
The heat lingered on Friday, with Boston reaching 90 degrees once again! With three consecutive days reaching 90, this was an official heat wave!
Friends and family were asking me if this was unusual. The short answer to this question is, yes! On average, we typically see only one day of 90 degree heat in May.
However, an official heat wave during May is extremely rare! Since 1972, this was only the third heat wave ever recorded in Boston. Even more impressive, this was also the second earliest heat wave ever recorded in the city!
If you havn’t noticed, the pattern has been extreme! Just a few days earlier, many areas of northern New England had snow falling on Mother’s Day! In fact, Mt. Washington got clobbered, with a whopping 33″ of snow! Many other areas in Vermont and New Hampshire also received snow that day.
I like to do research, and look at other years in the past, that closely compares to this year. This is known as analog research. The year that most closely resembled this year, was May, 1977!
In that year, we also had a memorable Mother’s Day snowstorm. Much like this year, we also had a burst of extremely hot temperatures in the mid 90’s shortly after that storm!
With the early season heat wave, you may think a very hot summer is coming. It’s only natural to think this. It’s similar to if we got a a snowstorm in November. Many would think that a brutal winter was ahead. However, this is not always the case!
Unlike last year, the patterns this year are more volatile, and will feature more changeable conditions. Last year, I was very confident in a hotter than average summer. The parameters were pointing towards heat! And indeed the heat came.
In an average summer, Boston averages about 14 days of 90 degree weather. Last year, we managed to rack up 22 days! This was despite a cool start to the season.
As it has been the past couple summers, the heat arrived later in July and especially in August. We’ve even had unusually hot weather lingering into September the past couple years!
In summer 2015, we had a building record El Nino. This flooded the country with unusually warm weather beginning in late July, and extended all the way until the end of the year!
Last summer, we had a strengthening La Nina. Although the forces are different, the end result was a much warmer than normal late summer and fall season. Although not as warm as the year before.
This summer, we have neutral conditions in the Pacific, with tendancy leaning towards weak El Nino. These type of summers bring us highly variable conditions.
I am expexting our hottest weather this summer to be in June and July, with a noticeable cool down as we head into August and September.
Long range computer models are hinting at a cooler than normal outlook, as well as above average rainfall in the middle of the country this summer.
With a trough (cool & rainy), set up in the middle of the country, this leaves the east coast susceptible to a ridge of high pressure (warm & dry). However, signals are weak over New England. Meaning it could go either way here.
With ocean temperatures continuing to be warmer than normal off the east coast, I’m going to average the two extremes together. Therefore, I’m expecting a warm summer this year, just not as hot as last year. I’m also expecting more rain this summer! I’m expecting is brief bursts of hot weather, puncuated by cooler air masses.
With the clash of air masses, I’m expecting many more showers and thunderstorms than last summer. This also means a much greener summer around here than last year! This should make gardners and farmers happy!
It’s difficult to say when the inclement weather will occur. Just be prepared to plan accordingly this summer. It will not be as stable as last summer’s tranquil patterns. Please check the weekly forecast to make plans for outdoor activities!
I do not want to discourage anyone! We will have stretches of beautiful summer weather! Remember when I said it’s all about timing! If the rainy weather occurs during the weekdays, and the weekends are nice, this will make many happy!
So just how hot can we expect it to be? I like to base how hot our summer is, by how many 90 degree days we receive. Amazingly, we already had 3 of them…and the summer solstice is still nearly a month away!
After reviewing as much data as I could, I’m expecting a slightly warmer than normal summer this year in Boston. But somewhat cooler than last year.
This means, you can expect between 14 and 17 days that feature 90 degree + temperatures this year. We’ve already had three of them! Past couple years, summer has gotten off to a slow start. I’m expecting the bulk of the hot weather to occur in June and July, and cool off in August this year.
What could go wrong? Unlike previous years, I’m concerned this could tilt towards a cooler summer than presently forecasted. I would say there’s a 60% chance of this happening.
The atmosphere seems to be fighting between warm and cool right now. After nearly two years of above average temperatures and dry weather in Boston, the pattern seems to be slowly evolving to a cooler one.
The change began in March, but has been fluctuating since. I’m still expecting a large scale pattern change to cooler and stormier weather. But this should hold off until autumn, as I see it now. Until then, we should continue with surges of heat, puncuated by cooler periods.
With that being said, there’s also a 40% chance that the summer could be a bit hotter than expected. It’s really difficult to tell until the summer pattern establishes itself. I may have a quick update to this summer forecast around the time of the summer solstice.
Now for your hiking and camping forecast. Expect unsettled weather, with areas of rain later tonight and early tomorrow. Also Thursday night into Friday, then again on Sunday possibly into early Monday.
Not ideal, but there will be some dry weather in between. It will also be much cooler than last week. Plan your trips accordingly.
Now for your regional outdoor activity forecast. I will rate this week a 4 out of 10. Overlall, it will be unsettled, but not entirely a washout.
Expect cloudy weather for the rest of today. A bit later, showers and areas of rain will begin to develop. It will be on the cool side, with highs in mid to upper 50’s.
Look for more wet weather tonight into early tomorrow morning. It will be cool and damp, with lows near 50. Later tomorrow, we may see some bightening of the skies, with highs near 70 inland, but only around 60 along the coast.
Another wave of low pressure will pass south of the region tomorrow night. If this come close enough, it may spread rain back into at least the south coast, and possibly up to Boston.
This should clear out early Wednesday. If things go according to plan, the sun may come out, and it may turn out to be quite a nice afternoon. It will be on the cool side, with highs mainly in the 60’s.
Thursday may start dry, but clouds will be on the increase during the day. With onshore winds, it will be on the cool side, with highs only in the upper 50’s.
Yet another storm will be approaching Thursday night into Friday. This looks more like a winter type scenerio than spring. A low pressure system will be developing south of New England, spreading rainy and damp weather through much of Friday.
It will be on the cold side, with highs only in the 50’s. If we’re lucky, the rain may stop in time for proms Friday evening. Very iffy about that, at this point. Sorry, Olivia! Have fun just the same!
At this point, the holiday weekend looks shaky at best. Saturday may start damp, only to brighten up in the afternoon. Another storm may approach on Sunday, bringing more showers. This storm may linger into early Monday. Temperatures look cool, with highs mainly in the 60’s.
Whether it dries out or not in time for Memorial Day is still questionable. I don’t believe there will be much beach weather regardless this weekend. If it’s not raining, it will be just too chilly to be on the beach. I hope I’m wrong about that!
Well, that’s about it for now! In next week’s blog, I will hopefully have a much brighter Memorial Day forecast for everyone! I will be reviewing the month of May, and have a preview for June.
I will also begin my weekly beach and boating forecast! In the meantime, summer is coming this year, but keep the sweaters close by just in case!
Thanks for reading,
Pete