Changes in air are almost always accompanied by wind and when the changes are abrupt enough, accompanied by rain or snow. This weekend, New England will see a couple changes in air that will be marked by wind, but not a lot of rainfall, and the wind is sure to make for changing, challenging conditions for rowers and their coxswains (the folks who steer the boats) at the Head of the Charles Regatta. The first change has already been underway with unseasonably cold Friday low temperatures in the 20s and 30s rebounding over 30 degrees to afternoon highs that actually are just about perfectly normal for this time of the year. That change of air comes with an increasing southwest wind that will continue as a breeze overnight Friday night, keeping temperatures in the 40s and 50s for a much milder night, leading into a mild Saturday. One disturbance aloft will trigger a few isolated morning showers Saturday, then the focus for showers splits to Vermont and perhaps scrapes Cape Cod during the midday, while most communities in between see clouds mixed with some sun and highs reaching the middle 60s. Late Saturday afternoon to evening, the cold front prompting Vermont rain showers will drop south, spreading scattered showers into Central and Southern New England and opening the door to colder air to spill across New England Saturday night and Sunday, when daytime highs won’t exceed 50 degrees for most and a stiff northwest wind gusting to 40 mph will hold wind chill values in the upper 30s. Although mountain snow showers are possible Sunday, most of us will find dry air that will hold on through Monday, before the next chance of showers arrives, particularly the farther north one is. We’re hopeful showers that may be around Tuesday would be gone by the start of the first World Series game at Fenway Park, and Wednesday’s game looks dry right now with both game temperatures likely to be in the 40s in our exclusive Early Warning Weather 10-day forecast.