The showers and thunderstorms that were forecast to arrive late in the afternoon and evening yesterday did not arrive until after 9 pm last night. These storms fired up in New York State late in the afternoon, were into the Pioneer Valley by evening and tracked eastward toward the coastal plain. We had quite a light show last night with some very heavy downpours and plenty of cloud to ground lightning. This activity pushed offshore by the early morning hours and we woke to a sunny and mild start to our Thursday morning.
As advertised the heat is on starting today. A stretch of 3 to 4 days of 90+ degree heat is likely, which would make it an official heat wave it we do break the 90 mark for three consecutive days. Along with the heat comes an increase in humidity, probably in the moderate to at times high range with the dew points running in the mid to upper 60s. Expect hot days and warm nights to continue into Sunday, with generally mostly clear to partly cloudy skies through this period.
There is a chance of a late day or evening shower or thunderstorm today, but they will be widely scattered and most of us remain dry. There remains a slight risk for a pop up shower or storm Friday and Saturday afternoon.
The high pressure ridge that will help to supply the hot and humid conditions will begin to move well offshore Sunday. A cold front will be approaching from the northwest. Therefore, an increase in clouds Sunday should be followed by a good chance of showers and thunderstorms at night. The front slides through and may stall for awhile early next week, which would support more showers and storms at least through Monday, as temperatures begin to cool down.
Five Day Outlook:
Thursday: Hot and increasingly humid. Mostly sunny skies, followed by a partly sunny afternoon. Slight chance of an isolated shower or thunderstorm late. High temperatures upper 80s to 90 along the coastal plain to the low 90s inland. West winds 5 to 15 mph.
Thursday night: Slight chance of an evening shower or thunderstorm, otherwise becoming mostly clear, warm and muggy. Areas of fog developing. Lows in the mid to upper 60s. Light west winds under 10 mph.
Friday through Saturday night: More heat and humidity. Skies range from mostly clear to partly cloudy. Slight risk of an isolated afternoon shower or thunderstorm. Highs upper 80s coast to low and some mid 90s interior. Nighttime lows mid to upper 60s to 70 degrees in Boston. Light winds prevail.
Sunday and Sunday night: Increasing clouds, followed by a good chance of showers and thunderstorms at night. Highs in the mid to upper 80s, with a few low 90s inland. Overnight lows in the low to mid 60s.
Monday: A chance of showers and thunderstorms. Cooler, highs in the upper 70s.