The hottest day of the summer so far
For those patiently waiting for summertime heat, you've been rewarded. The heat index spiked into the 90s on Wednesday and will do so again on Thursday. Caribou will take a run at a record high (91° in 1976) as will Bangor (91° in 2019), Millinocket (91° in 2010), and perhaps Houlton (93° in 1976).
A bit of a sea breeze is expected to bring relief to the shorelines but may not venture in too far with high pressure to the west. If you are headed to the ocean beach, do so early. High tide will around 2 PM this afternoon, crowding space there.
Children, the elderly, and those with chronic illness are especially vulnerable to heat exposure.
NEVER leave anyone (or pets) alone in a locked car. Monitor people exercising or playing sports, ensuring frequent breaks. Bring water to outdoor activities with others to keep everyone hydrated. Learn the signs of heat-related illnesses at weather.gov/safety/heat-illness
Thursday 12 PM to Midnight Friday - There could be a few pop-up showers with perhaps an isolated storm along the Quebec border in the afternoon. I am not expecting too much in the way of a severe threat, but with the dew points in the upper-60s to low 70s, that idea can't be completely dismissed. Torrential rain with flash flood potential is the main concern as these are likely to be slow moving dumpers. After sunset, showers and storms fizzle out as the atmosphere cools. Expect areas of fog in spots, which could be locally dense.
Showers and storms for interior areas Friday
Friday 12 PM to Saturday 2 AM - Friday does not appear to be as hot as clouds increase as a cold front approaches from the west. With high pressure to the east and low pressure attached to the front to the west, it will get the sea breeze going stronger which will bring relief from the heat further inland, especially MidCoast and DownEast areas on up into Bangor. Showers with the risk of a strong to severe storm is expected once again for the mountains on up into The County. Heavy rain, gusty wind and small hail is possible with stronger storms.
Slow moving frontal boundary over the weekend
Saturday 2 AM to Monday 8 PM - The atmospheric set up is for a strong ridge of high pressure south of Greenland and a strong upper low cutting across central Canada. Model ideas are varied in how the two are going to interact. I do expect showers and storms around over the weekend, with the better chance for activity over the interior. Cooler temperatures will be on the way with forecast highs in the 70s, with the juicy dew points just a few degrees below that. Shower activity is expected to increase Sunday afternoon into early Monday as the front passes through. Low pressure may develop around the Carolinas early on Tuesday and move northeast, which could bring another round of heavy rain to area. Stay tuned for updates on that
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