First day of summer, longest day of the year in Lehigh Valley

Ella"s First Day of Summer School

ALLENTOWN - Monday will bethe longest day of the year and the first day of summer. It"s certainly going to feel like it in the Lehigh Valley, with temperatures expected to spike into the low to mid 90s.

The National Weather Service says the surge of warmth that really began building on Father"s Day will ease quickly, but not before temperatures surge into the 90s once again. Unfortunately, the conditions that made for a comfortable Sundaywill not be duplicated. Instead, warm and more humid air has built over the area and will only continue to climb.

The weather service says an advancing cool front is expected to cool things down, with partial cloudiness andscattered showers and thunderstorms overnight tonight.

Tuesday is expected to bring a mix of clouds and sun. The weather service says a stray shower or thunderstorm is possible as highs climb into the upper 80s.

Meteorologists say Wednesday is expected to be warm, but humidity levels will become more comfortable. Highs should be in the mid to upper 80s before thunderstorms really cool things off on Thursday.

Is the warm weather a sign of things to come? The Climate Prediction Center recently released its three-month outlook of temperature probability, and the Lehigh Valley is expected to trend above-average over the next three months.

Here"s theextended forecastfrom the National Weather Service:

Today:Sunny, with a high near 93. Calm wind becoming southwest 5 to 9 mph in the afternoon.

Tonight:A chance of showers and thunderstorms, mainly after 11pm. Partly cloudy, with a low around 66. Southwest wind 6 to 8 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday:A slight chance of showers and thunderstorms after noon. Sunny, with a high near 85. Northwest wind 7 to 10 mph. Chance of precipitation is 20%.

Tuesday Night:A slight chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 56. Light northwest wind. Chance of precipitation is 20%.

Wednesday:Sunny, with a high near 83. West wind 6 to 14 mph.

Wednesday Night:A chance of showers after 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Thursday:A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.

Thursday Night:A chance of showers before midnight. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.

Friday:Mostly sunny, with a high near 84.

Friday Night:Partly cloudy, with a low around 59.

Source: http://www.mcall.com/news/weather/mc-first-day-of-summer-longest-day-of-the-year-in-lehigh-valley-20160620-story.html