Heat and Humidity Returns

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~Monday and Tuesday will be some of the hottest days so far this year when factoring in the high dew points. We already achieved the 90+ degree mark 3 times back in May. It's been nearly a month since the last 90 degree day given the cool, wet pattern we've been in. High pressure located off the east coast will create a southwesterly return flow streaming heat and humidity northward from the Gulf and southeastern states into Tuesday. 


~Our hottest days so far this year were 91 and 93 degrees back on May 2nd and 3rd, which were records for the date. That came with low humidity and mostly sunny skies. It can be easier to get to the 90+ degree mark in late April/early May given that there are no leaves on the trees, and it is typically much less humid. The drier conditions promote hotter temperatures. Add water vapor to the equation and it limits how hot we can get. But now that we are into mid-June, the mid and upper levels have warmed, much warmer than what they would be in April and May given we are later into the spring/early summer season. While humid days become more common, the air-masses are warmer and therefore the 90s become more frequent as we head into summer. If today's dew points were not in the upper 60s/low 70s, and in the low 50s like it was on those early May days this year, upper 90s would be easily achievable. But thankfully that is not the case! Mostly sunny skies today with bubbling cumulus clouds this afternoon and highs in the low to mid 90s. Cooler at the beaches. Heat index near 100. Make sure you wear plenty of sunscreen! 


~A cold front will approach from the north Tuesday but will not come through until Tuesday afternoon and evening. Temperatures will rise into the upper 80s, and possibly the lower 90s if the frontal passage is delayed and sunshine is dominant. Skies will range from partly to mostly cloudy. With the hot and humid air mass, scattered showers and thunderstorms will develop in the afternoon and evening. Some storms may produce gusty winds and small hail. The main threat will be lightning and heavy rain. 


~After Tuesday's frontal passage, Wednesday will be cooler and less humid with high pressure moving in from the northwest. While less humid than Monday and Tuesday, it will still be noticeable. Highs in the low to mid 80s. Skies will range from partly to mostly cloudy. A chance of showers exists later in the afternoon and evening with a weak disturbance approaching from the west. 


~Temperatures will remain seasonably warm and less humid Thursday into Friday with highs in the upper 70s to lower 80s as high pressure moves in from Canada. Another warming trend into the upper 80s and 90s may be the case late weekend into next week as ridging in the jet stream expands eastward from the Great Lakes.