With high pressure anchored over the Southeast coast this morning, a southwesterly wind at the lower and mid levels of the atmosphere is transporting a hot and humid air mass into the northern Mid Atlantic this morning through tomorrow afternoon. Temperatures are already in the mid to upper 70’s this morning and are expected to rise into the lower 90’s along the immediate coast and mid to upper 90’s, possibly 100 degrees over the rest of the New York City and Philadelphia metropolitan area. In addition to the potentially record breaking high temperatures this afternoon, high levels of humidity with dew points in the 60’s to lower 70’s will lead to a heat index of 95 to 100 degrees along the coast to the lower to mid 100’s throughout the region of the region. Temperatures tonight will only fall into the upper 60’s to mid 70’s for lows before rebounding once again into the 90’s for highs tomorrow afternoon with similar if not higher heat index values.
These weather conditions this afternoon and tomorrow afternoon can lead to significant health problems due to heat stroke and can put major stress on the elderly and young children. I would strongly suggest drinking plenty of water, go in doors in a cooler location if possible, and wear light clothes. If you feel light headed, get into a cooler location as soon as possible.
The heat wave will not last long, thankfully, as a weakening cold front will move through the New York City and Philadelphia metropolitan tomorrow night. This cold front will produce scattered showers and strong to severe thunderstorms tomorrow evening into early Friday morning. These thunderstorms will be capable of heavy downpours, wind gusts over 50 mph, large hail, frequent lightning, and potentially an isolated tornado. Temperatures behind this cold front will be cooler with high temperatures falling back into the 80’s for highs, but the most significant chance by Friday afternoon will be the decline in humidity in the atmosphere.
The cold front will stall just to the south of the Philadelphia metropolitan area by Friday morning and remain meandering over the northern Mid Atlantic from Friday evening through Monday leading to variable cloud cover and a risk for widely scattered showers each day through this weekend. Temperatures will remain cooler in the 70’s to lower 80’s for highs and lows in the 50’s to lower 60’s with low humidity. The weekend won’t be a wash out, but the threat of showers will exist.
High pressure will rebuild into the region for Tuesday and Wednesday with temperatures once again on the rise with lows in the 60’s and highs in the 80’s with humidity on the way up as well.
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