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Heatwave Length Depends On Backdoor Cold Front

Heatwave Length Depends On Backdoor Cold Front

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Heatwave Length Depends On Backdoor Cold Front

The well telegraphed heatwave remains on course for early next week however there are some complications that have developed. Specifically it has to do with a backdoor cold front dropping down from upstate New York. We call them backdoor cold fronts because rather than come in from the west, they come in from the north or northeast which is the reverse of the normal pattern. They usually impact only the bottom of the atmosphere as they tend to be shallow cool air masses with a marine influence. This is especially evident in the spring as the ocean water remains cold relative to the heating land temperature. We have certainly seen our fair share of ocean air this spring.

coastal low

Sunday will be the first day of 90 degree temperatures for some areas but not all. Monday will I believe be the hottest day of this stretch with highs of 90 to 95.

heatwave

Tuesday becomes the first day in question with the timing of the backdoor front. The GFS has it sitting right across NYC & Long Island  and across Central New Jersey Tuesday afternoon. If this is right, areas to the north will might get to 90 early in the day before dropping off a bit. South of the front though in Central & Southern New Jersey, Souheastern Pennsylvania southward into Maryland, it should make low to mid 90s. Then there is the question of scattered thunderstorms as well. However bear in mind the European and the late afternoon GFS are a bit slower than the GFS was earlier which means Tuesday will be hot for much of the area before the backdoor front slips south.

heatwave

Either way the front does slip south and you can see the temperature changes for Wednesday with highs in the cooler upper 70s to lower 80s across much of the area. 90s get pushed southward into Virginia and North Carolina. After that a stronger front comes in from the west at the end of next week with the chance for downpours and thunderstorms. In sum, this heatwave will be short and only 3 days. By the old 5 day standard for heataves, this one would not even register.

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