By Justin Drabick

PHILADELPHIA (CBS) – A shift in the weather pattern allowing the jet stream to move north has allowed for a very warm air mass to move into the Delaware Valley this week.

Highs last Saturday were well-below average in the low 50s, but quickly warmed up to the upper 70s on Monday. Then the temps really soared on Tuesday reaching a high of 84, tying in the record.

The warmth will peak today and as of 2pm the temperature at Philadelphia Airport was 88, breaking the old record of 87 degrees. Most other locations around the region have already tied or broke their records as of early afternoon.

The average high this time of year is 62 but random 80 degree days start to become more common.

More typical April weather will begin to return to the Delaware Valley starting tomorrow.

A backdoor cold front will slide through from the north on Thursday allowing for a cooler easterly flow to return.

Depending on your location highs on Thursday will range from the low 60s in the Lehigh Valley to well into the 70s in Delaware.

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