Another strong cool air mass is present over the region, with temperatures today expected to be at least 10 degrees below average with frost possible for interior areas tonight. A slow warm up will take place this week, but with temperatures likely only warming up to seasonable to slightly above average at most as highs stay in the low to mid 70s through next Monday (image credit: PSU e-Wall).
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Sunday, September 22 Observations:
Behind the cold front on Saturday night, a much cooler air mass returned into the region, with partly sunny skies and a breezy NW wind at 10-15 mph, gusting up to 20-30 mph at times. High temperatures were cooler as well, peaking in the mid 60s inland (NW NJ, interior SE NY), upper 60s in the north/west suburbs of NYC, and the low 70s from NYC and further east and into southern CT. The highest temperature was 73 degrees in Bridgeport, CT and New London, CT, and the coolest high temperature was 62 degrees in Port Jervis, NY.
This Week: Chilly Temperatures Continue
The coolest air mass so far this fall is located over the region, with 850mb temperatures near 2-4C over the area. Chilly temperatures were observed this morning, falling into the 40s for most of the area with 39 degrees in Sussex, NJ; Central Park reached 50 degrees for the second time this month. Sunny skies are expected today with a NW wind at 6-12 mph and highs in the mid 60s, with the 6z run of the 4k NAM shown to the left depicting today’s modeled high temperatures (image credit: PSU e-Wall). Clear skies and lighter winds are expected tonight, with lows in the mid-upper 30s inland, upper 30s-low 40s in interior CT and the Long Island Pine Barrens, low-mid 40s in the north/west suburbs of NYC and coastal CT, mid-upper 40s in Long Island away from the coast, and upper 40s-low 50s in NYC. Areas of frost are possible towards NW NJ, interior SE NY and possibly the Pine Barrens.
A slight moderation in temperatures will occur on Tuesday and Wednesday, with highs rising into the low 70s across the area. A shortwave trough will slide underneath the ridging to the west, then diving southeast while staying south of the area, which will keep the cool air mass at the western end of a cutoff low in Atlantic Canada stuck over the region through the late week, and as a result, temperatures have been slightly lowered in the 7-day outlook for the rest of this week. Temperatures on Thursday are expected to reach the upper 60s to low 70s in eastern areas and low to mid 70s from NYC and further north/west, with slightly cooler temperatures on Friday in the upper 60s-low 70s east of NYC and the low 70s from NYC and further north/west.