A strong cold front moved through the area last night, with a much cooler air mass returning into the region expected to bring temperatures back to below average levels for the first half of the week with frost possible for interior locations on Monday night. A gradual warm up will take place for the rest of the week into next weekend, with mostly sunny skies and generally seasonable temperatures.
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Saturday, September 21 Observations:
A strong cold front moved through the region, with a line of heavy rain and storms slowly approaching the area throughout the day. Partly cloudy skies were observed for most locations, with a localized heavy shower affecting Nassau and Fairfield counties in the early afternoon with 1/3 inch of rain. Cloud cover increased again in the evening as the line of storms approached, with heavy rain starting west of NYC around 9-10 PM, and east of NYC between 11 PM and 2 AM. Rain continued to fall through the early-mid overnight hours, with rain totals of at least 1/2 to 1 inch across most of the area. The highest temperature was 80 degrees in Teterboro and Newark, NJ, and the coolest high temperature was 72 degrees in Danbury, CT.
Today – Wednesday: Colder Temps Return, Frost Possible Inland
The cold front that moved through last night is currently near Maine, and is slowly moving to the east. The front will become negatively tilted, with a cutoff low pressure forming near Nova Scotia and persisting through Wednesday. This will keep the region under a trough with a northwest flow, bringing another round of chilly temperatures through Tuesday before slowly starting to moderate.
High temperatures are expected to reach the upper 60s inland and the low-mid 70s across the rest of the area today along with partly sunny skies and a breezy NW wind at 10-15 mph, gusting up to 20-30 mph at times. Mostly clear skies are expected tonight with lows in the 40s for most, with NYC near or slightly under 50 degrees. Monday will be the coolest day of the week, with sunny skies and highs peaking in the mid 60s across most of the area, likely struggling to rise above 65 degrees in NYC and northeast NJ.
The coolest temperatures are expected on Monday night, with clear skies and lows falling into the mid-upper 30s inland, upper 30s-low 40s in the high elevations of CT and the Long Island Pine Barrens, low-mid 40s in the north/west suburbs of NYC, mid-upper 40s in Long Island and coastal CT, and upper 40s-low 50s in NYC and the immediate coast. Temperatures will then begin to slowly rise, with sunny skies again on Tuesday with highs in the upper 60s to low 70s. An increase in cloud cover is expected on Wednesday as a shortwave trough moves through but without producing any precipitation, with highs in the low 70s for most of the area.