A cold front moved through the area today, removing the warm and very humid air mass that persisted over the last few days, while also triggering heavy thunderstorms, flash flooding and hail in eastern Long Island. Behind this cold front, drier and cooler conditions along with more sunshine will return for Wednesday and Thursday, with a quick yet strong trough bringing a much cooler ending to the week as lows fall into the 40s to low 50s away from NYC and the coast.
<< September 1 | September 2 | September 3 >>
Monday, September 2 Observations:
A pre-frontal trough moved through the region, along with several shortwaves moving through, bringing an active day of storms to the region, ranging from moderate to locally heavy storms in the area, severe storms in western NY state, and a cold heavy rain in Maine. Early morning scattered storms were observed north of NYC, with a more widespread round of storms affecting the immediate NYC area and northern NJ between 12-3 PM, mostly dissipating by the time it got to Long Island. Despite this, a strong thunderstorm stalled over northern Queens for over an hour, resulting in heavy rainfall with over 1-2 inches of rain observed. Temperatures were slightly cooler due to the cloud cover and rain, peaking in the upper 70s to low 80s, but conditions remained very humid with dew points in the low 70s, reaching the mid 70s for some. The highest temperature was 84 degrees in Newark, NJ, and the coolest high was 76 degrees in Montauk, NY and New London, CT.
Tonight – Friday: Cooler, Drier, Less Humid
The highlight for the next few days remains the cooler and drier air mass moving into the region, with temperatures cooling back down to near average along with more sunshine and less humidity. Mostly sunny skies are expected for Wednesday with highs peaking in the upper 70s to low 80s across the area with a west wind at 5-10 mph. A strong upper level low will dive southeast through Canada, briefly entering the region on Thursday into Friday, bringing much cooler temperatures to end the week as 850mb temperatures fall to near 4-6C in the area and as low as -2C towards northern parts of the region.
Relatively strong cold air advection is expected on Thursday with mostly sunny skies and a north wind at 8-14 mph, with highs expected to peak in the low to mid 70s inland and mid to upper 70s for the rest of the area. The coolest temperatures are expected on Thursday night, with mostly clear skies, decreasing winds, and lows falling into the low 40s inland, mid 40s to low 50s in the north/west suburbs, southern CT and interior Long Island, and the low to mid 50s in NYC and the immediate coast. Mainly sunny skies are expected on Friday with highs in the upper 60s to low 70s inland and the low to mid 70s for the rest of the area.