Sept 4, 2013: Chilly Temps Thursday Night, Friday

Forecast Highlights:

temp34Drier and less humid conditions returned into the area today behind a frontal passage, with temperatures cooling back down to near average. A stronger cold front will move through on Thursday, however, bringing a brief yet strong cool down into the area with temperatures below average, falling below 40 degrees inland. A brief warm up is expected for the weekend followed by another brief cool down for early next week, but with a warmer than average pattern likely towards mid-late September. (Image credit: PSU e-Wall)

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Tuesday, September 3 Observations:

9.3.13A cold front moved through the area through the morning hours, removing the warm and very humid air mass that was previously in place for Labor Day, with humidity gradually lowering along with partly sunny skies. Ahead of the cold front, a strong thunderstorm developed during the morning hours in south central Long Island, near Freeport, NY, which expanded and intensified as it moved into eastern Long Island and SE CT through the early afternoon, producing heavy rainfall and flash flooding, gusty winds, and multiple reports of hail. Totals were locally as high as 3-5 inches in the Hamptons area. High temperatures were cooler than those of Monday, peaking in the upper 70s to low 80s from NYC and north/west and the mid to upper 70s in Long Island and southern CT. The highest temperature was 84 degrees in Newark, NJ, and the coolest high temperature was 74 degres in Montauk, NY and New London, CT.



Tonight – Friday: Much Cooler ending To Week

The current upper level pattern consists of ridging in the western US and troughing towards the eastern US. A strong upper level low is currently near the Hudson Bay, moving southeast towards the Northeast US region. A strong cold front is currently located near southeastern Canada, which will move through the area on Thursday morning and early afternoon; while the front is strong, it is generally lacking in moisture as most of the significant moisture was pushed offshore by yesterday’s cold front, with only a few isolated showers possible towards southern CT and eastern LI early on Thursday. This front will bring in a much cooler air mass into the region for this time of the year, with 850mb temperatures falling to near 4-6C, which along with mainly clear skies will result in much cooler temperatures for the area.

Clearing skies are expected on Thursday behind the frontal passage, with a breezy NW wind at 8-15 mph and highs peaking in the low to mid 70s inland and the mid 70s for the rest of the area. The coolest temperatures are expected on Thursday night, with a Canadian high pressure moving into the area, bringing mostly clear skies, decreasing winds, and lows falling into the upper 30s to low 40s inland, mid to upper 40s in the north/west suburbs of NYC and southern CT, upper 40s in Long Island away from the coast, and low 50s in NYC and the coast. Sunny skies are expected on Friday with a light NW wind and highs peaking in the upper 60s inland and the low 70s for the rest of the area.



Weekend – Next Week: Fluctuating Temperature Trend

The cool air mass will exit the area on Friday night as the high pressure slides east of the area, setting up for southwesterly winds bringing warmer temperatures into the region, albeit only for a short period of time. Mostly sunny skies are expected on Saturday with highs in the mid to upper 70s across the area, with Sunday reaching the upper 70s to possibly low 80s near NYC. With the warmer air mass and increasing cloud cover, warmer overnight lows will briefly return on Saturday night, ranging from the upper 50s inland to the mid 60s near NYC. Another moisture starved cold front is expected to move through on Sunday, producing isolated to scattered showers and thunderstorms, mostly staying north of the area, followed by another quick cool down for Monday with lows likely falling back into the 40s inland and highs in the upper 60s to mid 70s likely at this time, with the temperatures subject to slight changes.

Behind the early week cool down, a shortwave trough will move through the northwest US, shifting the ridge axis into the eastern US with warmer temperatures and increasing humidity towards the middle of next week, likely back into the 80s for highs, with the next frontal passage likely towards late next week when the next chance of showers and possibly thunderstorms exists. Looking into the longer range pattern, a brief cool down is possible next weekend, towards 9/15, but given the overall large scale pattern with troughing in the NE Pacific/NW US and the Davis Strait, higher heights aloft are likely to return into the central and occasionally eastern US beyond at least 9/15, with a warmer than average pattern likely over the region and especially further west. More information will be posted on the longer range as details become clearer.

2 thoughts on “Sept 4, 2013: Chilly Temps Thursday Night, Friday

    • NYC Area Weather Post authorReply

      Considering that the cold front is currently over Long Island and will continue to push southeast, no showers are expected today, with the front having produced isolated showers in parts of CT earlier this morning. No rain potential is expected until Sunday.

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