Weather: The weather is turning rainy and cold this week

ITHACA, NY – The start of the week will be unsettled as a second storm moves in shortly after the rainmaker departs this weekend. As high pressure returns in the second half of the week, it will be a bit chilly, with highs in the 60s and lows in the 70s. The flip side is that this elevation will keep the effects of Hurricane Lee away from Ithaca, and provide a pleasant end to the work week.

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The frontal boundary has stalled across eastern New York State and much of New England is creating widespread cloud cover, as well as scattered showers and thunderstorms across the upstate Sunday afternoon. These showers and storms will continue periodically through the early overnight hours, with new rainfall amounts generally in the 0.1″-0.25″ range. With all this moisture in the area, temperatures will only cool slightly tonight, from highs in the low 70s today, to the low 60s overnight, as rain and storms end after midnight.

As the front rises towards the northeast on Monday, the sky will gradually clear as the day progresses, with light northwesterly winds blowing behind the front. Temperatures will drop slightly, with highs in the mid-seventies, and the sky will become dry and partly cloudy later in the day. Monday night, skies will be partly cloudy, with lows in the upper 50s.

A second low-pressure storm system will pass north of Tompkins County on Tuesday, and a subsequent cold front will move into the area late in the day, around sunset. Before the depression, in the warm sector of its counterclockwise rotation, light southern winds will blow, which will raise temperatures to about 80, with rain and storms beginning to develop in the afternoon hours. More stable if light rain falls Tuesday night as the front slowly crosses the area, with 0.1-0.25 degrees expected and lows in the low 60s.

Rain begins to taper off as the front passes at sunrise, but its movement is slow with some showers and thunderstorms continuing around the Ithaca area during the daytime hours Wednesday. It will be cool and mostly cloudy, with highs only around 70 degrees. Wednesday night will see precipitation taper off around midnight as the low continues to move away, with partly cloudy skies and cool overnight lows around 50 degrees.

High pressure is building from the Great Lakes on Thursday. It will be unseasonably cool and partly sunny, with highs in the mid 60s. Thursday night will see some clouds and lows in the upper 40s. Bring a jacket if you’re going to be out late.

Starting Friday, high pressure is moving overhead, slowing northwesterly winds and allowing temperatures to rise. It will be sunny and around 70 degrees. This height will also prevent Hurricane Lee from severely impacting the mid-Atlantic coast, although questions remain about the location and severity of impacts on New England and Atlantic Canada. Friday night skies will be partly cloudy with lows around 50.

Heading into next weekend, the current weather is expected to be dry and mild to slightly cold through the weekend. Highs will be in the low 70s on Saturday and mid 70s on Sunday, with sunny to partly cloudy skies. Overnight lows will be in the mid 50s.

Graphics provided by NOAA’s Climate Prediction Center.

Expanded forecasts

Given the second half of September and the beginning of astronomical fall, the large-scale setting calls for a series of pronounced jet streams over the Mountain West, and a trough over the Appalachians. Part of this is likely a reflection of Hurricane Lee as it heads north across the Atlantic next weekend; This will bring warm, moist air closer to the storm and its path as it speeds poleward, but its widespread counterclockwise flow will help pull cold Canadian air to the west and strengthen the weak depth of the jet stream. For Tompkins County, it looks like it will be slightly warmer than normal, with precipitation a little closer to normal.

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