Sept 18: Onshore Flow Detected!

Jonathan Carr
By Jonathan Carr September 18, 2015 14:02

Sept 18: Onshore Flow Detected!

Today and tomorrow should be the last few days of warmer temperatures and elevated humidity. On Sunday we’ll have a dry cold frontal passage which will provide some relief. Beyond that is interesting.

After the front moves through on Sunday, another area of high pressure will move in behind and settle over the New England region. Low pressure is already starting to develop over Florida and should track northwards to at least the Outer Banks of North Carolina by mid-next week. Remember, lows spin counter-clockwise (cyclonic) and highs spin clockwise (anti-cyclonic) in the northern hemisphere. Therefore, what I like to call the “pitching machine” should provide strong onshore flow off the ocean next week, regardless of whether the low rides all the way up the coast or not. In this image, the upper wheel represents the high. The lower wheel represents the low. And the ball represents cooler marine air mass and wind from the ocean that will be synoptically forced towards New Jersey:

rewder

Traditionally with onshore flow, we should expect slightly higher tides than normal due to winds pushing the ocean’s surface towards New Jersey and general mid-Atlantic coast. We also tend to have cloudy skies with even a few sprinkles. I think the onshore flow will develop early next week and provide these conditions heading into the weekend. Next weekend marks the point of uncertainty as to whether the low will bring rainfall or not. Regardless, the onshore flow will sustain as long as the low is to our S with high pressure blocking to our north. 

So basically, expect stiff E/NE winds off the ocean (gusting to 20-25mph), a mixed bag of sun, clouds and on-and-off rain, high temperatures in the 70s, and low temperatures in the 50s (40s for inland/elevations)…all starting Sunday PM and lasting most of next week into the weekend. I’ll be monitoring the coastal low’s track between now and then but regardless, the onshore flow forecast is fairly confident. Be safe! JC

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Jonathan Carr
By Jonathan Carr September 18, 2015 14:02

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