September Discussion with WeatherTrends360

It’s time to harness the WeatherTrends360 proprietary weather algorithms to see how the rest of September 2018 should play out. But first lets break New Jersey into climatologically-similar regions. We have the higher elevations of NNJ/NWNJ, the interior coastal plain and Newark Basin (SWNJ through CNJ and into NENJ), and the coastal regions (most of SENJ coast – Sandy Hook down and around Cape May into Delaware Bay). I’ll be representing each climatological region with a 28-day graph from weathertrends360 data followed by a brief discussion.

Please keep in mind that these algorithms are documented with an 84% verification rate and are based on oceanic water cycles, time table series and very complex mathematics. The best takeaway from this data are general trends (cool vs warm, rainy vs dry, etc). I’m always hesitant to forecast specific surface conditions (rainfall amounts, snowfall amounts, winds, etc) beyond the 7 -day forecasting period. But temperature and precipitation trends are what WeatherTrends360 does best with their proprietary mathematical analysis derived from over 150 years of reactive pattern data. For this reason, let’s call this a long-range discussion of expectations rather than a locked-in long-range forecast.

Higher Elevations of NNJ/NWNJ

(Sussex, Warren, Hunterdon, Morris, N. Somerset, and N. Passaic) – Known for little to no Atlantic Ocean influence, colder-snowier winters, and drier conditions in general when compared to the coast. This rnown to get hot when high pressure sits overhead during the summer and bitterly cold during Arctic outbreaks in the winter. Elevation is a major influence that separates this micro-climate from the rest of New Jersey. This region extends into NE PA (Poconos) and parts of NY State (Catskills).

Higher Elevation Discussion: This region looks very volatile for the first half of September. It should stay warm, sticky and unsettled this week before cooling down for the weekend and bouncing back warmer to start next week. The highest elevations could see lows in the 50s during the weekend. After that, temperatures look to settle into their long-term natural decline through the end of astronomical summer. This region is likely finished with high temperatures breaking 90 after this Thursday. 80s are certainly possible into October but 70s should soon become the new range. The first half of September looks much wetter than the second half. After the first week of September, thunderstorm chances should also decline. The concentration of rainy days in the Sept 6-13 time-frame would likely include a synoptic system or two.

Interior Coastal Plain and Newark Basin from SWNJ-CNJ-NENJ

(Salem, Gloucester, Camden, W. Burlington, Mercer, W. Monmouth, Middlesex, S. Somerset, Union, Essex, Hudson, Bergen, and S. Passaic) – Known for naturally higher temperatures due to lower elevations away from the oceanic influence. This region is also known as “heat island” due to transportation (I-95 corridor), smog, abundant asphalt, concrete, and other man-made substances that naturally absorb and retain heat moreso than natural protected land. This is why excessive heat warnings and air quality alerts are more common in this region. SWNJ always tends to run a few degrees warmer than NENJ but this region is very similar otherwise in micro-climate due to the parallel nature of the Appalachian Mountain elevations to the NW. The same micro-climate can be extended into SE PA and NE MD which tends to run just a little stormier than NJ. This however is what makes up the interior coastal plain.

Interior Coastal Plain and Newark Basin Discussion: This region looks very volatile for the first half of September. It should stay warm, sticky and unsettled this week before cooling down for the weekend and bouncing back warmer to start next week. After that, temperatures look to settle into their long-term natural decline through the end of astronomical summer. This region is possibly finished with high temperatures breaking 90 after this Thursday. I would not be surprised if such happened however given the warming ability of the I-95 urban corridor.  Otherwise I would expect several transient periods of highs breaking into the 80s with a few cooler days nested between. The above graph should visualize this better for you. The first half of September looks much wetter than the second half. The concentration of rainy days in the Sept 6-13 time-frame would likely include a synoptic system or two.

Coastal Regions of SENJ

(Cumberland, Cape May, Atlantic, E. Burlington, Ocean, and E. Monmouth) – Known for tremendous influence from the Atlantic Ocean. Oceanic influence keeps this zone cooler in the summer and warmer in the winter than the interior coastal plain and especially the higher elevations of NWNJ. In the summer, sea breeze fronts back into the coast and can ignite thunderstorms if enough instability is present. The cooler marine air slides under the hot air to the W and provides additional atmospheric lifting. This is both why it’s 5-15 degrees cooler at the shore than the Philly-Trenton area and why near-stationary thunderstorms can form along the coast capable of producing localized flash flooding. In the winter, the ocean is warmer than interior regions which plays a huge role in rain vs. snow—highly dependent on wind direction. When the winds chance from NE to N/NE, that’s usually when temps crash and change rain over to snow. Regardless, this micro-climate is well known, well documented and well expressed. This region extends into most of Delaware as well.

Coastal Region Discussion: This region looks very volatile for the first half of September. It should stay warm, sticky and unsettled this week before cooling down for the weekend and bouncing back warmer to start next week. Unlike the other regions, the weekend cool down should be moderated/inhibited by the warm ocean temperatures. After that, temperatures look to settle into their long-term natural decline through the end of astronomical summer. This region is possibly finished with high temperatures breaking 90 after ~September 10, and that’s only if September 10 spikes warm enough. The first half of September looks much wetter than the second half. The concentration of rainy days in the Sept 6-13 time-frame would likely include a synoptic system or two.

In English: The common theme here warm, muggy and unsettled this week followed by a cooler and possibly wetter weekend. After that initial volatile start to the first third of September, temperatures should moderate in fluctuation. We’re obviously watching what Florence could potentially do to the E US in the September ~13-14 time frame. Regardless, at least one or two synoptic rain systems should come through and make the first half of September wetter than the second half. Everyone have a great rest of your September and please be safe! JC

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Jonathan Carr

Jonathan Carr (JC) is the founder and sole operator of Weather NJ, New Jersey’s largest independent weather reporting agency. Since 2010, Jonathan has provided weather safety and forecasting services for New Jersey and immediate surrounding areas through the web, social media, and app spaces. Originally branded as Severe NJ Weather (before 2014), Weather NJ is proud to bring you accurate and responsible discussions ahead of high-stakes weather scenarios that impact the garden state. All Weather. All New Jersey.™