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September: Plenty Of Tropical Air

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September may have been the most active month of hurricanes on record.  Meteorologists use an index, based on an energy calculation from the maximum wind speeds every six hours.  The Atlantic Cyclone Energy (ACE) Index in September 2017 was very high, given the number of major hurricanes that developed (Irma, Jose, Lee and Maria). Screen Shot 2017-10-02 at 5.10.30 AM Screen Shot 2017-10-02 at 5.11.53 AM

While there was a couple of enhanced rainfall events (e.g. 50-90mm in Nova Scotia from Maria moisture). the Maritimes were mostly impacted by persistent warm and humid tropical air during the month of September.

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Temperatures were well above normal, with Fredericton being between 3 and 4C above normal for the month.  Precipitation was quite variable, with heavy tropical downpours contributing to the above normal amounts in Halifax, Saint John and Sydney.

Looking ahead into October, in spite of a cool start, there will likely be more tropical activity in the Atlantic, giving the Maritimes some warm and potentially damp weather.  Ocean waters remain warm (especially where hurricanes have not developed), and models do predict the likelihood of a warmer than normal October.

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Sea Surface Temperature anomalies (red/orange warmer than normal)

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Enjoy and stay safe


About Jim Abraham

Jim has spent about 40 years in the weather business. He has been an operational forecaster from Halifax to Whitehorse. Jim started the Canadian Hurricane Centre, and has flown into a couple of these storms. As a senior executive within Environment Canada, Jim has managed weather research, weather services, and weather/water/climate observing programs. Retired from Environment Canada, Jim is the Atlantic Director for the Canadian Climate Forum, the president of the Halifax chapter of the Canadian Meteorological & Oceanographic Society, a partner in Climaction Services, and a part-time meteorologist on CBC radio. He is still participating in national and international activities related to weather preparedness. Having witnessed unprecedented advances in the science and technology of meteorology. Jim hopes that this blog will also be educational; enabling users to better understand weather-related phenomena, better interpret available information, and ultimately better able to make decisions to protect themselves, their family and their property. Jim welcomes any questions and suggestions.


The views and opinions expressed in this content are those of the author and do not necessarily reflect those of haligonia.ca.


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