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A weather map showing the tropical moisture system impacting Nova Scotia. Photo: Environment Canada.

Rainfall warnings issued as tropical moisture system arrives in NS

By Evan Taylor Aug 18, 2023 | 1:49 PM

Following a recurring pattern witnessed throughout this summer, Nova Scotia is set to experience the effects of a tropical moisture system moving in from the southern regions.

This atmospheric phenomenon is expected to bring periods of rain accompanied by heavy downpours and a chance of thunderstorms.

As the week draws to a close, another surge of tropical moisture is making its way towards the province, driven by a sequence of meteorological conditions originating from the Gulf of Mexico and the Caribbean. These atmospheric influences are traversing the Atlantic Ocean, which has maintained temperatures consistently higher than average.

The origin of this rainfall from the Atlantic Ocean introduces an element of uncertainty concerning the precise locations that will encounter the most intense precipitation. While forecasts suggest the likelihood of heavy downpours and thunderstorms, potentially resulting in over 50 mm of rain, the exact spots where these weather patterns will manifest remain challenging to pinpoint. Initial assessments, however, indicate that the southwestern part of Nova Scotia, particularly along the Atlantic coastline, is most susceptible to receiving a widespread 30-50 mm of rainfall by the early hours of Saturday. In specific areas, such as coastal regions, the projected rainfall might even reach 50-75 mm.

Considering the potential for thunderstorms to accompany this atmospheric system, the prospect of certain locales receiving rainfall exceeding 75 mm is not ruled out. The rapid accumulation of such significant precipitation in a short timeframe carries the risk of localized flash flooding. To address these concerns, Environment and Climate Change Canada has issued rainfall warnings encompassing several Nova Scotia counties along the Atlantic Coast, extending from Yarmouth County to Guysborough County, as well as the Annapolis Valley.

Officials have advised residents regarding the potential hazards associated with similar weather patterns in the past, including hazardous driving conditions, water pooling on roadways, and the potential for localized flooding in low-lying areas. In response, residents are strongly advised to take preventive measures such as clearing storm drains and gutters of debris. Additionally, individuals are encouraged to verify the functionality of their sump pumps, given the impending weather conditions.



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