Back to top

September — no temperature records, precipitation close to normal

Between thunderstorms, there were some very nice days in the West Kootenay/Boundary region.

The month of September in 2021 saw no temperature records broken and precipitation close to normal said the monthly weather synopsis from the Southeast Fire Centre.

The media release said alternating ridges and troughs embedded in a prevailing westerly flow prevented any one single synoptic, or large-scale, feature from stalling over the area for more than a few days at a time. 

“This pattern had a moderating effect on temperatures, and, as a result no temperature records were broken,” the Southeast Fire Centre said.

“The mean monthly temperature was 0.5 degrees above average (and) total monthly rainfall of 43.8mm was very close to normal, with only 1.4mm (or 3%) more than the monthly average.”

The Southeast Fire Centre said the average number of days with measurable rain in September is eight.

In 2021, that amount was eleven.

The Southeast Fire Centre said there were two three-day events that brought more than 15mm of rain. 

The first, from September 17th to the 19th, was partially fed by the remnants of an arm of moisture spinning off Typhoon Chanthu that then traversed the Pacific on its way to the West Kootenay. 

The second, from September 26th to the 28th, resulted from a frontal wave and subsequent instability triggered by a pool of cold air aloft associated with a deep upper trough approaching from the northwest. 

“This pool of cold air aloft, combined with a bit of surface/solar heating supported the development of isolated late-season thunderstorms in the area,” the Southeast Fire Centre said.

Temperatures are expected to hover around the low teens for the next week with a mixed bag of weather for the region.