It looks like ‘La Nina’ on the way could mean a cold and stormy winter ahead for the south coast with more snow than normal in Chilliwack and across the Lower Mainland.
That “cold and stormy” prediction nugget was at the end of the November weather report by Roger Pannett, volunteer Chilliwack weather observer for Environment Canada.
The month of November 2o2o saw warm windy weather, thunder, hail and even a bit of snow in the higher elevations.
Pannett noted that after “a mild and sunny start to November” a Pacific frontal system, with sub-tropical moisture, produced heavy rain and warm gusty winds. On Nov. 4, temperatures peaked at 18.9 C, 7.9 C above normal, the warmest since the 19.6 C on Nov. 6, 2014.
As a ridge of high pressure built over northern B.C., on Nov. 7 modified arctic air arrived in the Fraser Valley.
With the fresh and gusty northeast winds, the relative humidity decreased to 21%. On Nov. 9 temperatures dipped to the low temperature for the month at -0.5 ⁰C with some wet snow the following evening.
By mid-month typical wet and mild November weather conditions returned. However, during the evening of Nov. 13, an unstable and turbulent air mass triggered a rare November thunderstorm plus hail and heavy snowfalls on the high passes. Mild and generally rainy conditions continued to month’s end with strong and gusty south west winds at times.
It was the 13th consecutive month and 5th consecutive November with above normal mean temperatures.
Total precipitation was close to normal.
The City of Chilliwack year to date precipitation totals are 1,392. 5 mm on 175 days compared to the 30-year average of 1,585.7 mm on 152 days.
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