Cooler temperature leads to double snow amount for November
Cooler than average temperatures in November almost doubled the normal amount of snow this month said the Southeast Fire Centre Weather Services monthly media release synopsis.
The Weather Service said November had the coolest mean monthly temperature in more than 20 years — 3.2 degrees lower than normal.
“Cooler than average temperatures helped bring almost double the normal amount of snow this month while total rainfall was only one-quarter of the average amount,” the Southeast Fire Centre Weather Services said.
“Total precipitation was 27% below normal.”
The Southeast Fire Centre Weather Services said a pair of upper lows that approached from the north Pacific early in the month brought cool temperatures and rain each day until November 5th.
The precipitation turned to snow each day until November 8th as temperatures cooled and freezing levels trended progressively lower.
“A dry northerly flow aloft dominated much of the following ten days downstream of a strong, blocking ridge centered over or just west of the BC coast,” the Southeast Fire Centre Weather Services said.
“This upper flow pattern helped support the southward advancement of cold and dry air originating over the Arctic.”
The Southeast Fire Centre Weather Services said one of these surface-based surges of cold and dense air brought northerly gusts of wind of 52km/hr on November 9th with a transition to more active, conditions that saw more snow during the last 10 days of the month as a succession of waves of Pacific moisture overrode the cool airmass in place at the surface.
The Southeast Fire Centre Weather Services said the most notable event during this period was when over 35cm of relatively low-density snow fell during the last two days of the month (37.4cm from 25.4mm of melted water equivalent).
The Southeast Fire Centre Weather Services said no temperature or precipitation records were broken this month.