Nearly 4 inches of snow fell yesterday at Whitehorse with a high of about -4 deg F. However the airport is reporting a total of 13 inches on the ground today, a total curiously similar to yesterday report before the new snow fell.Thoughts:
Forecast models are tending to hold onto the ridge of high pressure with each successive model run. This is not good news for cold weather fans. Today's figure shows a plot of upper levels winds (colors) over time across all longitudes of the globe. The red colors are south winds and the blue colors are north winds in upper levels of the atmosphere, around 5 km above the ground. The location of Whitehorse is marked by the bold black line (-135 longitude). The white area in between the reds and blues is the center of the high pressure ridge (calm winds at the center of a high pressure). Things to notice:
(1) The ridge of high pressure is showing very strong resistance to move eastward (to the right) over time and
(2) By Friday night and into Saturday, the jet stream may move closer to the area, increasing the chances of precipitation.
What you can not see as easily from the map are the temperatures. A ridge of high pressure in upper levels of the atmosphere means warm temperatures. As long as this center of the high pressure is nearby, temperatures will stay warm.
Forecast:
Warm temperatures are now likely to hang on through Saturday. Highs are looking to be 35-40 deg F Friday and Saturday. Clouds will be on the increase Friday and especially Saturday, which will also keep low temperatures warm, probably above freezing both Friday and Saturday. Therefore any precipitation on Friday or Saturday should be in the form of rain. Forecast still on track for cooler temperatures Sunday with a changeover of any precip to snow.
Fun Facts:
--- If rain falls on Saturday, this would be the first time that it has ever rained on that date in Whitehorse.
--- Low temperatures Friday and Saturday may be running 25 deg F above the average HIGH temperature
--- Record high temperatures are a good possibility
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