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CINDY DAY: Retrograding low steals the show

jan 8 NA outlook -WSI
- WSI

In all my years in this racket - as my dad would say - I can’t recall a weather pattern like this one.   

For a solid week now, a stalled area of high pressure out over the Labrador Sea has taken control. Weather systems developing in a trough off the U.S. east coast are blocked as they enter Canadian waters (that is not a political statement).  Earlier this week, a strong area of low pressure stalled in that trough and was long enough to split into two systems, with nowhere to go. That’s when the unusual retrograde began; instead of the typical west to east flow, the systems started to track from east to west.   

- WSI
- WSI

 

The counterclockwise circulation around the backing scenario put the warmest temperatures in Atlantic Canada over Newfoundland. The northwest wind behind the scenario continues to feed colder air into the moisture-laden systems, resulting in persistent onshore snow across P.E.I., parts of northern Nova Scotia and western Cape Breton.   

Overnight, the blocking high will relent, and the weakening systems will start to track eastward. Falling temperatures will change showers to flurries across Newfoundland on Saturday as partial clearing approaches from the west.  

I don’t see a lot of cold air on the horizon: daytime high temperatures will be just slightly below freezing until midweek.  

- WSI
- WSI

 


Cindy Day is the chief meteorologist for SaltWire Network

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