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It's all about the High Pressure

Dec1712.JPG
This beautiful Labrador sunset shot was taken by Neil Simmons in Labrador West.

Hey Folks,

Well what a weekend and what a storm for Newfoundland. In the end, a good shot of snow for both the West and East Coasts of Newfoundland, with a taste of Snow for Central as well. As mentioned on Live Blog, St. John's YYT ended up with 24 cm in all. However this was another 'elevation variation' storm, with many of you reporting just 5-10 cm of Snow in places like CBS and along the Coastline. However places like in Mount Pearl, Kenmount Terrace, Paradise and other high elevation areas, you likely had the full 20-25 cm shot. Here's Environment Canada's official recap:

THE FOLLOWING ARE UNOFFICIAL TOTAL SNOWFALL OBSERVATIONS AS OF
12:30 PM NST SUNDAY:

MANNED OBSERVATION SITES:
ST. JOHN'S AIRPORT........................... 24 CM
DEER LAKE AIRPORT............................ 18 CM
GANDER AIRPORT............................... 8  CM
STEPHENVILLE AIRPORT......................... 6  CM

PRIVATE WEATHER STATION SITES:
COWAN HEIGHTS ............................... 24 CM
WHITBOURNE .................................. 15 CM
LETHBRIDGE .................................. 10 CM

WE HAVE HAD ADDITIONAL REPORTS OF ROUGHLY 5 CM NEAR THE COASTLINE OF CBS.

THE FOLLOWING ARE UNOFFICIAL TOTAL WATER EQUIVALENT OBSERVED AS OF 
12:30 PM NST SUNDAY:

AUTOMATIC WEATHER STATION SITES:
TERRA NOVA................................... 16.2 MM*
CORNER BROOK................................. 13.4 MM*

* ACTUAL SNOWFALL AMOUNTS MAY DIFFER DEPENDING ON LIQUID WATER TO
SNOWFALL RATIOS FOR THE AREA.
 
HIGH PRESSURE DOMINATES THIS WEEK
 
This week's forecast will be completely dominated by an area of High pressure, which will be parked over the region and keeping things quiet. That area of High pressure is already moving into the region, as our weekend storm departs. Around that High, Northerly winds are really gusting along the Northeast Coast, blowing in flurries mixing with some showers & drizzle. Those onshore flurries will continue to blow into the Northeast Coast tonight, Tuesday, Wednesday & possibly into Thursday as the Northerly flow continues around our High just to the West. Meanwhile, most of Labrador & the West Coast are looking at a beautiful Sunny forecast for most of the week as the High sits overhead.


That area of High pressure is going to be strong enough, that a Low moving Northeastward into the Maritimes on Tuesday, will be forced to the East and as a result will stay South of Newfoundland. At one point, this Low was looking like a Snow/Rain event for Newfoundland as well, but that High is just too strong.
 
LONG RANGE

As we move into the later parts of this week, it appears our High will move Southeastward, bringing the onshore flow to an end for the Northeast Coast and allowing the Sun to re-appear. Once again the strength of that High will be key to the forecast, but this time for the weekend time frame, as another Low moves Northeast out of the Great Lakes and will be knocking on our door. As of now, forecast models are still flip flopping on whether that high will once again be strong enough to send that system to our South, or whether it moves into the region.


IF that system does indeed move into Newfoundland and Labrador, the strength of that High will still be key for the track of the weekend system and whether we see Snow or Rain... or both. Obviously this is going to be important given how much traveling will be happening this weekend, the weekend just before Christmas.  
 
Indeed, it's all about the High pressure.
 
I'll keep you posted.
 
Ryan

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