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Potential Storm 2/17-2/19


Snow_Miser

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take a look at a latitude longitude map. It is EXACTLY a 50/50 low. It is basically over newfoundland around as the storm is forming and begins to cut. 

yes, at 138-144hrs...at 162 its been displaced. no use arguing the GFS at 144 hrs however

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When is the first run?

MAJOR UPGRADE TO THE GLOBAL DETERMINISTIC PREDICTION SYSTEM GDPS-

VERSION 3.0.0) AT THE CANADIAN METEOROLOGICAL CENTRE

ON WEDNESDAY FEBRUARY 13, 2013, STARTING WITH THE 1200 UTC RUN, THE

CANADIAN METEOROLOGICAL CENTRE (CMC) OF THE METEOROLOGICAL SERVICE

OF CANADA (MSC) WILL IMPLEMENT VERSION 3.0.0 OF ITS GLOBAL

DETERMINISTIC PREDICTION SYSTEM (GDPS), HEREAFTER REFERRED TO AS

GDPS-3.0.0. THE MAIN CHANGES OF THIS UPDATE ARE:

- CHANGES TO THE 4D-VAR DATA ASSIMILATION SYSTEM: - THE USE OF

ADDITIONAL REMOTE SENSING DATA: - AN INCREASE IN HORIZONTAL

RESOLUTION FROM 33 TO 25 KM: - IMPORTANT CHANGES IN THE GEM MODEL

PHYSICS: - AND 1200 UTC RUNS NOW DONE TO 240 HOURS AS FOR 0000 UTC

RUNS.

OBJECTIVE SCORES DONE IN DEVELOPMENT AND PARALLEL RUN PHASES SHOW

IMPROVEMENTS IN THE FORECASTS WITH MOST METRICS THROUGHOUT MOST OF

THE ATMOSPHERE, IN PARTICULAR OVER NORTH AMERICA IN WINTER. THESE

IMPROVEMENTS ARE OF AN ORDER OF MAGNITUDE USUALLY SEEN ONLY ONCE IN

A DECADE. A SUBJECTIVE EVALUATION BY OPERATIONAL METEOROLOGISTS AT

CMC CONFIRMED THOSE IMPROVEMENTS. OTHER FORECAST SYSTEMS WHICH

DEPEND ON GDPS OUTPUT ALSO BENEFIT FROM THE GDPS-3.0.0. CHANGES

WERE MADE TO THE REGIONAL DETERMINISTIC PREDICTION SYSTEM (RDPS) TO

HARMONIZE IT WITH THE NEW GDPS, AND THE RDPS FORECASTS ARE ALSO

IMPROVED AS A RESULT, SO ITS VERSION NUMBER IS ALSO INCREASED TO

3.1.0, AND IS HEREAFTER REFERRED TO AS RDPS-3.1.0.

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If that happens, many here will like the outcome. At this point, I give it about a 20% chance of happening that way.

WX/PT

With that 500mb evolution that would be a widespread 1-2 feet fluff bomb across the area.  Relatively long duration, cold temps, potentially unstable aloft.  Would be lots of fun. And chances are the surface depiction is underdone with that upper level setup.  But I think the chances of anything close to that occuring are much lower than even the 1 in 5 you give it.  Chances of a plowable snow might be close to 1/5 but the GGEM has been trending rapidly with each cycle and the inter and intra model spread is extremely large.  A wild solution is possible, but it seems unlikely that any particular model would have pegged such a wild solution at this juncture.  But then again, we are starting to approach the short range with this potential event.

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