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Looking towards the beginning of December


CoastalWx

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I've said before...can't wait for my mix to rain as New England is more wintry mid Dec. Lol

Or our rain to rain event. But on the bright side you do get good at guessing the different temperatures of rain drops as they run down your back. Amazing how much colder 35F rain feels versus 40F.

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the transition to +pna is well underway and the 11th event may in fact be the entrance scenario discussed in the other thread, but this run clearly has wave interference issues. not that anyone is but i wouldn't look any deeper into this run than a rip and read. it's not going to be worth it to do so -

That's not a +PNA on the EC.

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Is the 11th the first shot at our any wintry precip? is that weekend deal squashed you think?

There's an outside shot at a little snow in the 8-9th event, but I'm pretty skeptical of it. The event itself doesn't look overly impressive. Getting cold in here might be tough before that event even if it occurs.

The Euro actually has a front running wave before the 11th...sandwiched in between the two systems...it gives us some light overrunning snow early on the 10th.

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There's an outside shot at a little snow in the 8-9th event, but I'm pretty skeptical of it. The event itself doesn't look overly impressive. Getting cold in here might be tough before that event even if it occurs.

The Euro actually has a front running wave before the 11th...sandwiched in between the two systems...it gives us some light overrunning snow early on the 10th.

Nice..So even though it probably won't shake out like that..we really have to feel decent about some winter wx later this week. Just keep telling myself..get thru these next 2 days..get thru these next 2 days

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Keeps the northern tier pretty cold. NAO is negative...EPO region is not that great, but still pretty good ridging in the Kamchatka region which keeps enough cross polar flow to keep Canada quite cold.

I think it's at least trying to show heights rebuilding towards the end which would

be nice. Very gradient like so I hope we can keep that -NAO.

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Yeah today was one of those dirty..almost filthy days where it underperformed..theme of the season so far.. Tomorrow might be the same, but Tuesday we will def. lose a few folks

The little events have overperformed, yesterday was a nice early winter day. A couple of warm days in early Dec is nothing to worry about as the trend is good. The torches have been underperforming lately. I think we get some fun just as the holidays are here in earnest. You have the week between xmas and new years off? That should be a good stretch of winter I think. My neighbors have snowmobiles and we have hundreds of miles of trails right outside the door. Plan to be on trails that week.

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Keeps the northern tier pretty cold. NAO is negative...EPO region is not that great, but still pretty good ridging in the Kamchatka region which keeps enough cross polar flow to keep Canada quite cold.

Gradient?

The blocking on the long range models a week or two ago was so dramatic...I don't really want that. I'm happy with a bit of blocking just to keep things suppressed enough for New England...no need for more Mid Atlantic blizzards at our expense. A cold Canada, a sneaky high and low pressure shooting across.

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Now this sounds like winter, at least in CNE and NNE, and probably eventually SNE. From HPC...but it is the pattern you guys have been talking about as likely to evolve in this period.

THE WESTERN U.S. STORM RELAXES DURING THE MEDIUM RANGE PERIOD. IN

THE EASTERN U.S...A SLOW MOVING FRONT WILL BRING A CHANCE OF RAIN

AND POSSIBLY A ZONE OF WINTRY MIX BY NEXT WEEKEND.

THE MEDIUM RANGE FORECAST FEATURES A GRADUAL CHANGE IN THE LARGE

SCALE PATTERN. A LONG-LIVED REX BLOCK AND SPLIT FLOW REGIME NEAR

AND SOUTH OF THE ALEUTIAN ISLANDS WILL BREAK DOWN. THIS ALLOWS

MORE COLD AIR TO SPILL OFF OF CONTINENTAL ASIA AND DEEPEN A

LONGWAVE TROUGH OVER THE CENTRAL PACIFIC. THIS...IN TURN...PROPS

UP A DOWNSTREAM RIDGE OVER THE EASTERN PACIFIC...BRINGING AN END

TO THE PROLONGED HEAVY RAIN EVENT ALONG THE WEST COAST OF THE U.S.

FARTHER DOWNSTREAM INTO NORTH AMERICA...MODELS AND TELECONNECTIONS

PREDICT DEVELOPMENT OF A BROAD SCALE POSITIVELY TILTED

TROUGH...SUPPORTED BY INTRUSIONS OF ARCTIC AND MODIFIED ARCTIC AIR

INTO THE CENTRAL/EASTERN STATES.

...MODEL CHOICE...

DESPITE AGREEMENT ON THE LARGEST SCALES...THERE ARE SIGNIFICANT

MODEL DIFFERENCES REGARDING SHORTWAVE DETAILS OVER THE PACIFIC AS

EARLY AS DAYS 2 AND 3. THE ECMWF IS AT ONE EXTREME...IN BUILDING

THE EASTERN PACIFIC RIDGE ALMOST IMMEDIATELY INTO ITS FORECAST.

THE GFS...ALONG WITH THE UKMET...MAINTAIN A VERY PRONOUNCED

SHORTWAVE TROUGH UNDERCUTTING THE WEAKENING REX BLOCK EARLY IN THE

PERIOD. THIS SHORTWAVE LOWERS HEIGHTS OVER THE WESTERN

U.S...RESULTING IN THE EVENTUAL BROAD SCALE TROUGH AXIS BEING

FARTHER WEST THAN THE ECMWF ENSEMBLE...AND MUCH FARTHER WEST THAN

THE ECMWF OPERATIONAL RUN. WHILE CONFIDENCE IN THE DETAILS OF ANY

ONE MODEL RUN IS CURRENTLY LOW...CONFIDENCE IS RELATIVELY HIGH

THAT THE RESULTING PATTERN WILL LEAD TO A FRONTAL BOUNDARY

EXTENDING FROM THE SOUTHERN PLAINS TO NEW ENGLAND BY DAYS 6/7.

THERE IS POTENTIAL FOR ONE OR MORE WAVES TO EVOLVE ALONG THE

FRONT...BUT THE OPERATIONAL MODELS ARE NOT LIKELY RESOLVING THE

TIMING OR PLACEMENT OF SUCH WAVES AT THIS TIME.

BY EARLY DAY 3 WED A BLEND OF THE 12Z GFS/ECMWF APPEARS REASONABLE

FOR THE SYSTEMS REACHING W-CNTRL NOAM AND THE EAST COAST AT THAT

TIME. THIS BLEND IS CONTINUED THRU DAY 4 THU. A SLIGHTLY GREATER

WEIGHTING OF THE GEFS/00Z ECMWF ENSEMBLE MEANS IS INTRODUCED DAY 5

FRI AS FCST SPREAD OVER THE PACIFIC COMES INTO THE PICTURE. A

BLEND OF THE 00Z ECMWF/12Z GEFS MEANS SERVES AS THE STARTING POINT

FOR DAYS 6-7 SAT-SUN WITH THE GOAL OF YIELDING SOMEWHAT BETTER

CONTINUITY THAN WOULD LIKELY BE THE CASE IF SELECTING PARTICULAR

DETAILS OF ANY CURRENT OPERATIONAL SOLUTIONS. AT THE SURFACE...WE

ATTEMPT TO DEPICT ONE PRONOUNCED FRONTAL WAVE DEVELOPING IN THE

MID/LOWER MISSISSIPPI VALLEY BY DAYS 5-7...PRIMARILY AS A RESULT

OF LOW LEVEL FORCING/BAROCLINICITY WITHIN SOUTHWESTERLY FLOW ALOFT.

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