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December 18-20 Talking Points - Part 2


am19psu

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So basically if you went on vacation for three days and came back, you would have thought the models were being pretty consistent.

Yes, Tony... and another reason to go on vacation would have been to miss the Lee signing lol.  Actually Francesa did just that.

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I agree we should be cautiously optimistic. Just as we shouldn't all jump off bridges when a bad run comes in we shouldn't assume it's going to happen from one awesome run. But it is the Euro and within 72 hours

Yesterday, the Euro ignored the players that are on the field today. That's the short answer.

Of course, the model gods giveth and the model gods taketh away, so I wouldn't be jumping for joy just yet. I am sure that once DT, John, and others have a chance to really analyze the maps and the variables leading the current solution, we could have a better grasp on how valid this solution is.

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Chilllll, that was a beast run by the Euro. I literally had the same reaction I had on Sunday when it showed the storm burying us. Now, there is a little more confidence. With better sampling data, and the players on the field, the models tonight will have a much better grasp on the future of the s/w out west.

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EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

141 PM EST THU DEC 16 2010

VALID 12Z SUN DEC 19 2010 - 12Z THU DEC 23 2010

...INCREASING THREAT OF MAJOR EAST COAST WINTER STORM...

...CONTINUED HEAVY PRECIPITATION INTO THE WEST...

EXTREME HIGH LATITUDE BLOCK TO RETROGRADE TO NCENTRAL CANADA

LOCKING IN TROFS OVER THE ERN PACIFIC AND WESTERN ATLC MID TO LATE

PERIOD. PRIOR TO THAT FAST ZONAL PAC FLOW CONTS TO DRIVE INTO THE

WEST AND EASTERN THRU THE PLAINS WITH A FIRST RELATIVELY AMPLIFIED

SHORTWAVE COMING TOWARDS THE EAST COAST SUNDAY AND ROTATING NWD

WITH A DEEP OFF SHORE STORM FOLLOWED BY BRIEFLY ZONAL FLOW AGAIN

WITH EMBEDDED WAEKER SHORTWAVES COMING ACROSS THE PLAINS TO THE

EAST.

UPDATED MORNING PRELIMS BLENDED THE 00Z UKMET WITH THE 00Z ECMWF

ENS MEAN DAYS 3 TO 5.

THIS KEPT UP A WIND AND COASTAL SNOW THREAT ALONG THE NEW ENGLAND

COAST DAYS 4-5 LATE SUN INTO TUES. OPERATIONAL RUNS OF 00Z ECMWF

AND GFS HAVE REVERSED SOLUTIONS SINCE YTDAS 12Z RUNS WITH THE N

ATLC LOW. LAGGED AVERAGE FORECAST OF LAST 4 RUNS OF BOTH GFS AND

ECMWF PREFERRED KEEPING THE SFC LOW EAST OF THE 00Z OP ECMWF

CLOSER TO THE 00Z ECMWF ENS MEAN AND EASILY CLOSE ENOUGH TO AFFECT

COASTAL NEW ENGLAND.

12Z GFS HAS SWITCHED BACK TO A DEEPER MUCH CLOSER IN LOW CLOSE TO

YTDAS 12Z GFS AND CURRENT 00Z ECMWF TAKING A 980 MB OFF CAPE COD.

THIS SCENARIO FOLLOWS YTDAS HPC PROGS AND THINKING AS MODELS BEGIN

TO CONVERGE ON A MORE AGREED UPON SOLUTION WITH GOOD HPC FORECAST

CONTINUITY FROM YESTERDAY. 12Z UKMET NOW DEEPER AND A BIT FARTHER

OFF WHILE THE OP CMC HAS A 976 MB LOW NEAR THE NORTHEAST BENCHMARK

AT 40/70 WHILE ECMWF HAS ITS 975 MB LOW NEAR BLOCK ISLAND SOUND.

NAVY NOGAPS ALSO DEEP AND CLOSE IN TO CAPE COD. GFS ENS MEANS A

BIT EAST BUT MEAN PCPN SHOWING A SIG PCPN EVENT OVER COASTAL MA.

AFTN PROGS WILL ADJUST SLIGHTLY WEST HAVING A DEEP LOW NEAR THE

NORTHEAST BENCHMARK. MODELS ARE CONVERGING ON THIS SOLUTION WITH

INCREASED FORECASTER CONFIDNECE.

RAPID DEEPENING INDICATED BY 12Z GFS/CMC/00Z AND 12Z ECMWF MODELS

FOLLOWS DYNAMICS AND THE INFLUENCE OF INCREASED BAROCLINICITY DUE

TO THE DE STABILIZATION OVER RELATIVELY WARM OCEAN WATERS FROM THE

RECENT COLD AIR OUTBREAK MEETING. THIS INCREASES THE THREAT OF A

SNOW EVENT ALONG THE MID ATLC COAST FROM EASTERN VA UP THE COAST

AND ESPECIALLY A HEAVY SNOW THREAT FOR COASTAL NEW ENGLAND. SOME

ADDITIONAL WESTWARD ADJUSTMENT MADE FROM THIS MORNINGS PRELIMS

WITH AFTN UPDATED PROGS INCLUDING OPERATIONAL 12Z GFS AND 12Z CMC.

HIGH WIND AND SNOW THREAT NEW ENG COAST LATE SUNDAY AND MONDAY.

NEXT CLIPPER TYPE OF LOW ADJUSTED SOUTHWARD IN ITS TRACK THAN GFS

TO COME THRU THE SRN APPLCHNS AND OFF NC COAST TUES. BLEND OF

GFS/ECMWF ENS MADE WHICH ALSO MATCHES A LAGGED AVERAGE FORECAST

FOR DAYS 6 AND 7.

HVY/EXCESSIVE PCPN THREAT THRU THE PERIOD CONTINUES OVER ALL OF CA

AND INTO THE LOWER GREAT BASIN AND SRN ROCKIES AND SHOULD CONTINUE

BEYOND THIS FORECAST PERIOD WITH TEH CONTINUOS ONSHORE MID LEVEL

FLOW AND OCCASSIONAL FRONTS. 5 DAY LIQUID EQUIV TOTALS EXCEED 6-8

INCHES IN THE SIERRAS/COASTAL RANGES AND SAN DIEGO/LOS ANGELES

RANGES GIVING WEEKLY TOTAL POTENTIALS IN EXCESS OF 10-15 INCHES

OVER FAVORBLE TERRAIN.

CLIPPER TYPE LIGHT PCPN EVENT EXPECTED FROM THE PLAINS INTO THE

MID ATLC REGION MON INTO TUESDAY FOLLOWED BY A RETURN OF

WIDESPREAD BREEZY AND COLD CONDITIONS OVER THE ERN THIRD OF CONUS.

ROSENSTEIN

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Thought some of you might appreciate this. OSU?

12Z GFS HAS SWITCHED BACK TO A DEEPER MUCH CLOSER IN LOW CLOSE TO

YTDAS 12Z GFS AND CURRENT 00Z ECMWF TAKING A 980 MB OFF CAPE COD.

THIS SCENARIO FOLLOWS YTDAS HPC PROGS AND THINKING AS MODELS BEGIN

TO CONVERGE ON A MORE AGREED UPON SOLUTION WITH GOOD HPC FORECAST

CONTINUITY FROM YESTERDAY. 12Z UKMET NOW DEEPER AND A BIT FARTHER

OFF WHILE THE OP CMC HAS A 976 MB LOW NEAR THE NORTHEAST BENCHMARK

AT 40/70 WHILE ECMWF HAS ITS 975 MB LOW NEAR BLOCK ISLAND SOUND.

NAVY NOGAPS ALSO DEEP AND CLOSE IN TO CAPE COD. GFS ENS MEANS A

BIT EAST BUT MEAN PCPN SHOWING A SIG PCPN EVENT OVER COASTAL MA.

AFTN PROGS WILL ADJUST SLIGHTLY WEST HAVING A DEEP LOW NEAR THE

NORTHEAST BENCHMARK. MODELS ARE CONVERGING ON THIS SOLUTION WITH

INCREASED FORECASTER CONFIDNECE.

RAPID DEEPENING INDICATED BY 12Z GFS/CMC/00Z AND 12Z ECMWF MODELS

FOLLOWS DYNAMICS AND THE INFLUENCE OF INCREASED BAROCLINICITY DUE

TO THE DE STABILIZATION OVER RELATIVELY WARM OCEAN WATERS FROM THE

RECENT COLD AIR OUTBREAK MEETING. THIS INCREASES THE THREAT OF A

SNOW EVENT ALONG THE MID ATLC COAST FROM EASTERN VA UP THE COAST

AND ESPECIALLY A HEAVY SNOW THREAT FOR COASTAL NEW ENGLAND. SOME

ADDITIONAL WESTWARD ADJUSTMENT MADE FROM THIS MORNINGS PRELIMS

WITH AFTN UPDATED PROGS INCLUDING OPERATIONAL 12Z GFS AND 12Z CMC.

HIGH WIND AND SNOW THREAT NEW ENG COAST LATE SUNDAY AND MONDAY.

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That map just Above is ridiculous- a 2/25 repeat but with all snow on LI would be insane.. A repeat of 12/19/09 would be equally great. What type of temps are we talking about as this storm winds down - mid 20's?? Also the low sun angle thus time of the year should make things last longer as compared to the 2/25/10 storm..

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We've got to appreciate these types of early winter storms. December storms can be amazing because they are typically the first significant snow events of the season, there is absolutely no worry about the sun angle that may become more of an issue in late February and March.

What is the time frame for the storm? When would it start, when would it snow the hardest, and when would it end? All I know is that it's supposedly going to start on Sunday.

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