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February 2016 Forecasts/Disco/Obs


snowman19

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9nhwbg_conus.gif

EXTENDED FORECAST DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

1059 AM EST WED FEB 17 2016

VALID 12Z SAT FEB 20 2016 - 12Z WED FEB 24 2016

...OVERVIEW...

CONTINUE TO EXPECT INITIALLY LOW AMPLITUDE MEAN FLOW ACROSS THE

LOWER 48 TO AMPLIFY SIGNIFICANTLY INTO A WRN RIDGE/ERN TROUGH

PATTERN IN RESPONSE TO DEEP ERN PAC MEAN TROUGHING. THIS

EVOLUTION WILL SUPPORT MEANINGFUL ERN U.S. STORM POTENTIAL BY NEXT

TUE-WED... THOUGH CRUCIAL SHRTWV DETAILS ARE ON A SMALL ENOUGH

SCALE THAT CONFIDENCE IS NOT YET THAT GREAT IN EXACTLY HOW THE

SYSTEM WILL EVOLVE.

...GUIDANCE/UNCERTAINTY ASSESSMENT...

DAYS 6-7 TUE-WED START WITH A 60/40 BLEND OF WPC CONTINUITY AND

THE 00Z ECMWF MEAN... BASED ON GOOD ENSEMBLE MEAN

CONSENSUS/CONTINUITY ACROSS THE ERN PAC/WRN NOAM AND PREFERENCE TO

MAINTAIN A CONSISTENT AND INTERMEDIATE EVOLUTION FOR THE SYSTEM

THAT MAY EVOLVE NEAR THE EAST COAST. SOME ASPECTS OF THE 00Z

ECMWF BECOME PARTICULARLY QUESTIONABLE IN THIS TIME FRAME AS ITS

NRN ROCKIES-PLAINS INTO SRN CANADA RIDGE ALOFT BECOMES EXTREMELY

STRONG AND VERY LOCALLY TO THE POINT OF BEING AN OUTLIER RELATIVE

TO THE FULL ENSEMBLE ENVELOPE. DIFFS IN HOW INCOMING WRN CONUS

ENERGY AS OF MON AMPLIFIES INTO THE ERN MEAN TROUGH AND WHAT KIND

OF INTERACTION THERE IS FROM CANADIAN FLOW CONTINUE TO RESULT IN

CONSIDERABLE UNCERTAINTY IN HOW ERN U.S. LOW PRES WILL EVOLVE.

MEMBERS FROM THE 00Z GEFS/ECMWF/CMC ENSEMBLE SYSTEMS ALL SHOW A

VERY WIDE SPREAD BY DAY 7 WED... RANGING FROM THE LOWER HALF OF

THE MS VLY TO WELL OFFSHORE THE EAST COAST. INDIVIDUAL GFS/ECMWF

RUNS AND ENSEMBLE MEANS ARE GENERALLY FOCUSING ON A TRACK CLOSE TO

THE EAST COAST BUT WITH CONSIDERABLE DIFFS IN THE EXTENT OF NWD

ELONGATION. LACK OF CONFIDENCE IN ANY ALTERNATIVE SCENARIO

SUPPORTS MAINTAINING AN INTERMEDIATE SOLN AS CLOSE AS PSBL TO

CONTINUITY. ALONG THE WEST COAST THERE IS CURRENTLY DECENT

AGREEMENT THAT ANOTHER SHRTWV EJECTING FROM THE ERN PAC MEAN

TROUGH WILL ARRIVE AROUND 12Z WED. THE FACT THAT THIS ENERGY IS

HEADING INTO A STRONG MEAN RIDGE SUPPORTS THE WEAKER ENSEMBLE

MEANS AND 00Z-06Z GFS VERSUS THE 00Z ECMWF.

 

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IMO, all this tells us is a storm will form along the East Coast in a week. Where it goes from there (inland, coastal hugger, benchmark, OTS) is anybody's guess. In my experience, the big city storms are depicted mostly as all snow events or OTS (and then come back). Rarely have I seen big snows in NYC when the models ever show a snow to rain scenario. But I won't trust the snow output from any model until inside 48 hrs.

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actually I ass-u-me it is - But I meant for most of the  NYC metro

I have no idea why you would make such a misleading post. 

 

The only model that brings significant snow to the immediate coast is the Euro and even that run verbatim wouldn't be more than a low end warning criteria event East of the city.

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I have no idea why you would make such a misleading post. 

 

The only model that brings significant snow to the immediate coast is the Euro and even that run verbatim wouldn't be more than a low end warning criteria event East of the city.

nobody said it would be more then a low end warning - and I am sure many of us would be happy with that - the thing to watch in the model runs is the North American view to see if any high lat blocking is going to develop that would help us out immensely with the cold air staying put...looks good for a + PNA 

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I have no idea why you would make such a misleading post. 

 

The only model that brings significant snow to the immediate coast is the Euro and even that run verbatim wouldn't be more than a low end warning criteria event East of the city.

 

The NUMBER 1 skill score model the PARA  buries the coast with 12 - 16  it leaves the NW suburbs in the 2-4 area . 

 

The EPS is as good as is gets 7 days away .

 

The UKMET at 144 is blend of the Euro and GFS and may look like the JMA .

jma_mslpa_namer_9.png

 

 

The GFS/CMC OPS are certainly W but don`t match the higher skill score models or it`s ensemble guidance . 

 

The GEPS is E of it`s OP .

 

gem-ens_mslpa_us_32.png

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http://www.esrl.noaa.gov/psd/forecasts/reforecast2/wx_maps/html/mslp_f192_us.html

 

I don't know much

but I know the good stuff......

 

:weenie: :weenie: :weenie:

thats a three dog night right there

cold tap looks fine from this angle----IMO---

 

 

 

recipe is on the page

how will the cake turn out??

http://www.esrl.noaa.gov/psd/forecasts/reforecast2/wx_maps/html/spag_f216_us.html

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A lot of volatility in the pattern here. Should be very interesting moving forward as both heat and cold sources battle with increased sun angle and warm SSTs giving more fuel to the fire. Snow or not, the atmosphere seems ripe for deepening cyclogenesis on the East Coast given increasingly large temperature contrasts and lots of energy coming through the pipeline.

Sent from my SM-N910V using Tapatalk

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The NUMBER 1 skill score model the PARA  buries the coast with 12 - 16  it leaves the NW suburbs in the 2-4 area . 

 

The EPS is as good as is gets 7 days away .

 

The UKMET at 144 is blend of the Euro and GFS and may look like the JMA .

 

 

 

The GFS/CMC OPS are certainly W but don`t match the higher skill score models or it`s ensemble guidance . 

 

The GEPS is E of it`s OP .

 

 

For starters the PARA Euro has been highly unstable. It was terrible with the blizzard back in January.

 

Secondly, I just went back and looked at the 00z Euro Para run and it barely has any measurable snow West of Long Island. It's a good run for New England and the east end, and an Eastern outlier at this point. Furthermore, we don't have the 12z run yet which could be completely different.

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