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East Coast winter storm, February 13th-14th, imminent (Part II)


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Maybe 3-5, 5-9, 9-14?

The Euro is not particularly impressive in CT. Seems like we miss out on the good stuff during the day tomorrow and then again tomorrow night.

Dont you think it's a little dangerous to make your forecast off of 1 model? Usually you always preach to use all guidance and not put all eggs in one basket
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MODEL DIAGNOSTIC DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
221 PM EST WED FEB 12 2014

VALID FEB 12/1200 UTC THRU FEB 16/0000 UTC

...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR
INGEST...

==============================================
12Z NAM/GFS EVALUATION AND PREFERENCES
==============================================
NAM/GFS INITIALIZATION ERRORS DO NOT APPEAR TO
SIGNIFICANTLY AFFECT THEIR LARGE SCALE OUTPUT.
==============================================

...FIVE SYSTEMS PRESENTED CHRONOLOGICALLY FROM EAST TO WEST...

...EASTERN U.S. CYCLONE AND WINTER STORM...

PREFERENCE: BLEND OF 12Z GFS/ECMWF...SUPPORTED BY THE 12Z GEFS MEAN
CONFIDENCE: SLIGHTLY ABOVE AVERAGE ON THE LARGE SCALE

NOW AS WE SEE THE ONSET OF THE HIGH IMPACT ICE AND SNOW IN THE
SOUTH...AND THE BULK OF THE IMPACTS ALONG THE MID ATLANTIC ARE
MOVING INTO THE DAY 1 PERIOD...WE ARE ABLE TO RECOMMEND A SIMPLE
BLEND OF OPERATIONAL MODELS. THE ECMWF...UKMET...AND GEFS MEAN
HAVE PERFORMED FAIRLY CONSISTENTLY FROM RUN TO RUN. AFTER CATCHING
ONTO THE STRENGTH OF THE SYSTEM THE GFS HAS SETTLED IN...SYNCING
WITH THE GEFS MEAN...WHEREAS SOME EARLIER RUNS HAD BEEN SLIGHTLY
FAST AND WEAK. THE WPC QPF AND WINTER WEATHER FORECASTERS
CAUTION...HOWEVER...THAT THE GFS PRECIPITATION OUTPUT LOOKS TOO
LIGHT. THEIR DAY 1 FORECASTS...IN PARTICULAR...WILL BE WEIGHTED
TOWARD THE HEAVIER AMOUNTS IN THE ECMWF AND UKMET.

THE 12Z ECMWF DISPLAYS VERY MUCH THE SAME STRENGTH AND TRACK AS
ITS PREVIOUS RUN...BUT IT TRENDED SLOWER. THIS TREND BECOMES MORE
APPARENT ON DAY 2 WHEN THE SYSTEM GETS INTO NEW ENGLAND. THERE IS
NOT A CORRESPONDING DEEPER OR MORE SHARPLY AMPLIFIED SOLUTION IN
THE ECMWF. THE OTHER SEMI-TRUSTED SOURCES FOR THIS STORM...UKMET
AND GEFS MEAN...DID NOT TREND SLOWER. SO WE PREFER NOT TO PUT TOO
MUCH WEIGHT ON THE TREND IN THE ECMWF...BUT WILL INCLUDE THAT
MODEL IN OUR PREFERENCE AS IT STILL DESCRIBES THE CHARACTER OF THE
EXPECTED STORM. THE UKMET NOW APPEARS SLIGHTLY FAST RELATIVE TO
THE ECMWF AND GEFS MEAN...SO WE REMOVE THE UKMET FROM OUR
PREFERENCE...BUT IT TOO MAY STILL HAVE UTILITY.

THE 12Z NAM IS SLOW TO DEEPEN THE SYSTEM BOTH AT THE SURFACE AND
ALOFT. THIS LIMITS THE POTENTIAL UTILITY OF THE NAM...BUT IT DOES
APPEAR TO CATCH UP ON DAY 2 WHEN THE SYSTEM REACHES NEW ENGLAND.
AT THAT TIME THE NAM DISPLAYS ITS TYPICAL BIAS OF HAVING THERMAL
FIELDS COLDER THAN CONSENSUS...BUT THE STRENGTH AND PLACEMENT OF
THE STORM MATCHES CONSENSUS.

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Both the GFS and Euro really like eastern Mass and the NH Seacoast for tomorrow's thump. Relatively little QPF over CT/W Mass with eastern areas cashing in. 

 

I don't have the ECMWF numbers but the GFS numbers look almost identical for BOS and BDL before 18z tomorrow:

 

http://wxweb.meteostar.com/sample/sample.shtml?text=Kbos

http://wxweb.meteostar.com/sample/sample.shtml?text=Kbdl

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Agree.  Wxbell and wunderground only work with a pure snow event.  But weenies love them.

or a 90% pure snow event in some areas. Beautiful front ender, models have varied in intensity placement and total QPF but overall sense is it lays a 6-10 carpet and then things shut off for a while before they crank up. Tremendous height falls, rapidly deepening LP, you know the drill. models are guidance rarely do they nail events of this magnitude in finite detail.

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12z Euro today will tell the tale..It doesn't really matter what any of the other models do..If that comes west we know the drill..if it ticks east again like 00z then good news for all

 

 

Dont you think it's a little dangerous to make your forecast off of 1 model? Usually you always preach to use all guidance and not put all eggs in one basket

 

:whistle:

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Here folks....newly pinned storm banter thread:

 

http://www.americanwx.com/bb/index.php/topic/42845-feb-13-14-storm-banter-thread/

 

 

 

Post in there for those that love to let their emotions spill out onto the keyboard in rapid succession of posts.

 

I could have hit the lottery, just dismounted from a supermodel and be getting 3 feet of snow Thursday and I couldn't rapid post anything.  This has been going on for weeks and it only gets worse with each storm.  If the site needs more money let's do it but it's less reliable as of late than the place that came before it and it's getting ridiculous.  /rant off but the primary purpose for many of us is to be able to discuss big events and lately that's becoming damn near impossible.

 

NAM appears to be a little slower with the digging energy - little flatter out in front this run through 12.

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Amazing to take a look down south and see the processes at play. Nothing like the '93 squall line/severe outbreak, but this is probably in the same league. Convection so far seems a bit deeper than anticipated close to the sfc low... think that has any influence on the track?

attachicon.gifFLradfeb12.gif

 

That's a fantastic loop....

 

NAM is quite a bit warmer to our SW through 18 hours. 

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I could have hit the lottery, just dismounted from a supermodel and be getting 3 feet of snow Thursday and I couldn't rapid post anything. This has been going on for weeks and it only gets worse with each storm. If the site needs more money let's do it but it's less reliable as of late than the place that came before it and it's getting ridiculous. /rant off but the primary purpose for many of us is to be able to discuss big events and lately that's becoming damn near impossible.

NAM appears to be a little slower with the digging energy - little flatter out in front this run through 12.

I have had no problem posting via the mobile site on a cellular network over the past few days. In fact, it would probably help out if myself and a bunch of others had more problems posting to limit the number of times we can post the same thing with different words, lol.
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