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12/19-12/20 threat


CoastalWx

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ugghhhh HPC tossing the Euro Op

REGARDING POTENTIAL IMPACTS...DUE TO THE BLOCKING PATTERN THE WEST

WILL LIKELY REMAIN UNDER THE INFLUENCE OF A SIGNIFICANT UPPER

TROUGH WHICH IS NOT EXPECTED TO MOVE APPRECIABLY AT ALL DURING THE

PERIOD. HOWEVER...WHILE THE MODEL DETAILS VARY

SUBSTANTIALLY...ESPECIALLY WITH THEIR QPF...THERE IS GENERAL

CONSENSUS THAT THE BASE OF THE TROUGH WILL SWING INTO THE WEST

AROUND DAYS 5 AND 6 ACCOMPANIED BY ADDITIONAL HEAVY PRECIPITATION.

WILL INCORPORATE AS MUCH DETAIL INTO THE MANUAL PROGS FOR THESE

DAYS...BUT WITH SUCH LARGE SOLUTION SPREAD...WILL LIKELY REMAIN

CLOSE THE GEFS OR ECMWF ENSEMBLE MEAN AND INCREASE AMPLITUDE WHERE

DETERMINISTIC GUIDANCE CLUSTERS MOST. A SIMILAR APPROACH APPLIES

IN THE EAST WHERE SOLUTION SPREAD IS ALSO WELL ABOVE

AVERAGE...WHICH MAKES ADDING MUCH DETAIL TO THE MANUAL PROGS A

MAJOR CHALLENGE WITHOUT INTRODUCING POTENTIAL ERROR. THE NEW ECMWF

HAS TRENDED NOTICEABLY FARTHER WEST WITH A MAJOR WINTER STORM

AFFECTING BOSTON BY DAYS 4/5. HOWEVER...WITH ITS NEARLY OUTLIER

SOLUTION OVER ONTARIO/SASKATCHEWAN POTENTIALLY NEGATIVELY

INFLUENCING THE UPPER LEVEL PATTERN OVER THE WESTERN

ATLANTIC...ITS SOLUTION IS CURRENTLY DISCARDED IN FAVOR OF THE

GEFS AND/OR ECMWF ENSEMBLE MEAN WHICH ARE FARTHER OUT TO SEA.

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I thought models are supposed to be getting more precise??? This is ridiculous and going to go down as one of the biggest head aches of any storm. I love the the fact that the Euro is in now, but I need another run of the Euro to verify and the GFS to come back. If those two happen, I am all in. When does the next Euro run come out? The NAM will be out in an hour or so.

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f96.gif

As you have already said, the 12z runs will see if this is a blip or will the rest of the globals correct westward. I think the answer lies somewhere int he middle and feel pretty confident, at least down by where I lie, for advisory level snows.

Forgive my ignorance. I assume this is the Euro everyone talks about; am I right? Then, if I look at this with no knowledge of doing so it looks like, according to all that green, that we will get smacked with snow with this storm. Is this what this is saying? What is the 90 (dark green) representative of?

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ugghhhh HPC tossing the Euro Op

REGARDING POTENTIAL IMPACTS...DUE TO THE BLOCKING PATTERN THE WEST

WILL LIKELY REMAIN UNDER THE INFLUENCE OF A SIGNIFICANT UPPER

TROUGH WHICH IS NOT EXPECTED TO MOVE APPRECIABLY AT ALL DURING THE

PERIOD. HOWEVER...WHILE THE MODEL DETAILS VARY

SUBSTANTIALLY...ESPECIALLY WITH THEIR QPF...THERE IS GENERAL

CONSENSUS THAT THE BASE OF THE TROUGH WILL SWING INTO THE WEST

AROUND DAYS 5 AND 6 ACCOMPANIED BY ADDITIONAL HEAVY PRECIPITATION.

WILL INCORPORATE AS MUCH DETAIL INTO THE MANUAL PROGS FOR THESE

DAYS...BUT WITH SUCH LARGE SOLUTION SPREAD...WILL LIKELY REMAIN

CLOSE THE GEFS OR ECMWF ENSEMBLE MEAN AND INCREASE AMPLITUDE WHERE

DETERMINISTIC GUIDANCE CLUSTERS MOST. A SIMILAR APPROACH APPLIES

IN THE EAST WHERE SOLUTION SPREAD IS ALSO WELL ABOVE

AVERAGE...WHICH MAKES ADDING MUCH DETAIL TO THE MANUAL PROGS A

MAJOR CHALLENGE WITHOUT INTRODUCING POTENTIAL ERROR. THE NEW ECMWF

HAS TRENDED NOTICEABLY FARTHER WEST WITH A MAJOR WINTER STORM

AFFECTING BOSTON BY DAYS 4/5. HOWEVER...WITH ITS NEARLY OUTLIER

SOLUTION OVER ONTARIO/SASKATCHEWAN POTENTIALLY NEGATIVELY

INFLUENCING THE UPPER LEVEL PATTERN OVER THE WESTERN

ATLANTIC...ITS SOLUTION IS CURRENTLY DISCARDED IN FAVOR OF THE

GEFS AND/OR ECMWF ENSEMBLE MEAN WHICH ARE FARTHER OUT TO SEA.

They were going for a snowstorm at 12z yesterday...

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ugghhhh HPC tossing the Euro Op

REGARDING POTENTIAL IMPACTS...DUE TO THE BLOCKING PATTERN THE WEST

WILL LIKELY REMAIN UNDER THE INFLUENCE OF A SIGNIFICANT UPPER

TROUGH WHICH IS NOT EXPECTED TO MOVE APPRECIABLY AT ALL DURING THE

PERIOD. HOWEVER...WHILE THE MODEL DETAILS VARY

SUBSTANTIALLY...ESPECIALLY WITH THEIR QPF...THERE IS GENERAL

CONSENSUS THAT THE BASE OF THE TROUGH WILL SWING INTO THE WEST

AROUND DAYS 5 AND 6 ACCOMPANIED BY ADDITIONAL HEAVY PRECIPITATION.

WILL INCORPORATE AS MUCH DETAIL INTO THE MANUAL PROGS FOR THESE

DAYS...BUT WITH SUCH LARGE SOLUTION SPREAD...WILL LIKELY REMAIN

CLOSE THE GEFS OR ECMWF ENSEMBLE MEAN AND INCREASE AMPLITUDE WHERE

DETERMINISTIC GUIDANCE CLUSTERS MOST. A SIMILAR APPROACH APPLIES

IN THE EAST WHERE SOLUTION SPREAD IS ALSO WELL ABOVE

AVERAGE...WHICH MAKES ADDING MUCH DETAIL TO THE MANUAL PROGS A

MAJOR CHALLENGE WITHOUT INTRODUCING POTENTIAL ERROR. THE NEW ECMWF

HAS TRENDED NOTICEABLY FARTHER WEST WITH A MAJOR WINTER STORM

AFFECTING BOSTON BY DAYS 4/5. HOWEVER...WITH ITS NEARLY OUTLIER

SOLUTION OVER ONTARIO/SASKATCHEWAN POTENTIALLY NEGATIVELY

INFLUENCING THE UPPER LEVEL PATTERN OVER THE WESTERN

ATLANTIC...ITS SOLUTION IS CURRENTLY DISCARDED IN FAVOR OF THE

GEFS AND/OR ECMWF ENSEMBLE MEAN WHICH ARE FARTHER OUT TO SEA.

Think c-o-n-t-i-n-u-i-t-y when reading anything from the HPC. They will never stray far from the previous discussion. Until there is further evidence to supports it's solution, it's a prudent way to go.

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I thought models are supposed to be getting more precise??? This is ridiculous and going to go down as one of the biggest head aches of any storm. I love the the fact that the Euro is in now, but I need another run of the Euro to verify and the GFS to come back. If those two happen, I am all in. When does the next Euro run come out? The NAM will be out in an hour or so.

Around 1 PM. Be here, you won't want to miss it.

And welcome. :)

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Forgive my ignorance. I assume this is the Euro everyone talks about; am I right? Then, if I look at this with no knowledge of doing so it looks like, according to all that green, that we will get smacked with snow with this storm. Is this what this is saying? What is the 90 (dark green) representative of?

Dark Green in the lower panels indicates high relative humidity at different parts of the atmosphere (700 mb and 850 mb) in this case I believe. It doesn't necessarily indicate that an area is getting "smacked with snow" but usually indicates where precip might be or where dry slots might occur. Mets correct me if I'm wrong...

I believe the precip maps that the models spit out are extrapolations from all this data regarding RH, Low placement, etc.

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Think c-o-n-t-i-n-u-i-t-y when reading anything from the HPC. They will never stray far from the previous discussion. Until there is further evidence to supports it's solution, it's a prudent way to go.

You can bet after 12z if the euro has the same solution as 00z, There final extended discussion is going to look a lot differnt then there preliminary....... :snowman:

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I am thinking for the sanity of a lot of people on this board, That the 12z runs today are probably the biggest runs of the winter so far for everyone............until the 00z tonight.... :snowman:

For me it all hinges on ECMWF. I do want to see other guidance trend to it, but that's not as critical as getting the Doc to stabilize and keep dropping the hammer on us.

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Discarding the EC 4.5 days out. Classic--don't see that happen very often, eh? They also discarded the EC's OTS run from yesterday, too IIRC.

They were very wrong yesterday. They're right today. No way should any met take the Euro with more than a grain of salt YET. Very little support from any other model runs, including its own. It would be careless of them not to throw out the 00z Euro, for now.

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