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February 12-13 Storm, Part II


stormtracker

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The beauty of this run is that we don't even flirt with a mix. The worst temp news is that the surface goes to 34 Thurs afternoon so we get some dripping.

Best storm ever if we get dumped on and it all melts right away after. ;) 

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Shift this 50 miles NW, thats where the NAM will be come 12z tomorrow IMO. Amazing run though. However, the way it actually depicts the storm makes a lot more sense to me compared to the GGEM/GFS with their weird light CCB snows.. 

 

That would basically put it in line with the Euro. No one can complain about this run though. With the bands that will be moving through everyone will get their share. It is really just a perfect run.

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Still not running to the Euro at least... which keeps it sort of lonely on the western edge. 

 

It's really cool looking at the different solutions and the comma head of destruction and then comparing it the when/where H5 closes off. 

 

12z gfs is definitely changing @ 18z imo. Here's the only closed panel and it came latest @ 7pm Thurdsay

 

post-2035-0-94873100-1392065563_thumb.jp

 

 

Euro is by far the earliest and furthest west (1am thurs)

 

post-2035-0-41826700-1392065608_thumb.jp

 

 

GGEM is a great solution. Thurs @ 1pm

 

post-2035-0-37458800-1392065637_thumb.jp

 

 

And then the 18z nam. Closes off @ 1pm Thurs (pic is mislabeled)

 

post-2035-0-97734800-1392065709_thumb.jp

 

 

 

We won't know who gets destroyed and when until h5 is nailed down. It may not happen until nowcast time too. Way cool. This is like Vort301 and stuff. 

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It's really cool looking at the different solutions and the comma head of destruction and then comparing it the when/where H5 closes off. 

 

12z gfs is definitely changing @ 18z imo. Here's the only closed panel and it came latest @ 7pm Thurdsay

 

attachicon.gif12zgfs7pmthurs.JPG

 

 

Euro is by far the earliest and furthest west (1am thurs)

 

attachicon.gifEuro1amThurs.JPG

 

 

GGEM is a great solution. Thurs @ 1pm

 

attachicon.gifGGEM1pmThurs.JPG

 

 

And then the 18z nam. Closes off @ 1pm Thurs (pic is mislabeled)

 

attachicon.gif18zNam1pmWed.JPG

 

 

 

We won't know who gets destroyed and when until h5 is nailed down. It may not happen until nowcast time too. Way cool. This is like Vort301 and stuff. 

Exactly.   How quickly the 500 closes off is the key.  

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Good comparo Bob. I agree the NAM is unlikely to win the battle at this range verbatim.  I guess I just don't see the pt in getting into the weeds on mix etc given that we're still seeing every possible solution there from no mix to lots of mix.  I expect to mix for a time I suppose but other than that I wouldn't go far either way there.  Someday soon mets won't be needed if we just rip the Euro verbatim and run. 

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Interesting that the HPC prefers a blend NAM/GFS/UKMET over the Euro right now.

 

 

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

PREFERENCE: BLEND OF 12Z NAM/GFS/UKMET
CONFIDENCE: AVERAGE

ON THE LARGE SCALE A SIGNIFICANT WINTER STORM CERTAINLY APPEARS IN
ALL OF THE OPERATIONAL MODELS. PRECIPITATION IS FOCUSED INITIALLY
ALONG A MID LEVEL FRONTAL ZONE ORIENTED WEST TO EAST. LOW PRESSURE
THEN DEVELOPS ALONG THE GULF COAST BY WEDNESDAY MORNING AND TRACKS
TO JUST OFFSHORE OF THE MID ATLANTIC/DELMARVA TO NEW JERSEY BY
THURSDAY AFTERNOON. ALL OF THE OPERATIONAL SOLUTIONS ARE
PLAUSIBLE...BUT THERE ARE VERY MEANINGFUL STRENGTH/TRACK
DIFFERENCES. OUR PREFERENCE IS BASED ON TRENDS IN SOME OF THE
TIMING/STRENGTH/TRACK DETAILS. THE PAST TWO RUNS OF THE ECMWF HAVE
BEEN ON THE WEST SIDE OF THE TRACK ENVELOPE WHILE ALSO BEING VERY
STRONGLY DEVELOPED WITH THE SURFACE LOW. THE OPERATIONAL MODEL
CONSENSUS IS TOWARD A LOW TRACK THAT IS MORE SUPPRESSED TO THE
SOUTH ACROSS GEORGIA AND ADJACENT STATES ON DAY 2...AND THEN
FARTHER EAST...SLIGHTLY OFFSHORE ON DAY 3. GIVEN THAT THE PARENT
UPPER WAVE IS INITIALLY OF VERY LOW AMPLITUDE AND EMBEDDED IN FAST
ZONAL FLOW...WE PREFER THE NON-ECMWF CONSENSUS. WE OMITTED THE
CANADIAN FROM THIS CONSENSUS AS ITS SOLUTION IS SLIGHTLY FAST.

THE NAM/GFS ARE LIKELY NOT PERFECT...BUT THEY HAVE TRENDED TOWARD
THE ENSEMBLE MEANS...ESPECIALLY FOR TRACK AND TIMING. IT IS WORTH
NOTING THAT THERE IS EVIDENCE FROM MULTIPLE RUNS OF THE ECMWF AND
THE LATEST UKMET...AS WELL AS SEVERAL 12Z GEFS MEMBERS...THAT THE
LOW LEVEL CYCLONE MAY DROP DEEPER THAN THE NAM/GFS SOLUTIONS BY
14/00Z.

AN IMPORTANT NORTHERN STREAM SHORTWAVE HAD NOT YET COME ASHORE
INTO BRITISH COLUMBIA THIS MORNING...SO SOME MARKED TRENDS MAY BE
YET TO COME. THE 12Z NAM/GFS/UKMET...HOWEVER...ARE CONSISTENT WITH
THE CURRENT TRENDS AND ENSEMBLE MEANS...WHICH GIVES US SOME
CONFIDENCE IN RECOMMENDING THEM.

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