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February 4 - 5 Clipper Discussion and Observations


NEG NAO

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:facepalm:

you look like you have one of those bugs thats going around - flu - cold or stomach virus - or is it the 12/13 winter blues ? this winter so far would make anyone sick - anyhow forecasts for this event range from a coating to an inchor 2

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and the NAM always overdoes precip amounts so slice those amounts in half....coating to an inch with some one getting lucky with 1.5

In this situation no. It's not a wrap up costal low. It has done very well with qpf in Midwest. This has better ratios and snow growth at 700

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MT HOLLY.

THIS SIGNAL IS WEAK AND NEW TO THE

GAME. WE`VE LOOKED AT TWO OR THREE RUNS OF THE ECMWF, GFS AND NAM

NOW, AND OUR SNOWFALL FORECAST FOR TUESDAY NIGHT THAT IS BASED ON

THIS OPERATIONAL ENSEMBLE CHANGES VERY LITTLE FROM THAT OF THE

PREVIOUS FORECASTER. WE CONTINUE TO FORECAST A SUB-ADVISORY EVENT.

THE OBVIOUS CAVEAT IS THAT IF THE WEAK SIGNAL IN THE NORTHWEST GETS

STRONGER OVER SUBSEQUENT RUNS, THEN A TICK UPWARD IN QPF AND RATIOS

THERE WOULD LEAD TO A REQUISITE UPTICK IN SNOWFALL AMOUNTS. THE

SOUNDINGS ARE PRETTY CHILLY FAR NORTHWEST, ALTHOUGH THE WINDS IN THE

SNOW GROWTH REGION LOOK TO BE AROUND 40 KT. IF WE START TO SEE GOOD

OMEGA IN THE SNOW GROWTH REGION WITH A CLEAR SIGNAL OF STEADY OR

FALLING THETA E VALUES WITH HEIGHT, THEN RATIOS NORTHWEST STILL

COULD SURPASS 20 TO 1. COMBINED WITH INCREASED QPF, WE WOULD BE

PUSHING INTO ADVISORY TERRITORY THERE.

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