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Feb. 14-17th Clipper Systems


HillsdaleMIWeather

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At least it's giving us an advisory snow. Haven't seen that for awhile. Rather be on the northern side of the system, then the sharp southern cut off. It looks like a slight improvement from my standpoint/location. 3-4 members had me at 6" > on the 6z run, and this run it's about 8 members.

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WPC discussion

PROGRESSIVE SHORTWAVE PUSHING FROM THE PACIFIC NORTHWEST TO THE

GREAT LAKES...

FINAL PREFERENCE: BLEND OF THE 12Z GFS/ECMWF WITH THE 00Z ECMWF

ENSEMBLE MEAN

FORECAST CONFIDENCE: SLIGHTLY BELOW AVERAGE

UPPER RIDGING ACROSS THE WESTERN U.S. WILL BREAK DOWN IN RESPONSE

TO A PACIFIC SYSTEM WHICH WILL REACH THE WA BORDER BY EARLY

FRIDAY. THE 12Z NAM IS QUICKER TO ADVANCE THE LEADING EDGE OF

HEIGHT FALLS THROUGH THE PACIFIC NORTHWEST ON FRIDAY. TRAILING

ENERGY SPILLS IN ITS WAKE LEADING TO A MORE ELONGATED SYSTEM

STRETCHING ACROSS THE NORTHWESTERN TIER. WHILE FASTER WITH THE

INITIAL IMPULSE...THE OVERALL ADVANCE OF THE TROUGH ITSELF IS

SLOWER IN THE 12Z NAM WITH THE 12Z UKMET MOVING TOWARD THE MORE

AMPLIFIED SIDE. ENSEMBLE SPAGHETTIS SHOW SOME AMPLITUDE SPREAD

WITH MANY OF THE 00Z GEFS MEMBERS FAVORING MORE AMPLIFICATION

ACROSS THE CENTRAL PLAINS ON SUNDAY MORNING. HOWEVER...THE

ENSEMBLE MEAN ITSELF STAYS TO THE NORTH WHERE THE BETTER

CLUSTERING IS. THE OVERALL EVOLUTION OF THIS SYSTEM IS COMPLICATED

GIVEN THE NUMBER OF SHORTWAVES INVOLVED. THE BEST ENSEMBLE SUPPORT

NOTED IN RECENT SPAGHETTI DIAGRAMS IS FROM THE 00Z ECMWF ENSEMBLE

MEAN. WPC FAVORS A BLEND OF THE 12Z GFS/ECMWF WITH INCLUSION OF

THE 00Z ECMWF ENSEMBLE MEAN TO ACCOUNT FOR GROWING UNCERTAINTIES

The GFS has consistency on its side, the GEM trended closer to it and the Euro is in lala land

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