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March 4-6 Potential Winter Storm


Chicago WX

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IWX

GREATER PERIOD OF CONCERN LIES STARTING FRI NGT AND INTO MUCH OF THE UPCOMING WEEKEND. NEW RUNS OF THE GFS HAVE BEGUN TO TREND A BIT MORE SE TOWARDS THE PREV ECMWF SOLUTION. THIS STILL WILL RESULT IN A INCREASINGLY LIKELY CHANCE FOR RAIN AND POSSIBLY SOME THUNDER FRI NGT INTO SATURDAY AS FIRST WAVE MOVES ACROSS THE FORECAST AREA. HAVE EXPANDED LIKELY POPS TO ALL DAY SATURDAY DURING MOST FAVORABLE TIME OF RAINFALL FOR THE AREA. QPF AMOUNTS COULD BE ON THE HIGHER SIDE AGAIN...THREE QUARTERS OF AN INCH TO MORE THAN AN INCH AND A HALF AGAIN. SOME INDICATIONS THIS COULD OCCUR MORE OVER NW PARTS OF THE AREA WHERE RIVERS MAY BE ABLE TO TAKE JUST A BIT MORE. RIGHT NOW NOT GETTING FANCY WITH TRENDS WITH ADDITIONAL HYDRO ISSUES LIKELY.

GFS CONTINUES WITH A PROGRESSIVE TREND OF THE SYSTEM WITH ALL PRECIP CUTTING OFF BY SAT NGT. ECMWF AND GEM LEAN AGAINST WITH 500 TROUGH DIGGING AND BECOMING NEGATIVELY TILTED. ANOTHER LOW WILL DEVELOP IN RESPONSE TO THE DIGGING TROUGH AND UPPER LEVEL ENERGY. THIS LOW MAY HAVE A FURTHER SOUTHEAST TRACK WITH COLDER AIR MOVING IN ON THE NORTH SIDE OF IT. IF THIS WERE TO COME TOGETHER...A DEFORMATION BAND OF SNOW COULD TAKE SHAPE FOR SAT NGT INTO SUNDAY BRINGING MORE ISSUES. NO CHANGES MADE OTHER THAN TO INCREASE POPS TO HIGH CHC SAT NGT AND INTRODUCE LOW CHC POPS SUNDAY. CHANGES ARE LIKELY OVER THE NEXT COUPLE OF DAYS AS MODELS HOPEFULLY GET A BETTER HANDLE ON THE SETUP.

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Adjust your bookmarks accordingly.

This site is scheduled to be decommissioned

on April 5th 2011. Please bookmark the new

Model Analyses and Guidance

Web site which replaces it.

Out with the old: http://www.nco.ncep....wprod/analysis/

In with the new: http://mag.ncep.noaa...B/appcontroller

End of an era. I think that incarnation of the NCEP model page has been going since the GFS became operational in the fall of 2002. How time flies.

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End of an era. I think that incarnation of the NCEP model page has been going since the GFS became operational in the fall of 2002. How time flies.

I could be wrong, but I think that page has been around since at least December 2000...at least for me because that's when I first found computer weather models. Of course that was back in the ETA and AVN days, and the NGM had some legitimacy.

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I could be wrong, but I think that page has been around since at least December 2000...at least for me because that's when I first found computer weather models. Of course that was back in the ETA and AVN days, and the NGM had some legitimacy.

Maybe. I remember during the Jan 31, 2002 storm I was looking at the AVN through a webpage that was a vertically divided split-screen, with a toolbar on the left side comprising maybe 1/4 of the screen, and the maps on the right side comprising 3/4. It was definitely NCEP, but maybe it was something experimental.

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DTX

THE PSEUDO ZONAL FLOW OVER NORTH AMERICA ON FRIDAY LOOKS TO BE

UNDERGOING AMPLIFICATION AS WE HEAD INTO THE WEEKEND...WITH EVENTUAL

PHASING OFF THE NORTHERN AND SOUTHERN BRANCHES. WHETHER WE END UP

WITH ONE LARGE STORM...OR A SERIES OF LOWS REMAINS TO BE SEEN.

12Z GFS AND MAJORITY OF ENSEMBLE MEMBERS INDICATE MAIN LOW TRACKING

THROUGH OR WEST OF SOUTHEAST MICHIGAN LATE SATURDAY...SUGGESTING

WE ARE LOOKING MOSTLY AT HEAVY RAIN THREAT FOR THE FIRST HALF OF

THE WEEKEND. THE 12Z EUROPEAN HOWEVER...INDICATING A FLATTER

WAVE/COLD FRONT MOVING THROUGH THE FIRST HALF OF THE

WEEKEND...WITH MORE SIGNIFICANT SECOND LOW PRESSURE SYSTEM

ADVANCING INTO THE SOUTHERN/EASTERN OHIO VALLEY...PLACING

SOUTHEAST MICHIGAN IN FAVORABLE SPOT FOR ACCUMULATING DEFORMATION

SNOW FOR THE SECOND HALF OF THE WEEKEND...WITH JUST ENOUGH COLD

AIR IN PLACE OR FEEDING IN. EVEN SO...STILL NOT ENOUGH CONFIDENCE

TO CARRY MORE THAN HIGH CHANCE THIS FAR OUT...SEE WEAKER AND FARTHER

EAST SOLUTION OF THE 12Z UKMET. DRY AND SEASONABLY COLD CONDITIONS

EXPECTED TO FOLLOW FOR EARLY NEXT WEEK.

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Maybe. I remember during the Jan 31, 2002 storm I was looking at the AVN through a webpage that was a vertically divided split-screen, with a toolbar on the left side comprising maybe 1/4 of the screen, and the maps on the right side comprising 3/4. It was definitely NCEP, but maybe it was something experimental.

I know what you're talking about I think. That site was a bit of a cluster **** at times if I recall correctly. I'll have to give the new site a try soon, might as well get used to it. Even with better options out there today, I still use the NCEP site for some reason.

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pretty big differences between this run of the NAM and the 12z run. The northern stream s/w that kicks out from the base of the big cyclone spinning its way off the coast of BC is much weaker this run as it comes onshore into the pac northwest and moves across the Canada/MT border and moves it east. The 12z run is much stronger with this feature and phases it into more of a longwave between it and the southern stream s/w with the one were watching in the TX PH and 84hrs on the 12z NAM.

12z

18z

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