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December 20-22 Winter Storm (Blizzard?) Potential


Hoosier

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Still time to iron out specifics but if the models stay consistent with the idea of the wave becoming negatively tilted as it approaches the Mississippi River, then I think the farther west solutions (Chicago or west for the surface low) become more likely unless it's at a latitude much farther south than currently shown. Been burned before with setups like this where the low hooks farther left than what you'd think. Besides that, there's always the concern about WAA being underdone even if the track is modeled correctly so I'd be very nervous wherever the southeast edge of the snow band sets up.

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To be fair, looking at just the OP GFS run does not say much anyway. If the ensemble mean shifts NW, along with the Euro Ensemble mean, that would tell me more.

We're close enough that op runs have value here. Facts are the Euro is on the eastern edge...which is kinda strange typically. Regardless, the GFS has seemed to be the middle road solution, which isn't a bad way to go at this point.

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12z GFS doesn't look any different to me over the 6z runs. Low passes directly overhead.

At least early this morning the DVN office is riding the EURO solution still.

LOOKING AT THESE ISSUES...THE OPERATIONAL GFS IS A FASTER AND MORE

MILD SOLUTION...LAYING JUST NORTHWEST OF THE ECMWF SURFACE LOW

TRACK. IT HAS WAVERED ON ITS TRACK NEARLY EVERY RUN BY 50 MILES OR

SO...LEAVING OUR CWA IN A SNOW/MIX WITH RAIN ALL WEDNESDAY NIGHT IN

THE EAST HALF...OR ALL SNOW DEPENDING ON THE RUNS THE PAST 24 HOURS.

THE NAM IS NOT USED SINCE THE WAVE IN QUESTION CAUSING THE STORM IS

WELL OUTSIDE ITS DOMAIN. THE 00Z UKMET IS NEAR THE OPERATIONAL GFS

TRACK...WITH THE CANADIAN MODEL/GEM LAYING JUST SOUTHEAST OF THE

GFS TRACK. THUS RATHER TIGHT CLUSTERING IS SEEN IN THESE OPERATIONAL

MODELS. THE ECMWF IS FARTHER SOUTH...AND HAS BEEN REMARKABLY

CONSISTENT THE PAST 48 HOURS OF MODEL RUNS CONCERNING THIS STORM. IT

ALONE IS FORECASTING THE ENTIRE CWA TO BE ALL SNOW THROUGH THE

ENTIRE EVENT...AS IT ALSO HAS A SLOWER ONSET OF SNOW WEDNESDAY

EVENING COMPARED TO THE MUCH MORE AGGRESSIVE DOMESTIC MODELS. THIS

CONSISTENCY LEADS ONE TO STRONGLY CONSIDER IT THE BEST MODEL IN

ADDITION TO THAT THE STORM IN QUESTION IS OVER THE PACIFIC OCEAN AT

THIS TIME...AND IS CERTAINLY IN THE WHEELHOUSE OF WHAT THE ECMWF

DOES BEST. A LOOK AT ENSEMBLE GFS MEMBERS SHOW THAT THE OPERATIONAL

GFS IS ON THE LEFT SIDE OF THE ENSEMBLE MEMBERS...THUS THERE IS

AGAIN SUPPORT FOR A MORE SOUTHERLY...BY 50 TO 80 MILES...PATH

COMPARED TO THE 00Z OPERATIONAL GFS.

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Good grief, the 12z GFS has sustained surface winds in excess of 40 kts at MKE at 00z Friday. This isn't even with onshore flow...the flow is offshore at that point and it's still that strong. Very impressive.

Well maybe in that scenario we could reach blizzard thresholds if the snow lasts at least 3 hours in tangent with those kind of winds.

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American models certainly trending towards a traditional Omaha/Rochester/Wausau hit. Love the fact this storm is bombing away as it heads into the lakes. Keeps the storm moving at a slower pace, and also adds very strong winds to the mix. Certainly looks like up to 10" could fall in the main band, with even more up in Wisconsin.

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Good grief, the 12z GFS has sustained surface winds in excess of 40 kts at MKE at 00z Friday. This isn't even with onshore flow...the flow is offshore at that point and it's still that strong. Very impressive.

Very impressive. Shows 60mph gust potential at MKE and surrounding areas. Also a large area of 50mph gust potential. With falling snow in some of those areas that should be very dramatic.

wind2.jpg

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Very impressive. Shows 60mph gust potential at MKE and surrounding areas. Also a large area of 50mph gust potential. With falling snow in some of those areas that should be very dramatic.

wind2.jpg

If anything, that product looks a little underdone. Momentum transfer progs would support some gusts up to 70 mph around MKE and possibly into northeastern IL.

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