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December 20-22 Winter Storm (Blizzard?) Potential


Hoosier

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I'd sure like to see a bump SE on the gfs, but the euro models holding makes me feel good.

This is a system where you don't want to nws be on the SE half of the heavy snow band being progged. Id feel a lot better if I were in cedar rapids and dubuque. We might do okay here though as this baby winds up.

I 'm cautiously optimistic on this.

Both the Euro and Ukie sure give us a good thumping after some rain early on. I think the smart way to go at this point is to take a blend of Euro/Ukie/GFS, which would still give us a few inches on the tail-end. In any case the QC should finally get the first accumulating snow of the season.

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Some of the heaviest, wettest snow/slush Bowme and I could ever want on the Euro; with 850 temps well below 0C, but surface temps between 0 and 2C most of the time, what percentage of that would probably fall as snow? I'm thinking maybe half, and it would be low ratio stuff at that. Slow it down or speed it up so more of it would fall overnight, not that time of day really matters on the second shortest day of the year.

Put the NAM characteristics into a EURO track - now that would be awesome!

I'm going to guess 3/4 will be snow for 5+ miles inland Probably 8:1 to start going to 10:1 towards mid afternoon. (for around Milwaukee)

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Not to be obsessed with the wind potential at this point but I went back and looked at some classic high wind makers and couldn't find many that had 925 mb winds of 60 kts in the CCB as the GFS is indicating for parts of the southern Lakes, which means a couple things: 1) the GFS could be a bit too extreme, 2) if it's not too extreme, then rather rare/unique impacts may be expected. Hopefully the offices will start hitting this threat more if it looks like the higher end solution may pan out.

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A little surprised that LSE and MKE went with watches so soon (54+hrs out). It'll be interesting to see if OMA/DMX/DVN follow suit.

Looking at the Euro a little closer, it would indicate the QC transitioning over to all snow by just before 12z Thu. The western and northern portion of the DVN area look like they stay all snow through the whole event.

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I will take my couple of inches of slop and 50+mph winds...better than nothing.

BTW this was mentioned in the MKX morning afd.

CIPS ANALOGS CONTINUE TO SHOW MEAN SNOWFALL OF 4 TO 8" IN THIS

AREA BUT WITH 12+" PROBABILITIES RUNNING IN 30% RANGE. THEY ALSO

HAVE 60-70% PROBABILITY OF WIND GUSTS OVER 30 KNOTS...SO BLOWING

SNOW AND PERHAPS BLIZZARD CONDITIONS COULD RESULT ESPECIALLY IF

GEMNH AND ECMWF SOLUTIONS PAN OUT. MADE SURE TO BEEF UP THE WIND

GUSTS AND NOW HAVE GUSTS IN 30 TO 35 KNOT RANGE ON THURSDAY.

QEPV ON GFS SHOWS STRONG POTENTIAL FOR THUNDERSNOW WITH THIS AND

EVEN HAS BAND OF NEGATIVE SHOWALTERS MOVING INTO SOUTHEAST

WISCONSIN. STRONG MID LEVEL DEEPENING INDICATES POTENTIAL FOR

NARROW BAND OF CONVECTIVE SNOWS THAT COULD AFFECT AREAS CLOSER TO

LAKE MICHIGAN LATE IN THE GAME.

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I will take my couple of inches of slop and 50+mph winds...better than nothing.

BTW this was mentioned in the MKX morning afd.

CIPS ANALOGS CONTINUE TO SHOW MEAN SNOWFALL OF 4 TO 8" IN THIS

AREA BUT WITH 12+" PROBABILITIES RUNNING IN 30% RANGE. THEY ALSO

HAVE 60-70% PROBABILITY OF WIND GUSTS OVER 30 KNOTS...SO BLOWING

SNOW AND PERHAPS BLIZZARD CONDITIONS COULD RESULT ESPECIALLY IF

GEMNH AND ECMWF SOLUTIONS PAN OUT. MADE SURE TO BEEF UP THE WIND

GUSTS AND NOW HAVE GUSTS IN 30 TO 35 KNOT RANGE ON THURSDAY.

QEPV ON GFS SHOWS STRONG POTENTIAL FOR THUNDERSNOW WITH THIS AND

EVEN HAS BAND OF NEGATIVE SHOWALTERS MOVING INTO SOUTHEAST

WISCONSIN. STRONG MID LEVEL DEEPENING INDICATES POTENTIAL FOR

NARROW BAND OF CONVECTIVE SNOWS THAT COULD AFFECT AREAS CLOSER TO

LAKE MICHIGAN LATE IN THE GAME.

Maybe we can crank out some lake enhancement thunder snow at the end! That would be epic! haha

My forecast has a mix turning over to all snow early afternoon.

Edit" It will be like a DQ Concrete mixer closer to the lake!

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Maybe we can crank out some lake enhancement thunder snow at the end! That would be epic! haha

My forecast has a mix turning over to all snow early afternoon.

Edit" It will be like a DQ Concrete mixer closer to the lake!

winds are N to NW by the time we cool enough at 850 anyways...the lake really won't matter

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Just looked over the 3 hour maps for the 12z NAM and GFS, and they're pretty close to identical in track. 12z GGEM is about the same until it diverts once it reaches Lake Michigan, where it takes a more easterly track than the other two. The Euro of course, is on its own.

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