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December 16th-17th GL Clipper


Powerball

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Huh. Nothing in my forecast, and their afd only mentions "an inch or two"

 

I had 1-3" in my point and click earlier, now it shows mostly cloudy with no snow. I completely disagree with the no snow for Monday night. All models have the clipper tracking through here overnight.

 

Their snow map forecast also disagrees with their point and click/zone forecasts:

 

 

SnowAmt12hr_7.png

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I think that's what usually happens around here? We never see snowfall fall on top of snowfall. Since I moved from Germany in 1999 to Detroit, I don't ever recall having a significant snowfall on the ground and another significant snowfall  to fall on top (except we do get clippers) ...However I do  know that we get a pretty good snowfall and several days later it rains, washes away the snow, new one falls, etc....

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Before this clipper happens, 700mb temps will drop to -30C above Lake Superior tomorrow night. Just think, this will be a 30-32C temperature differential between the lake water and 700mb.  (35F - (-22F) ) = 57F temperature difference. This could briefly create some of the most impressive LES clouds over the water.

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There's also another weaker clipper moving through Iowa into Illinois tomorrow and tomorrow night.  Looks to drop a dusting to perhaps an inch of high ratio powder along it's track.  As it stands now we could get a half inch or so from that and maybe another half inch with the second clipper.  Penny and nickeling our way to a decent month.

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Didn't even see that Clipper Cyclone! The second one is hands down stronger.

Looks like you could pick up at least an inch from both. Ratios will probably be 20:1.

 

 

West of Detroit is basically the result of the Clipper. East of Detroit is where the departing system snow is still being shown.

 

cmc_total_precip_east_13.png

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good discussion from LOT

 

MONDAY...THE CLIPPER CURRENTLY OVER ALBERTA WILL BE THE MAIN  
CHALLENGE FOR MONDAY. BASICALLY THE MAIN CONCERN IS THAT THERE WILL  
BE A SHORT PERIOD OF FAIRLY HIGH RATE/HIGH RATIO SNOW DURING THE  
LATE AFTERNOON ACROSS NORTHERN PORTIONS OF THE AREA. THE MAIN  
CHALLENGE IS HOW FAR SOUTH THIS COULD OCCUR. THE MAIN IMPLICATIONS  
ARE THAT A QUICK 1 OR EVEN 2 INCHES OF SNOW COULD FALL DURING THE  
AFTERNOON WHICH COULD CAUSE TRAVEL PROBLEMS FOR THE AFTERNOON  
RUSH...MAINLY ACROSS THE CHICAGO METRO BASED ON TIMING. GUIDANCE HAS  
SHOWN A RANGE OF SOLUTIONS WITH THIS SYSTEM UP UNTIL THIS POINT BUT  
HAS BEEN COMING INTO BETTER AGREEMENT ON TRACKING FORCING FURTHER  
SOUTH.
LATEST GUIDANCE LOOKS TO HAVE A GOOD HANDLE ON THE UPPER  
CIRCULATION/VORT MAX OBSERVED OVER EAST-CENTRAL ALBERTA AT THE  
CURRENT TIME. TRAJECTORIES BRING THIS TO THE NORTHERN CWA MONDAY  
AFTERNOON SUPPORTING THE TRENDS OF MOST OF THE LATEST GUIDANCE. ONCE  
THE WAVE ARRIVES...MID LEVEL UPWARD FORCING EXTENDS THROUGH THE  
FAVORED SNOW GROWTH ZONE...THOUGH IT MAY BE CENTERED TOWARD THE  
WARMER SIDE OR JUST BELOW...FOR A SHORT TIME DURING THE AFTERNOON  
BEFORE QUICKLY EXITING. THE MAIN UPPER TROUGH AND ASSOCIATED  
SURFACE LOW...WHICH WILL BE TRACKING NORTH OF THE AREA...STRENGTHEN  
AS THE SYSTEM PROGRESSES WITH POTENTIAL VORTICITY PLOTS SHOWING A  
PRONOUNCED SURGE ACROSS SOUTHERN LAKE MICHIGAN AS THE NOSE OF A  
110+KT UPPER JET MOVES IN FROM THE NORTHWEST. WILL GO AHEAD AND  
INCREASE POPS AND SPREAD THEM SOUTHWARD ACROSS MORE OF THE AREA. THE  
LARGEST INCREASE WILL BE ALONG AND NORTH OF A ROCKFORD TO SOUTHERN  
CHICAGO METRO TO VALPARAISO LINE WITH HIGH CHANCE TO LIKELY  
POPS...WITH THE HIGHEST VALUES CLOSER TO THE WI BORDER. POTENTIAL  
LIQUID EQUIVALENT PRECIP FOR THESE NORTHERN AREAS LOOKS TO BE IN THE  
0.05 TO AROUND 0.1 INCH RANGE NORTH OF THE ROCKFORD TO VALPARAISO  
LINE WITH EXPECTED SNOW RATIOS OF APPROX 16-18:1...WHICH COULD EVEN  
BE A BIT LOW. THIS YIELDS HIGHEST AMOUNTS OF AROUND 1 INCH WITH 2  
INCHES POSSIBLE CLOSE TO THE WI BORDER...WHILE AMOUNTS QUICKLY DROP  
OFF SOUTH OF THE MAIN SNOW AREA. CONSIDERING THE ALIGNMENT OF  
FORCING/MOISTURE/SNOW GROWTH MENTIONED ABOVE ACCUMULATION RATES OF  
0.5-0.75 IN/HR ARE POSSIBLE DURING THIS 2-4 HOUR WINDOW DURING THE  
AFTERNOON.
THE HEAVIEST WOULD LIKELY WIND DOWN BY THE EVENING  
ROCKFORD COMMUTE BUT ARRIVE JUST IN TIME FOR THE CHICAGO EVENING  
COMMUTE. HAVE DECENT CONFIDENCE IN THIS OVERALL SCENARIO WITH LOWEST  
CONFIDENCE IN HOW FAR SOUTH THE HIGHEST AMOUNTS WILL STRETCH GIVEN  
THE VARIATION WE HAVE SEEN IN RECENT GUIDANCE. CONFIDENCE COULD BE  
HIGHER BUT HAVE ENOUGH TO TAKE THE FORECAST IN THIS DIRECTION.  
 

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