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January 22-27th Clippers/Hybrids


Chicago Storm

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A POWERFUL SHORTWAVE WILL

BE CHARGING IN OUR DIRECTION VIA NORTHERN ONTARIO. THIS WILL TIGHTEN

UP THE PRESSURE GRADIENT AT ALL LEVELS AND RESULT IN A RAMPING UP OF

OUR SFC WINDS AS WE PROGRESS THROUGH THE DAY.

THE VERY DYNAMIC SHORTWAVE WILL PLOW SOUTH ACROSS THE UPPER GREAT

LAKES FRIDAY NIGHT...WITH ITS 1.5 PV SFC DIGGING DOWN TO AS LOW AS

750MB. AT THE SFC...A VERY STRONG WAVE WILL DEVELOP ALONG THE

LEADING EDGE OF THE NEXT ARCTIC FRONT. AS THE FRONT RUSHES ACROSS

LAKE SUPERIOR...THE SUB 985MB LOW WILL TAKE SHAPE IN THE VCNTY OF

GEORGIAN BAY...FURTHER SHARPENING THE PRESSURE GRADIENT OVER THE

LOWER LAKES AND OUR FORECAST AREA. THE FLOW MAY BE TOO SOUTHERLY TO

PROMOTE FUNNELING UP THE LENGTH OF LK ERIE...BUT IT WILL BE QUITE

WINDY NONETHELESS. BUFKIT PROFILES OF BOTH THE NAM AND GFS DEPICT A

CORE OF 50 TO 55KT WINDS AS LOW AS 1500 FT ACROSS THE WESTERN

COUNTIES. THESE WINDS WILL BE NEAR/BELOW THE INVERSION...SO THERE

WILL BE A DISTINCT THREAT FOR HIGH WINDS TO REACH THE SFC OVERNIGHT.

DO NOT YET HAVE THE CONFIDENCE FOR A HIGH WIND WATCH...BUT AM

GETTING CLOSE.

SNOW SHOWERS WILL BREAK OUT AHEAD OF THE APPROACHING ARCTIC FRONT...

AND PENDING THE SPEED OF THE FRONT...THERE COULD BE A PERIOD WHERE

BLIZZARD CONDITIONS WILL BE IN PLACE OVER THE WESTERN COUNTIES.

SINCE THERE IS STILL TOO MUCH UNCERTAINTY AS TO THE AMOUNT OF

WIND...AND IT DOES NOT APPEAR THAT WE WILL GET ENOUGH SNOW TO

WARRANT A WINTER STORM WATCH...WILL JUST ADDRESS THE OVERALL

SCENARIO IN THE HWO...INCLUDING THE POTENTIAL FOR NEAR BLIZZARD

CONDITIONS.

THE DEEPENING SFC LOW WILL LIFT TO SOUTHERN QUEBEC ON SATURDAY WHILE

SWEEPING ITS STRONG COLD FRONTAL BOUNDARY OVER OUR FORECAST AREA. IT

WILL NOT BE THE DAY TO TRAVEL ACROSS THE REGION AS STRONG WINDS AND

WIDESPREAD SNOW SHOWERS WILL BE COMMON. STAY TUNED TO POSSIBLE

WINTER STORM OR HIGH WIND WATCHES IN UPCOMING PACKAGES.

-NWS BUF.

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Tough to get much accumulation with a SW wind. Although the dynamics look like they may be strong enough to combat the downsloping a bit.

NAM really illustrates this point well. I have found that in past events it tend's to overdo the extent of the downsloping across the area, especially with a SW wind. Would help if the low tracked further north and we got into more of a westerly flow.

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NAM really illustrates this point well. I have found that in past events it tend's to overdo the extent of the downsloping across the area, especially with a SW wind. Would help if the low tracked further north and we got into more of a westerly flow.

attachicon.gifnam_pr3_slp_t850_ne_25.png

 

Even the lower res GFS shows the downsloping, with less precision. I'm rooting for more of a S-SSW wind, which is off Lk Ontario. Not enough fetch for enhancement but at least we don't get it blowing down the escarpment. 

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It is all the snow from the runways, I am 100% serious, it isn't going to melt until June, especially if we keep going the way we have.

The weird thing is the top layer of the pile is rock hard but inside there are regions of softer more manageable snow. The bottom where the asphalt sits usually consists of 4-5" of super hard ice which wicks the cold from the surrounding asphalt. This stuff will not move no matter the down pressure of the loader. To get it to release you have to pour a inch thick ribbon of salt on the ice, wait a few days at return with the machine to pry it off the surface.

If the runways of the airport are concrete the pile will be there forever. As the pile melts the crumbs of the surface layer of the plowed surface will raise to the surface and help radiate the suns energy into the top layer and speed up the process. This is holds true even more on older asphalt ....

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12z NAM probably not done with some weenie runs for the Friday night/Saturday impulse/front. And it'll be too bullish until the end. But yeah, drops 0.27" LE on LAF.

 

No matter, I still think it's got potential for some relatively high impact stuff with the snow/wind combo...even if totals are only 1-2". Good luck measuring it though.

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Why?

 

The deep vortex that causes the Friday-Saturday clipper is going to be spinning over QC just as the next s/w (the Sunday-Monday clipper) is diving around its backside. In that scenario, there's not going to be enough wavelength for the latter s/w to amplify. A flatter, more southerly wave is the way to go.

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12z GFS not as amped for the Friday night/Saturday stuff...and thus the next one gonna come north. 0z Euro FTW?

 

I think it'll come down to how much of the vortex retrogrades to the west and phases with the 2nd s/w. If there's not perfect symbiosis, the 2nd wave will tend to be weaker and further south. I'll play the probabilities and say south is still the way to go, 12z GFS notwithstanding.

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The deep vortex that causes the Friday-Saturday clipper is going to be spinning over QC just as the next s/w (the Sunday-Monday clipper) is diving around its backside. In that scenario, there's not going to be enough wavelength for the latter s/w to amplify. A flatter, more southerly wave is the way to go.

Eat your crow mike

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