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February 4-5th Winter Storm Part 2


Chicago Storm

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Was just going to post the NMM, it's also closing off the wave like the NAM and looks a tad more impressive both aloft and is in the far western camp with regards to the sfc low track. It has like dual sfc lows but the western one gets as far west as almost PAH

 

attachicon.gifhrw-nmm_eus_030_500_vort_ht.gif

 

good eyes...you can see how that translates to a little more of a NNE swath as opposed to a ENE....not much...but with the tight gradients it's note worthy

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LOT

 

OVERNIGHT INTO MIDDAY TUESDAY WILL BE RELATIVELY QUIET WITH LIGHT
WINDS AND VFR CONDITIONS. HIGH PRESSURE LIES OVER THE AREA AND WILL
LIFT NORTH WITH WINDS BECOMING NORTHEASTERLY BY MID MORNING. WINDS
WILL GRADUALLY PICK UP THROUGH THE DAY AND CIGS WILL LOWER AS LOW
PRESSURE LIFTS FROM THE SOUTHERN PLAINS INTO THE OHIO VALLEY. WARM
ADVECTION AHEAD OF THE LOW WILL GRADUALLY SATURATE THE COLUMN TOP
DOWN...AND SNOW SHOULD BEGIN REACHING THE SURFACE BY LATE AFTERNOON
OR EARLY EVENING TUESDAY. EXPECT CONDITIONS TO QUICKLY DETERIORATE
AS THIS OCCURS. GUIDANCE HINTS AT AN F-GEN BAND DEVELOPING OVER THE
CHICAGO AREA RESULTING IN SOME LOCALLY HEAVIER SNOW WITH VSBY LESS
THAN A MILE POSSIBLE. DO NOT HAVE CONFIDENCE THIS FAR OUT EXACTLY
WHERE THE BAND WILL DEVELOP...BUT CURRENTLY APPEARS MOST FAVORABLE
BETWEEN ROUGHLY 04-09Z. IF IT DOES DEVELOP...VSBY IN 1/2 TO 3/4 SM
RANGE WOULD BE A DISTINCT POSSIBILITY. THE HIGHEST SNOWFALL TOTALS
ARE EXPECTED SOUTH OF I-80...HOWEVER STILL APPEARS FAVORABLE FOR A
FEW INCHES OF ACCUMULATION FOR THE CHICAGO AND ROCKFORD TERMINALS.
WINDS WILL BECOME INCREASINGLY GUSTY OVERNIGHT WITH GUSTS INTO THE
LOW TO MID 20 KT RANGE EXPECTED BY EARLY WEDNESDAY MORNING RESULTING
IN SOME BLOWING AND DRIFTING OF SNOW. SOME LIGHTER SNOW MAY LINGER
THOUGH THE MORNING WEDNESDAY. 

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LOT

 

OVERNIGHT INTO MIDDAY TUESDAY WILL BE RELATIVELY QUIET WITH LIGHT

WINDS AND VFR CONDITIONS. HIGH PRESSURE LIES OVER THE AREA AND WILL

LIFT NORTH WITH WINDS BECOMING NORTHEASTERLY BY MID MORNING. WINDS

WILL GRADUALLY PICK UP THROUGH THE DAY AND CIGS WILL LOWER AS LOW

PRESSURE LIFTS FROM THE SOUTHERN PLAINS INTO THE OHIO VALLEY. WARM

ADVECTION AHEAD OF THE LOW WILL GRADUALLY SATURATE THE COLUMN TOP

DOWN...AND SNOW SHOULD BEGIN REACHING THE SURFACE BY LATE AFTERNOON

OR EARLY EVENING TUESDAY. EXPECT CONDITIONS TO QUICKLY DETERIORATE

AS THIS OCCURS. GUIDANCE HINTS AT AN F-GEN BAND DEVELOPING OVER THE

CHICAGO AREA RESULTING IN SOME LOCALLY HEAVIER SNOW WITH VSBY LESS

THAN A MILE POSSIBLE. DO NOT HAVE CONFIDENCE THIS FAR OUT EXACTLY

WHERE THE BAND WILL DEVELOP...BUT CURRENTLY APPEARS MOST FAVORABLE

BETWEEN ROUGHLY 04-09Z. IF IT DOES DEVELOP...VSBY IN 1/2 TO 3/4 SM

RANGE WOULD BE A DISTINCT POSSIBILITY. THE HIGHEST SNOWFALL TOTALS

ARE EXPECTED SOUTH OF I-80...HOWEVER STILL APPEARS FAVORABLE FOR A

FEW INCHES OF ACCUMULATION FOR THE CHICAGO AND ROCKFORD TERMINALS.

WINDS WILL BECOME INCREASINGLY GUSTY OVERNIGHT WITH GUSTS INTO THE

LOW TO MID 20 KT RANGE EXPECTED BY EARLY WEDNESDAY MORNING RESULTING

IN SOME BLOWING AND DRIFTING OF SNOW. SOME LIGHTER SNOW MAY LINGER

THOUGH THE MORNING WEDNESDAY. 

 

If snow is reaching the ground here by late afternoon as they think then a few inches will be too low

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Me too.  :snowing:

 

I think you're too low for your area. 

 

That dry layer is concerning. As of right now, the floor seems to be somewhere around 2.5-3.5" and I feel most comfortable riding that floor. Certainly there exists some upside potential, perhaps four or five inches if everything breaks nicely. I think there will be a substantial gradient across Jasper County. This time I happen to be on the wrong side of that gradient. Definitely fine with that, though, as I had my excitement during the weekend surprise. Also it is nice to see you guys cash in on some of that goody. Lafayette is my second home so I'm always rooting for a good pounding down there. 

 

Just hope there is an outside chance at getting six more inches on the season. It would put us in the snowiest winter on record. Of course that's based on COOP data, so not the best; still, it feels like a massive accomplishment. I feel greedy asking for more snow during this amazing winter but........ya know. :)

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If snow is reaching the ground here by late afternoon as they think then a few inches will be too low

 

 

 

we're going to sit in a screw hole for a few hours.

 

the NAM also backed off it's 0z run which closed off.

 

the always wet weenie NMM barely even brings .1 to MKX's WWA counties.

 

and the WV/radar trends do not hint at an over performer.

 

on the plus side, SREF plumes remain steadfast with the 5" idea...but they've been tossed by LOT

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2.1 looking golden as model qpf continues to drop off

Consensus qpf for the metro on the 6z runs is about 0.25, even if you shave that down .05 or so to account for the dry air, ratios should average 15:1, possibly higher, which would yield 3" to maybe close to 4" in spots. I think your call is just slightly low but not a bad one and fits the range my office has been advertising. I do give a chance for a bump in the 12z runs which will have RAOB data in them.

But barring big unforseen changes today, though we won't get significant snows, at least it appears we're not going to get shut out like late March last year.

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Better to be lucky than good...because typically we don't do good in winter, or this good anyway. :D

 

Toronto looking better and better, no? Hopefully this one overachieves for everyone.

 

Save the luck for the Feb 9 storm. We'll need sleighloads of it then.

 

Yeah, looks good for us. No LAF amounts, but enough to keep the snow weenies in business up there.

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DTX not impressed with ratios, although a lot of their talk seems to be tied to the proximity of the dryslot, which won't get close to us in Toronto.

 

THIS WILL THEN BE FOLLOWED BY THE MID LEVEL DRY SLOT
THAT WILL MARK THE TRANSITION TO MORE OF A PURE DEFORMATION PATTERN
THAT REPRESENTS THE MAIN POINT OF CONTENTION AMONG THE MODEL
SOLUTIONS. MODEL CROSS SECTIONS AND FORECAST SOUNDINGS DO INDICATE A
SHALLOW LAYER OF STEEP LAPSE RATES ROOTED IN A SHALLOW DGZ CENTERED
AROUND 500 MB WITH A DEEP STABLE/ISOTHERMAL LAYER BELOW 600 MB TO
THE SURFACE. THIS, ALONG WITH A LACK OF SUPERSATURATION WITH RESPECT
TO ICE AND THE PROXIMITY OF THE DRY SLOT, WILL AMOUNT TO MODEST SNOW
RATIOS OF 10-12:1 ON LIQUID QPF CLOSER TO 0.3 OR 0.4 WITH HEAVIER
AMOUNTS OCCURRING CLOSER TO THE TRACK OF THE SURFACE LOW.
AFTER
SUNRISE WEDNESDAY, THE NAM SOLUTION ALSO LOOKS OVERDONE ON THE
TRAILING MID LEVEL DEFORMATION MAINTAINING TOO MUCH FORCING AS THE
SYSTEM RAPIDLY FILLS ACROSS THE APPALACHIANS AND TRANSFERS ENERGY TO
THE ATLANTIC COAST. THE RESULT WILL BE A FAIRLY QUICK DIMINISHING
TREND IN THE SNOW DURING THE MORNING WITH CLOUDY BUT DRY CONDITIONS
FOR WEDNESDAY AFTERNOON.

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DTX not impressed with ratios, although a lot of their talk seems to be tied to the proximity of the dryslot, which won't get close to us in Toronto.

THIS WILL THEN BE FOLLOWED BY THE MID LEVEL DRY SLOT

I suppose they're worrying about the energy/dynamics split as shown in the NAM's radar (though it's not technically a dry slot).

I mean otherwise, logic would dictate that we would also get heavier snow amounts if we're flirting with the dry slot.

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Consensus qpf for the metro on the 6z runs is about 0.25, even if you shave that down .05 or so to account for the dry air, ratios should average 15:1, possibly higher, which would yield 3" to maybe close to 4" in spots. I think your call is just slightly low but not a bad one and fits the range my office has been advertising. I do give a chance for a bump in the 12z runs which will have RAOB data in them.

But barring big unforseen changes today, though we won't get significant snows, at least it appears we're not going to get shut out like late March last year.

 

 

i'm really only pimping it because it was made 72 hours out. It's clearly a bit of a low ball at this point based on consensus guidance but certainly not unrealistic.

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