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January 12-14 Potential storm


dilly84

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That's what I noticed. the H5 low tracks just to our south rather than over us so we avoid the slot. Welp, it'll keep me up for the RGEM and GFS at least. :lol:

Lets hope it continues on the next few model runs. If it digs as far south as the Nam depicts then it will get very interesting.

The clown maps will be interesting.

For the clipper I'd use snow ratios as temps are cold enough to use ratios.

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What is the wind looking like with this system? A lot of talk about ratios, I think the wind will play as much a factor as the dendritic growth.

There has been chatter of flake shattering. I dont think it will be an issue. Personally Ive only seen that a few times and GHD Blizzard was one.

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Its looking almost certain that the most widespread snowfall of the season is imminent for the Great Lakes. After the razor thin stripes of snow on the backsides of systems that gave S MI most of its December snowfall, and the funky snow record in Midland, TX, and of course Alaska...Finally WIDESPREAD snow where it belongs, the Great Lakes/Midwest! :weenie:;) Main questions now are who gets screwed, who gets jackpotted. Though, will any snow REALLY feel like being screwed this winter?

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There has been chatter of flake shattering. I dont think it will be an issue. Personally Ive only seen that a few times and GHD Blizzard was one.

Had 0.87" liquid on feb 1/2 imby, total snowfall of 10.1", although since it was a prolonged 2-day ordeal, plus wind, dry period of 6 hours on Feb 1st afternoon... snow depth only increased from 6" (Jan 31) to 13" (Feb 3rd). Small flake size.

Meanwhile, on the contrary, with good dendrites, our storm on Feb 20/21 dropped 10.2" snow but 1.13" water (touch of sleet, marginal BL temps).

A lot of ingredients come into ratios it seems.

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lolz at the 0z NAM.

YYZ: 1.03". Starts tomorrow evening's round out as rain but then switches to snow as the column cools. Then the round Thursday night with the ul is mostly snow except for a bit of rain at the start. Spits out about an inch tomorrow night, then over 6" Thursday night. Um, I'll reserve judgment until I see what the other models say.

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lolz at the 0z NAM.

YYZ: 1.03". Starts tomorrow evening's round out as rain but then switches to snow as the column cools. Then the round Thursday night with the ul is mostly snow except for a bit of rain at the start. Spits out about an inch tomorrow night, then over 6" Thursday night. Um, I'll reserve judgment until I see what the other models say.

12z GGEM showed something similar...

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lolz at the 0z NAM.

YYZ: 1.03". Starts tomorrow evening's round out as rain but then switches to snow as the column cools. Then the round Thursday night with the ul is mostly snow except for a bit of rain at the start. Spits out about an inch tomorrow night, then over 6" Thursday night. Um, I'll reserve judgment until I see what the other models say.

:lmao:

Thats amazing.

Lets hope we can lock this one in ;)

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Upon further inspection, 00z NAM also seemed to slow a lot of things down here. qpf at DTW is 0.60", of which 0.36" is rain and 0.24" snow (still lightly snowing at 84 hr). Actually 0.24" is a brief grazing from the southern stream, then when the great lakes low gets involved, it starts as 0.12" rain then turns to 0.24" snow (changeover 10pm thurs night). Surface temps plummet from 38F at 7pm thurs to 15F at 7am Fri (then rebound to the upper 20s Friday). The best snow falls with temps in the teens.

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LOT update. . .

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

912 PM CST TUE JAN 10 2012

.DISCUSSION...

910 PM CST

HAVE TAKEN A PRELIMINARY LOOK AT THE 11.00 NAM AND 10.21 SREF DATA

FOR THE UPCOMING WINTER WEATHER EVENT. THE PRIOR RUN TO THE NAM

HAD BEEN THE MOST ROBUST OF ANY SO FAR...WITH PERIODIC HEAVY

BURSTS OF SNOW FAVORED THROUGH MUCH OF THE DAY. THE CURRENT NAM IS

SLOWER WITH THE MID-LEVEL LOW...KEEPING A DRY WEDGE OVER MUCH OF

OUR EASTERN FORECAST AREA...INCLUDING CHICAGO...THROUGH THE

MORNING THURSDAY. THIS NATURALLY WOULD FAVOR A SLOWER START TIME

TO THE SNOW. THE TRACK OF THE MID-LEVEL LOW IS ALSO SLIGHTLY

FURTHER SOUTH ON THE NAM AND SREF. THIS IS ACTUALLY A MORE

FAVORABLE PATH...PLACING THE AREA UNDER FOCUSED QG FORCING. THIS

WOULD FAVOR THREE PLUS INCHES OF SNOW ACROSS THE NORTHERN HALF TO

TWO-THIRDS OF THE FORECAST AREA...WITH AMOUNTS A COUPLE INCHES

HIGHER THAN THAT ALONG AND NORTH OF INTERSTATE 90 INCLUDING THE

NORTH CHICAGO METRO AND ROCKFORD. DISCUSSED THE POTENTIAL FOR A

WATCH WITH NEIGHBORING OFFICES. THE VARIANCE IN THE NAM SOLUTIONS

OVER THE PAST THREE RUNS PREVENTS US FROM ISSUING A WATCH AT THIS

TIME. LOOKING TO SEE IF THE 11.00 EC AND GFS WILL HELP TO FURTHER

VALIDATE OR DISCREDIT THE NAM SOLUTION.

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