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Winter Storm? Jan 18-19th, 2019


cyclone77
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10 minutes ago, whoosh said:

image.png.14c83071c472183b7d7f8f04cc1e4fd3.png

Will see if FGEN band stays north or hits our area as depicted earlier. You can usually find some short range model on a particular run that disagrees with prevailing thought. Funny at longer range posters tend to find the model scenarios that optimize snow possibilities whereas at short range the globals plus short range models give us a lot more looks to discount it.

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Im lost, is NW Ohio getting bombed or whiffed to the South? Very confused by all the data. Seems like a nowcast is going to be what we have now. Also looking at the radar is this storm speeding up and getting here earlier and leaving faster? I plow snow for the City and Im just curious. Thanks

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ILN just issued Winter Storm Warnings for essentially the Muncie-Columbus (EDIT: not Muncie specifically, but Wayne County to the east) corridor, which *seems* like the most certain area to get big snow totals despite all the variations in models this AM. Winter Storm Watches remain elsewhere.

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FWIW, looking at 16 UTC SPC mesoanalysis, the surface low is actually a bit stronger compared to most models. Seems lock step with the 12z RGEM in placement, but actual low is stronger. Again note that the low placement isn't everything here. It's just a factor that can certainly help us out.

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2 minutes ago, cyclone77 said:

That fronto band is cranking pretty nicely this morning.  Numerous reports of 1/4 mile vis from northern IA back into South Dakota.  1/8 mile in Forest City IA atm.

Temps in the teens too. Probably rocking 20:1+ ratios in that band from Forest City, IA thru Worthington, MN.

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LOT update:

 

.UPDATE...
1038 AM CST

In summary, no significant changes to the message for this event
this morning. One element we did alter was the mid-late afternoon
snow potential, confining the highest likelihood of commute
impacts to I-90 and north.

Will have more in the afternoon discussion overall, but will
briefly describe some observational trends tied to onset time and
evolution into the evening. The well-defined northern stream mid-
level wave across southeast South Dakota has been mainly moving
due east, a little further north than guidance indicated last
night. This will start to trend more east-southeast as a gradual
phasing with the southern stream low begins to occur. The active
baroclinic zone draped from the Minnesota/Iowa border region into
southwest Wisconsin this morning is gradually filling in with
snow, some heavy. As this has filled in it has slowed its northern
progress. Extrapolating its current development would bring it
into the northern CWA this afternoon, and more so the far northern
CWA (I-90 and north) as it becomes robust around sunset. High-
resolution guidance generally supports this. There may be a period
mid-afternoon where further south of that does still see snow,
but the stronger frontogenesis (f-gen) and vertical circulation
for appreciable snow looks to be more focused in the far north.

As broader synoptic forcing overspreads the region this evening,
snow should spread from west to east across the area. F-gen
signatures become somewhat transient, but there remains
indications of that as the systems gradually phase in the broad
northern precipitation shield over the area. General snowfall
forecast amounts still look good. Some parts of the I-88 corridor
have been lowered just slightly because of the aforementioned
mid-late afternoon expectations.

While could justify backing up the start time of some of the
warning counties along I-88 that begin at 3 pm, the northern
parts of these counties, including Cook, could certainly still
get into the f-gen driven more moderate snow. So have left as is.
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7 minutes ago, geddyweather said:

ILN just issued Winter Storm Warnings for essentially the Muncie-Columbus corridor, which *seems* like the most certain area to get big snow totals despite all the variations in models this AM. Winter Storm Watches remain elsewhere.

Muncie is not under a warning and they are not in the ILN area.

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10 hours ago, Hoosier said:

Lake effect is an obvious wildcard but I like the 7-10" range here for a combined storm + LES total.  It's a bit difficult at this time to pick out the most favored area for the most persistent LES.  I think the lake will add a general 3-6" to the totals with potential for over 6" wherever it ends up persisting longest. 

Going to be a nail-biter with LE, as always. Some of the latest mesoscale indications seem to point towards a band that is organized, yet a bit transient in nature. Of course how it reflects will always be up to any hyper localized influencers. For NW Indiana as a whole, I'm thinking 2-4" from the storm with another 2-4" north of 30 for the LE. Lollipop potential north of 80, especially in Lake County. 

(I.e., I generally agree with your range)

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Just now, michaelmantis said:

Looks like Winter Storm Warnings expanded north a few counties in Wisconsin (Madison area for example)...

Yep, updated totals up to 5" to 7".  still think we may get the higher end of that.  Still some dry air at lower levels to overcome, dewpoint of 7 in Madison.  Dewpoint of 5 in Prairie Du Chien with heavy virga overhead

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