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Jan 22-24th Clipper Trio


Chicago Storm
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Got a coat of icing with the first round and a DAB. Tonight’s might be the most promising of the bunch.

 Also friendly reminder that there is a pivotalwx view that contains the whole sub forum so maps that have the lower Mississippi valley aren’t necessary 

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Just to elaborate a bit on the lake effect potential... here's an unmodified NAM fcst sounding over southern Lake Michigan at 15z Sun.  Inversion heights are around 800 mb... not great but could be worse.  Because lake temps have cooled significantly lately, delta T is "only" in the mid to perhaps upper teens.  Omega is sort of split with some in the dgz and some not, but should still result in pretty good flake size.  Should get a nice lake response that is perhaps capable of inch per hour rates or maybe slightly higher at peak.  The question is how progressive it will be and whether it can hang up somewhere for more than a few hours.

 

2022012218-NAM-021-41-84-87-15-severe-ml

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12 minutes ago, Hoosier said:

Just to elaborate a bit on the lake effect potential... here's an unmodified NAM fcst sounding over southern Lake Michigan at 15z Sun.  Inversion heights are around 800 mb... not great but could be worse.  Because lake temps have cooled significantly lately, delta T is "only" in the mid to perhaps upper teens.  Omega is sort of split with some in the dgz and some not, but should still result in pretty good flake size.  Should get a nice lake response that is perhaps capable of inch per hour rates or maybe slightly higher at peak.  The question is how progressive it will be and whether it can hang up somewhere for more than a few hours.

 

2022012218-NAM-021-41-84-87-15-severe-ml

Gary ftw

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11 minutes ago, mimillman said:

NWS added heavy snow pops to the P&C and accums upped to 3-5”

Celebrate good times, come on

 

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
328 PM CST Sat Jan 22 2022


.SHORT TERM...
Issued at 327 PM CST Sat Jan 22 2022

Through Sunday...

I made a couple of minor changes to the going winter weather
headlines, but only for my northwestern IN counties and Kankakee
county in IL. The main change was to add Lake and Porter IN to
the advisory through 15z Sunday. However, the winter storm watch
continues here from 15 to 21z Sunday for both the lingering
impacts from tonight 3 to 5 inch snow, and the likelihood for
accumulating lake effect snow during the day Sunday. I also opted
to push off the start time of the advisory for my northwestern IN
counties and Kankakee counties to 11pm tonight.

Not much has changed with the previous thinking for a period of
moderate to briefly heavy snow rates up to an inch per hour across
a good portion of northern IL into the northwestern IN tonight.
The main culprit for this is the mid level impulse, and its
associated surface low over the Dakotas early this afternoon. As
this disturbance races southeastward towards our area this evening
snow is expected to develop from northwest to southeast across a
good portion of northern IL and northwestern IN as the top-down
saturation occurs quickly within a zone of increasing warm air
advection. Expect the snow to onset in the 8 to 9 pm timeframe
this evening across the Rockford region, then by around 10 pm in
and around much of the Chicago metro area, and around, or shortly,
after midnight into northwestern IN.

Highest snow rates (up to 1"per hour) are expected in the 11 pm
through 4am period in IL and the 2am to 6am period in northwestern
IN, and will largely be driven by a strengthening lower level
frontogenetic circulation along the north-northeastern periphery
of the surface low. The combination of the strongly forced ascent
and a favorably deep dendritic growth zone will support a
efficiently high ratio (up to 20:1) type snow. Therefore, fluffy
snow amounts of 3 to 5 inches look likely in the band of snow that
looks to run right across northern IL into northwestern IN.
Lighter snow amounts of an inch or two are expected across my far
southern counties outside the current advisory.

The snow is expected to tapper off from northwest to southeast
early Sunday morning. This will end the threat for accumulating
snow for most areas by, or shortly after, daybreak Sunday
morning. The main exception to this will be across parts of
northwestern IN, where signs continue to point at lake effect snow
continuing through much of the day, possibly heavy at times.
Since confidence is high in 3 to 5 inch snow amounts across Porter
and Lake IN, we have opted to include them in the winter weather
advisory into early Sunday morning. However, with the concern for
a potentially more organized lake effect snow continuing during
the day, we have left the earlier issued winter storm watch in
place directly following the 15z end time of the winter weather
advisory. The main concern is that the combination of 3 to 5
inches of snow tonight, with at least some localized areas of
heavier lake effect snow on Sunday, could push total amounts into
the 5 to 9 inch range. This could thus result in dangerous travel
conditions, especially along the I-80, 90 and 94 corridors in
Lake and Porter IN. Since confidence on the exact location of the
potentially most organized band of snow on Sunday remains somewhat
unclear, we will hold off on issuing a warning at this time. The
lake effect snow threat will wane by early Sunday evening as the
winds over the lake back to a westerly direction.

KJB
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Chicago gonna pull its largest storm of the season (so far) out of this? The lift is really good for a brief time and ratios should be something like 20:1. Can easily see 1"+ per hour rates for a time...question is if it lasts long enough. Good model agreement, though the American models are a bit more amped and would be ideal.

850tadv.us_mw.thumb.png.349c1b05e973662f8b3a738d5a323888.png

gfs_temp_adv_fgen_850_ncus_3.thumb.png.429739c44c814bfef1d2fd9cc7b9705b.png

rgem_temp_adv_fgen_850_ncus_14.thumb.png.2ec9346e47fe3faf83f6668262d324c9.png

nam3km_temp_adv_fgen_850_ncus_14.thumb.png.ed521d050039a69ae9bc17aac77375a6.png

995608598_download(26).thumb.png.d9425725bdc05deed5ef707ef52a05cc.png

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14 minutes ago, OHweather said:

Chicago gonna pull its largest storm of the season (so far) out of this? The lift is really good for a brief time and ratios should be something like 20:1. Can easily see 1"+ per hour rates for a time...question is if it lasts long enough. Good model agreement, though the American models are a bit more amped and would be ideal.

850tadv.us_mw.thumb.png.349c1b05e973662f8b3a738d5a323888.png

gfs_temp_adv_fgen_850_ncus_3.thumb.png.429739c44c814bfef1d2fd9cc7b9705b.png

rgem_temp_adv_fgen_850_ncus_14.thumb.png.2ec9346e47fe3faf83f6668262d324c9.png

nam3km_temp_adv_fgen_850_ncus_14.thumb.png.ed521d050039a69ae9bc17aac77375a6.png

995608598_download(26).thumb.png.d9425725bdc05deed5ef707ef52a05cc.png

DAB rainer 

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