Indiana and Michigan Mesoscale Discussion 0022 concerning heavy snow

Описание: 516
ACUS11 KWNS 142301
SWOMCD
SPC MCD 142301
INZ000-MIZ000-150500-

Mesoscale Discussion 0022
NWS Storm Prediction Center Norman OK
0501 PM CST Wed Jan 14 2026

Areas affected...Northern Indiana and far southwest Lower Michigan

Concerning...Heavy snow

Valid 142301Z - 150500Z

SUMMARY...A lake effect snow band will likely support heavy snowfall
rates in excess of 2 inches/hour across portions of northern Indiana
through the evening and into the overnight hours.

DISCUSSION...A lake effect snow band has been steadily organizing
over the past couple of hours across far southwest lower MI and
northern/northwest IN amid strengthening cold advection on the
backside of a passing upper disturbance. Surface observations under
the band report quarter-mile visibility with heavy snowfall, and
these observations are supported by live web cams in the South Bend,
IN area that show significant visibility reductions indicative of
heavy snowfall rates.

Recent surface observations and 925 mb analyses show a subtle
confluence axis established across southeastern Lake Michigan that
is forecast to persist and shift to the southwest over the next
several hours. Latest forecast soundings depict 6.5 C/km lapse rates
and saturated profiles from the surface through roughly 3 km.
Additional deepening/saturation of this layer possible as ascent
within the left-exit region of an approaching upper jet (currently
noted upstream across portions of MN/WI in water-vapor imagery)
overspreads the region heading into the evening/overnight hours.

Maintenance of a favorable low to mid-level thermodynamic profile,
steady low-level confluence, and relatively warm water temperatures
(approximately 35-40 F per recent analyses) along the southeastern
shore of Lake MI should all contribute to robust lake effect snow
band capable of heavy snowfall rates potentially exceeding 2
inch/hour. Strong winds within the lowest few kilometers, gusting to
30-40 mph at times, may support periods of blizzard conditions under
the band.

..Moore.. 01/14/2026

ATTN...WFO...IWX...LOT...

LAT...LON 41638720 41698702 41828675 42008656 42218640 42118627
41518579 41338576 41208584 41038613 40978632 40908658
40908680 40918701 40988722 41098723 41638720

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