Colorado Mesoscale Discussion

Areas affected…North central NE through northeast CO

Concerning…Heavy snow

Valid 192245Z – 200145Z

SUMMARY…Heavy snow and periodic blizzard conditions will continue
across north-central Nebraska through northeast Colorado through
00UTC.

DISCUSSION…Recent regional radar imagery shows an organized snow
band associated with a region of strong 700 mb frontogenesis and
deformation extending from northeast CO northeastward into north
central NE. Synoptic ascent associated with an ejecting upper level
low overlapping with this mesoscale forcing are driving heavy
snowfall rates between one to two inches per hour.

Additionally, strong cold advection in the low levels are steepening
low level lapse rates that will enable efficient downward mixing of
30-40 knot winds above the surface. The combination of heavy snow
and strong winds are causing persistent blizzard conditions across
northeast CO where low level winds are strongest and periodic
blizzard conditions further northeast into NE. Recent hi-res
guidance suggests that continued deep lift and cooling throughout
the column will continue to support these winter conditions through
00 UTC when pressure gradient winds and forcing for ascent diminish
with the eastward translation of the low.

..Moore/Squitieri.. 03/19/2020

…Please see www.spc.noaa.gov for graphic product…

ATTN…WFO…FSD…OAX…LBF…UNR…GLD…PUB…BOU…CYS…

LAT…LON 41800035 41520109 40930175 40470215 39870252 39320259
38940276 38780300 38650339 38680394 38710446 38810485
38890499 39840553 40490548 41430492 42120365 42640227
43130063 43279947 43429835 43479720 43309673 43019665
42769669 42579730 42409804 42229878 42069936 41800035

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