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ACUS11 KWNS 012027
SWOMCD
SPC MCD 012027=20
ILZ000-IAZ000-020030-
Mesoscale Discussion 0010
NWS Storm Prediction Center Norman OK
0227 PM CST Sat Jan 01 2022
Areas affected...Central/Southeast Iowa and Northern Illinois
Concerning...Heavy snow=20
Valid 012027Z - 020030Z
SUMMARY...Occasional 1 in/hr snowfall rates possible into the early
evening.
DISCUSSION...Regional radar shows a broad area of precipitation
extending from portions of central/southeast Iowa into
northern/central Illinois. Light to moderate snow has been
persistent across this region for the past several hours, with
localized/brief periods of heavy snow reported at a few stations, in association with broad low-level warm/moist air advection. Earlier,
a band of moderate to heavy snow was evident across southwest Iowa
and has since translated into parts of central Iowa. This feature is
likely in association with mid-level forcing for ascent from a
short-wave trough traversing the region and associated mid-level
frontogenesis, albeit weakening somewhat. Forecast soundings
continue to indicate nearly saturated conditions (e.g., RH values
exceeding 80-85%) and lift through a 700-800 m thick dendritic layer
across the region. This will continue to promote the development of
snow bands and areas of heavy snow with rates approaching 1 in/hr
into the early evening hours.
..Karstens.. 01/01/2022
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!s5Oh2vqHsXGvtgd8_QWta1IOszz97KEKwmlu6eKHeH2zXufsCA5EVYd2bj50MErnv0TbDqQH$=
for graphic product...
ATTN...WFO...LOT...ILX...DVN...DMX...
LAT...LON 40699058 40649261 41179365 41909299 42429018 42328813
41158829 40699058=20
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