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January 30-February 1 Winter Storm Part 2


Hoosier
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Went outside to bring in a couple packages and there's already a nice thin glaze on everything from the freezing drizzle.  However, once the rain starts when it gets here it's going to run off as temps are already in the lower 30s.  Multiple personal weather stations in Cedar Rapids reporting temp at 31F.

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Nice tip from Ryan at KIND in the near term...

.NEAR TERM /Rest of This Afternoon and Tonight/...
Issued at 332 PM EST Sat Jan 30 2021

Well...it is about go time with our impending winter storm as an
area of precipitation largely in the form of rain approaches
steadily from the southwest this afternoon. 20Z temperatures are
largely in the mid and upper 30s over the forecast area currently.

Moving into the nowcast phase at this point with the onset of heavy
snow now just a few hours out and expected to impact the northeast
half of the area from late afternoon/early evening into the
overnight. For those that might be alarmed at the fact that the bulk
of the precipitation approaching is in the form of light rain...do
not be. This was and has been expected. Some patience is going to be
required to let the atmosphere do what it needs to in order for snow
to commence by early evening at most. First off...a cold dry airmass
remains over the region and some time will be needed to fully
saturate the column. That will take place over the next few hours
courtesy of increasing moisture advection into the region as a low
level jet strengthens. This feature will work in tandem with
increasing isentropic lift as well. The kicker though to help
introduce the snow will be the evaporative cooling processes which
will serve to cool the lower levels as moistening takes place. With
wet bulb temps remaining in the lower 30s...should see surface temps
fall back close to freezing and allow a quick changeover to snow by
22-23Z for much of the northeast half of the forecast area.
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