I don't know what's going on with the HRRR. The 00z run had heavy snow through northern Iowa. The 06z run was weaker and through central Iowa. The 12z run is weaker and through southern Iowa.
Your going to do great...what a great storm for the Heartland of the USA...Good Ol' Midwest Mauler in the works! BTW, my gut says your going to have a record JAN for your business. That's just my prediction for this month. Good luck!
EAX this morning. With a good lengthy discussion.
There is still quite a bit of uncertainty with the system Sunday
into Monday. Both deterministic and ensemble suites are somewhat
more consistent with favorable forcing for accumulating snowfall to
move across the lower Missouri River Valley. There is still
discrepancies with respect to the propagation speed of the system,
and if you are tracking raw snowfall output from deterministic
guidance, then you have probably noted run to run shifts in snowband
development. In one run, a lot of snow along the Interstate 44
corridor, and the next run shifts it to between Interstate 70 and
Hwy. 36. Overall probabilities for QPF above 0.50 inches Sunday into
Monday have increased, there are some solutions saying the the
liquid equivalent could be between 1.50 to 1.75 inches, but others
are more along the lines of 0.60 to 1.10 inches. Differences in
exact track may be causing this. For blended probabilities suites
like NBM, which includes time lagged models and mixed time model
cycles, this is still broad brushing about 1-3 inches across much of
the region. However, if you focus on just one ensemble suite and one
time cycle, mean snowfall values within the heaviest axis are
coming in between 5-8 inches of snowfall. Now, with each 06 hourly
run, this axis of heaviest snowfall output can still shift 150-200
miles (note the previous mention of the Interstate 44 corridor vs
between Interstate 70 and Hwy. 36). However, this is more consistent
in the past few runs compared to ensemble runs done 48 hours ago.
Therefore, am more comfortable now discussing the probabilities.
Right now, probabilities for at least 6.0 inches of snowfall across
lower Missouri River Valley is around 30 to 40 percent in the GEFS,
but slightly lower in other ensemble suites. Probabilities for at
least 3 inches are around 60-70 percent, and this is more consistent
amongst multiple ensemble suites. If you are still wondering about
the 12-15 inches that deterministic GFS keeps outputting, just in
drastically different locations each time, very few ensemble members
support this. Ensemble probabilities for exceeding 12 inches is
currently under 15 percent (even for areas well outside our forecast
area). Therefore, not giving any consideration to these 10+ inches
in our forecast. With that being said, Winter Storm potential
overall is increasing, at least based on potential snowfall. Will
also point out this is expected to be strong cyclone, we could see
winds above 30 MPH occur with this. We will likely see strong
baroclinicity associated with this. There is potential for warm
noses to develop that could create melting layers, perhaps resulting
in mixed precipitation depending on the exact track of the system.
Keep in mind if this happens, that eats into the snowfall totals, so
the high QPF output we are noting with this may not go all into
snow. There are few ensemble members that still track the cyclone
much further south that take us out of the forcing, and leave us
just with bitterly cold temperatures and dry conditions. But as
indicated before, probabilities for measurable QPF have increased.
Still not ready to advertise exact amounts yet, but it does seem the
ensemble output can start to give us an idea at least on potential
impacts and the potential for this to be a Winter Storm. After this
system passes, expecting very strong CAA that will send temperatures
well below normal.