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fxus63 kgid 081107 
afdgid

Area forecast discussion
National Weather Service Hastings NE
507 am CST sun Dec 8 2019

..aviation update...

Discussion...
issued at 214 am CST sun Dec 8 2019

We'll see another day of mild/warm December weather today before
colder air returns for the start of the workweek. The airmass across
our region will remain similar to yesterday in fairly zonal flow
aloft over the plains ahead of a upper trough extending from Canada
to the western Continental U.S.. we are looking for another day with high temps
in the 50s (generally 10-15f above normal for this time of year)
with winds lighter than what we saw Saturday in weaker flow. Cloud
cover will be on the increase though and satellite imagery already
shows clouds streaming east from Colorado and south from North
Dakota.

The weather pattern undergoes changes tonight as an upper trough
translating southeast from Alberta across the northern/Central
Plains drives a strong cold front thru our area. The boundary is
expected to reach our northwest zones shortly after midnight and surge
south through the remainder of our cwa overnight. The front will
be a noticeable one, marked by strong northerly winds with gusts
30-40 mph and much colder air. The combination of the cold air and
strong winds will produce wind chills values ranging from the
single digits below zero in our northern zones...to the single
digits above zero in our southern areas Monday morning. This cold
air will be quite the change from the weather we saw over the
weekend, so be prepared to bundle up.

The cold front and upper trough may also generate some light precip
overnight/early Monday. Overall chances are not great as it will
take some time for saturation to occur and align with upper forcing.
Model forecast soundings suggest a dry mid layer or dendritic layer
at times before the trough axis departs mid day Monday and therefore
have went more with mixed light precip chances for drizzle/freezing
drizzle or sprinkle/flurries with little if any accumulation.

A deepening upper trough from the plains to the Ohio Valley region
will maintain our cold airmass through at least Tuesday, then as the
upper trough axis departs farther eastward we'll see some moderating
temperatures heading into Wednesday. The forecast remains dry thru
the day on Friday with a warming trend in temps. Small chances for
precip return to the forecast Friday night with a progressive
shortwave trough but not anything big or significant attm. Then
over the weekend, the forecast turns cooler with some chances for
snow around the Saturday night/Sunday time frames.

&&

Aviation...(for the 12z kgri/kear tafs through 12z monday)
issued at 502 am CST sun Dec 8 2019

The daytime hours will see light winds and increasing high level
cloud cover. Then tonight, a strong cold front will cross the
terminals bringing a northerly wind shift and increasing wind
speeds with gusts around 30kts. Lower clouds will advect south
behind the front and have included scattered MVFR clouds but kept
cigs at VFR for now. There is a slight chance for some light
precipitation which could be a sprinkle/flurry or drizzle/freezing
drizzle or possibly sleet.

&&

Gid watches/warnings/advisories...
NE...none.
Kansas...none.

&&

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