Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 171158

Area Forecast Discussion
National Weather Service Northern Indiana
658 AM EST Sun Dec 17 2017

Issued at 230 AM EST Sun Dec 17 2017

Today will feature increasing clouds and low chances for a few
rain showers by this afternoon. Highs will generally range between
the upper 30s and mid 40s. Patchy areas of drizzle and overcast
skies are expected into tonight and Monday with temperatures in
the mid 30s to mid 40s. High pressure then builds in for the
middle of the week with sunshine and above normal temperatures.
This will be followed by a good chance for rain Friday, possibly
ending as some snow into Friday night as a strong cold front moves
through. Next weekend into Christmas continues to look much colder
and mainly dry.


.SHORT TERM...(Today through Monday)
Issued at 230 AM EST Sun Dec 17 2017

Low stratus and patchy fog is expanding a bit into far ne IN/sw
Lower MI/nw OH early this morning just north of a weak stationary
boundary. The low mid December sun angle and little movement to the
boundary could allow the low stratus to linger in these areas through

A southern stream shortwave over the Southern Plains will minor
northeast through the OH Valley and Lower Great Lakes this afternoon
bringing chances for light rain to areas mainly southeast of US 24.
Any amounts will be very light given weakening nature to the forcing
and lack of deeper moisture return this far north. Becoming cloudy
with highs generally in the upper 30s to mid 40s otherwise today.

Overcast and at times drizzly weather will become the story later
tonight into Monday near a leftover/diffuse sfc trough. This weak
feature in tandem with continued low level moisture flux and drying
aloft in sw flow will set up this potential for drizzle or very
light showers. Could also see fog, though there should be enough
flow to preclude more widespread/impactful vis restrictions.


.LONG TERM...(Monday Night through Saturday)
Issued at 230 AM EST Sun Dec 17 2017

High pressure builds in with quiet wx and a continuation of above
normal temps into the middle of the week. Flow amplifies
thereafter with significant negative EPO trough amplification into
NOAM. This transition will force a strong cold front through
around Friday/Friday night with rain possibly ending as some snow.
Much colder air then overspreads post-frontal into next weekend.


.AVIATION...(For the 12Z TAFS through 12Z Monday Morning)
Issued at 653 AM EST Sun Dec 17 2017

Weak flow was over the area with winds from the east over northern
Indiana. A marine layer was drifting west into northern Indiana
with visibilities between 1/4 and 1/2 just north of FWA. Given
recent trends, believe the lower visibilities will stay north of
FWA, although some MVFR fog is likely at SBN. Otherwise, conditions
will be VFR until this evening with low MVFR or IFR ceilings move
in from the south.




SHORT TERM...Steinwedel
LONG TERM...Steinwedel

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