Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 181040

Area Forecast Discussion
National Weather Service Northern Indiana
640 AM EDT Sat Mar 18 2017

Issued at 350 AM EDT Sat Mar 18 2017

Areas of dense fog accompanied by some light drizzle will end by
daybreak as a cold front moves east. A few rain and snow showers
are possible today as highs climb to near 40 degrees. High
pressure will move back into the area Sunday resulting in dry
weather with near normal temperatures. Rain is likely late Sunday
night into Monday as another cold front moves through with colder
temperatures returning for the middle of next week.


.SHORT TERM...(Today and Tonight)
Issued at 344 AM EDT Sat Mar 18 2017

Have been trimming back the western extent of the Dense Fog
Advisory, mainly west of Interstate 69 as katabatic winds behind
the front were helping to clear out the fog. Left the Dense Fog
Advisory at the morning forecast issuance time over areas mainly
east of of I69 where winds were still light south to southwest.
The advisory should not have to be extended and may be cancelled
before the expiration time at 7 AM if the fog lifts over this
area. Otherwise, somewhat colder air will spread back into the
area today as the surface low tracks southeast and gets absorbed
very quickly into the east coast system. This quick handoff will
greatly limit precipitation north of the Ohio River.


.LONG TERM...(Sunday through Friday)
Issued at 344 AM EDT Sat Mar 18 2017

Return flow will set up rapidly late Sunday ahead of the next system
that will bring mainly rain to the area Monday.  An initial rain and
snow mix is possible at the onset of precipitation late Sunday
night. Temperatures will be warmer than this past event. No snow
accumulation is expected Monday and no travel issues are expected.
Otherwise, dry and seasonably cool weather is expected Tuesday
and Wednesday with highs around 50 Tuesday and only 40 Wednesday
as cool Canadian air spreads into the area. The next system will
arrive about Friday and will be similar to the Monday system with
rain/snow mix possible at the onset of the event over northeast
areas, otherwise the precipitation should be all rain. Travel
impacts are not expected with this second system.


.AVIATION...(For the 12Z TAFS through 12Z Saturday Morning)
Issued at 640 AM EDT Sat Mar 18 2017

Post frontal cold advection and residual moisture has led to
widespread mvfr conditions overspreading the terminals this morning
and expected to persist through the period. Isold shra likely to
become more numerous by this aftn given mid March sun and sfc
heating underneath secondary cold pocket aloft. Will hold off
mention at KSBN given inland penetration of lake shadow yet
otherwise add vcsh at this juncture for KFWA.


IN...Dense Fog Advisory until 7 AM EDT this morning for INZ007-009-

MI...Dense Fog Advisory until 7 AM EDT this morning for MIZ081.

OH...Dense Fog Advisory until 7 AM EDT this morning for OHZ001-002-

LM...Small Craft Advisory until 11 PM EDT this evening for LMZ043-



SHORT TERM...Skipper
LONG TERM...Skipper

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