Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 290459

Area Forecast Discussion
National Weather Service Northern Indiana
1259 AM EDT Wed Mar 29 2017

Issued at 243 PM EDT Tue Mar 28 2017

Rain returns Thursday and continues into Friday as a large upper
level system moves into the area. Rainfall amounts should range
from half an inch to over an in by late Friday. Until then quite
and seasonably weather will predominate through Wednesday night.
Highs the rest of the week will be mainly in the 50s with lows in
the 30s and 40s.


.SHORT TERM...(This Evening through Wednesday)
Issued at 243 PM EDT Tue Mar 28 2017

Potent sw disturbance over sw NM this aftn will eject out through w
TX tonight and then open northeast into the wrn OH valley Thu. At
the sfc... ridge extending swd out of Hudson Bay will retreat ewd
into QB as broad srly rtn flow develops on the backside. In the
interim shallow dirty inversion in place should continue to whittle
down as nerly low level dry entrainment upticks overnight into Wed
am. Thereafter will continue to hold out hope that partial
insolation develops on Wed resulting in more vigorous diurnals.


.LONG TERM...(Wednesday Night through Tuesday)
Issued at 243 PM EDT Tue Mar 28 2017

Aforementioned TX shortwave will open and slowly kickout south of
the OH river Fri. In advance of this system... robust deep moisture
tongue with GOMEX origin will advect north into the srn lakes Thu
and interact with frontal zone to bring widespread rainfall to the
area esp Thu morning through Thu evening. Additional shra likely Fri
morning as upper trough overhead accelerates ewd.

Secondary following potent epac disturbance takes a similar track
into the swrn US Fri and then out through the srn plains this
weekend. Short amplitude ridging inbetween with seasonably temps.
This sys then expected to kickout ahead of nrn stream sw advancing
through the nrn Rockies Mon. Details on ewd evolution of this sys
remain quite unclear with sizable spread aloft indicated in spectral
models. Will therefore temper blended pops late Mon-Mon night.
Regardless more substantial temp moderation indicated early to mid
next week ahead of central plains gyre.


.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1257 AM EDT Wed Mar 29 2017

Drier air associated with ridge over the upr grtlks was
overspreading nrn IN clearing out mvfr cloud deck. However, movement
of back edge was quite slow upstream of FWA, thus have pushed
back clearing there a few hours. Radiational cooling br/fg has
formed where skies cleared in srn MI but has been short lived as
drier air winning out, thus, only added a brief tempo mvfr vsby to
terminals. Otrws vfr conditions expected the remainder of the taf
period. Tight pressure gradient between high centered over se
Canada and low lifting ne from the srn plains will result in
increasing easterly winds today while high clouds associated with
the approaching low overspread nrn IN and grdly lower this


LM...Dense Fog Advisory until 8 AM EDT this morning for LMZ043-046.




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