Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 221735

Area Forecast Discussion
National Weather Service Northern Indiana
135 PM EDT Sat Apr 22 2017

Issued at 119 PM EDT Sat Apr 22 2017

Clouds will continue to shift southeast into the overnight as high
pressure and drier air pushes in. This may allow for patchy
frost in areas that clear out quicker as temperatures drop into
the mid and upper 30s. High pressure remains in control for
Sunday allowing for sunshine and highs between 65 and 70. High
pressure keeps us dry in the early portion of the week with our
next chance for rainfall coming Wednesday. After Sunday, our
temperatures will be warming through Tuesday allowing us to be
into the low to mid 70s on Tuesday.


.SHORT TERM...(Today and Tonight)
Issued at 309 AM EDT Sat Apr 22 2017

Quiet/tranquil this period as broad sfc ridging extending from the
central plains through the nrn lakes settles swd into the srn lakes
by early Sun. Primary concern is frost potential tonight within sfc
ridgeline through nrn IN/srn MI. However not overly concerned attm
given moderating low level thermal trough and will continue with
prior introduced patchy mention.


.LONG TERM...(Sunday through Friday)
Issued at 309 AM EDT Sat Apr 22 2017

Energetic pac wave train continues to be the focus this period. Lead
sw still shown to minor out well nw through the upper midwest late
Mon. Secondary disturbance has trended a bit deeper aloft over MN
and will drive a vigorous cold front through the area Wed per much
tighter consensus timing/placement and as such will make bold
modifications to pops Wed-Thu.

Much stronger tertiary sw of note follows late week along with major
signal noise. Main theme is active frontal sfc frontal zone esp with
wwd extent will return north ahead of tremendous deepening mid level
trough centered through the central plains sometime Fri with risk of
shra nw half Thu night into Fri am. Thereafter secondary upper
trough redevelops wwd and then lifts out into srn Canada this
weekend as cold front sweeps ewd through the OH valley. Certainly
some svr risk implied given deep mstr return ahead of this sys
and strong mid level flow along the frontal zone this weekend.

Temps generally well above normal through the period sans Thu.


.AVIATION...(For the 18Z TAFS through 18Z Sunday Afternoon)
Issued at 119 PM EDT Sat Apr 22 2017

A ridge of high pressure will remain in the Plains through Sunday
morning before shifting east Sunday. This will keep north and
northeast winds and CIGs and VISBYs in VFR range. In addition,
winds will be able to gust between 15 and 25 kts today as a low
level jet moves south through the area and some diurnal mixing





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