Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 220710

National Weather Service Northern Indiana
310 AM EDT Sat Apr 22 2017

Issued at 159 AM EDT Sat Apr 22 2017

Skies will gradually clear from the northwest today as a ridge of
high pressure builds into the region. Highs will be in the 50s.
Mostly clear and cold conditions will favor some frost tonight.
with lows from 35 to 38. Sunny and warmer conditions are expected
Sunday with highs from 65 to 70.


.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 06Z TAFS through 06Z Saturday Night)
Issued at 153 AM EDT Sat Apr 22 2017

A ridge of high pressure will keep a cool and dry northeast flow
over northern Indiana through the TAF period with unrestricted
ceilings and visibilities.


LM...Small Craft Advisory until 11 AM EDT this morning for LMZ043-046.




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