Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 300704

Area Forecast Discussion
National Weather Service Northern Indiana
303 AM EDT Tue May 30 2017

Issued at 303 AM EDT Tue May 30 2017

Seasonably cool today as mostly clear skies this morning turn partly
cloudy this afternoon with an isolate shower possible late.
Highs will range from the low to mid 70s.


.SHORT TERM...(Tuesday through Tuesday Night)
Issued at 303 AM EDT Tue May 30 2017

Similar setup aloft seen versus last night. Upper low continues to
spin swwd of James Bay with parade of weak disturbances rotating
through srn periphery of H5 trough. Next wave of note now crossing
into nw MN and will sweep sewd across lake MI by this evening.
Boundary layer however has continued to dry with mid 40 dewpoint
noted upstream and with a generally cooler low level airmass
advecting in expect even less of a shower threat this aftn/evening
compared to yesterday. Thus will truncate pops to slight chance all
areas and shift focus to late aftn/evening.

Otherwise lingering shower possible along mid level trough axis this
evening across srn/sern zones with partial clearing elsewhere.
Expansion of nrn plains ridge sewd will yield a seasonably cool
night with upper 40s/low 50s.


.LONG TERM...(Wednesday through Monday)
Issued at 303 AM EDT Tue May 30 2017

Upper low will reform over sern QB by Fri with some expansion of
upper ridge wwd through the nrn plains/wrn lakes. This will allow
baroclinic zone to sharpen and with vigorous jet stream disturbance
wrapping through the lakes late Fri and should promote vigorous
convection given return low level moisture/theta-e working north
into the area. Thereafter general height suppression aloft will
force baroclinic zone south into the lower OH and TN valleys as sfc
ridge broadens across the lakes.


.AVIATION...(For the 06Z TAFS through 06Z Tuesday Night)
Issued at 123 AM EDT Tue May 30 2017

A few light showers may graze KFWA over the next hour or so as a
weak disturbance departs but should cause no concerns. Otherwise a
quiet night will be in store with cu popping once again with
strong mixing late Tues am into the afternoon. Much like
yesterday, another weak disturbance will move through during peak
heating to bring a outside chance for a shower or storm, mainly at
KSBN. Coverage and confidence doesn`t warrant more than a VCSH
mention for now at KSBN. Skies will clear out again after 00Z





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