Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 261013

Area Forecast Discussion
National Weather Service Northern Indiana
613 AM EDT Tue Sep 26 2017

Issued at 420 AM EDT Tue Sep 26 2017

One final day of unseasonably warm weather with high temperatures
ranging from the upper 80s to around 90 this afternoon. A cold
frontal passage tonight will have limited moisture and only bring a
small chance of a shower or sprinkle. This front will bring in a
noticeably cooler air mass for the latter part of the week and
into the weekend, with highs generally 65 to 70 and lows at night
down into the 40s.


.SHORT TERM...(Today and Tonight)
Issued at 422 AM EDT Tue Sep 26 2017

Shortwave ejection from western CONUS trough through Dakotas north-
northeastward into western Ontario. Northerly track along with n
marrow low level theta-e axis sans gulf entrainment does not bode
well for any significant pops/qpf later tonight into Wednesday
morning. Strong insolation within well established warm sector to
support persistence with respect to high temps today, about 90F with
potential record/near records at KFWA/KSBN of 92/91, respectively.


.LONG TERM...(Wednesday through Monday)
Issued at 422 AM EDT Tue Sep 26 2017

Arrival of strong eastern Pacific energy near 55N/140W and
subsequent entrance into broad downstream Great Lakes trough late
Thursday night into Friday to further deepen cooler airmass across
the region as temps trend about 20F cooler. Increased lake enhanced
cloud cover given cold air aloft/sharpening of mid level axis during
this timeframe. Progressive nature of positive tilted trough into
Lower Great Lakes to New England Fri/Fri night suggests relatively
short 12-18 hour window of shower chances to provide dry and
seasonable conditions with few clouds for bulk of weekend. Then
followed by thermal moderation early next week, though not near as
warm as of recent days.


.AVIATION...(For the 12Z TAFS through 12Z Wednesday Morning)
Issued at 613 AM EDT Tue Sep 26 2017

Remaining dry/VFR today into this evening with light southwest
winds and some increase in mid/high level clouds. A weakening cold
front swings through later tonight with post-frontal
cooling/saturation possibly allowing CIGS to lower into MVFR at
KSBN. Held with a more optimistic VFR fcst for now with decaying
nature of front likely resulting in a dry fropa.




LONG TERM...Murphy

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