Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 250820

Area Forecast Discussion
National Weather Service Northern Indiana
420 AM EDT Mon Sep 25 2017

Issued at 355 AM EDT Mon Sep 25 2017

Unseasonably warm conditions will continue through Tuesday with
high temperatures primarily in the upper 80s to around 90. A
notably cooler air mass will then build into the region for the
latter half of the week.


.SHORT TERM...(Today and Tonight)
Issued at 415 AM EDT Mon Sep 25 2017

Subsident air mass within high belted warm sector regime to
provide yet another two days of benign/warm weather throughout the
forecast area.


.LONG TERM...(Tuesday through Sunday)
Issued at 415 AM EDT Mon Sep 25 2017

Little substantive change with respect to long term forecast. Lead
ejection of wester shortwave energy headed for James Bay by late
Wednesday. Trailing cold frontal zone decays with eastward
progression through the Ohio Valley yet, displacing low level
thermal ridge south towards the Ohio River Valley. This
significant northern track shortwave extrudes from the western
CONUS longwave trough and tracks well north of CWA to likely
result in a dry, yet significant midweek frontal passage and
bring thermal profiles back in check to near normal for early
autumn. Secondary shortwave dig into northern Upper Great Lakes
this weekend to provide chance shra about DY5, along with markedly
cooler air mass exchange to near/slightly below normal


.AVIATION...(For the 06Z TAFS through 06Z Monday Night)
Issued at 1250 AM EDT Mon Sep 25 2017

Dry/stable airmass on the backside of high pressure centered near
the Eastern Great Lakes will continue to ensure more VFR/dry
conditions through the TAF cycle.




LONG TERM...Murphy

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