Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 231707

Area Forecast Discussion
National Weather Service Northern Indiana
107 PM EDT Sat Sep 23 2017

Issued at 425 AM EDT Sat Sep 23 2017

Very warm conditions will continue today with high temperatures
reaching around the 90 degree mark once again. Much above normal
temperatures will continue into the early next week as highs
reach into the middle and upper 80s. Markedly cooler air will
build into the region by midweek as a cold front moves through the


.SHORT TERM...(Today and Tonight)
Issued at 423 AM EDT Sat Sep 23 2017

Yet another day within stagnated air mass with within low level
thermal ridge over southern portion of Upper Great Lakes with
widespread lower 90s/near record high temperatures across the
region. Fervent ridging and meager lapse rates in the mid levels
over the southern Great Lakes through the period to maintain dry
airmass with large scale subsidence to offset potential late
afternoon/evening buoyant parcels.


.LONG TERM...(Sunday through Friday)
Issued at 423 AM EDT Sat Sep 23 2017

Northern portion of deep western CONUS trough to finally progress
eastward into Upper Great Lakes midweek and allow shallow frontal
zone to quell extreme/near record temperature of past few days.
Cooler airmass to become well entrenched towards weeks end as CWA
betwixt extratropical remnants of Maria and southward progressing
anticyclone of Canadian high plains origin. Timing of showers
primary forecast problem mid to late part of week associated with
mid level trof progression into Upper Great Lakes and disparate
model evolutions.


.AVIATION...(For the 18Z TAFS through 18Z Sunday Afternoon)
Issued at 104 PM EDT Sat Sep 23 2017

Sfc high pressure centered over the lower Grtlks expected to
remain nearly stnry through Sunday resulting in light e-se flow
across nrn IN. Drier air in low levels progged to advect nw into
our area tonight, which should limit br/fg development to less
than that of this morning when both SBN/FWA briefly had mvfr
vsbys. Visible imagery indicates cu field developing over central
IN/IL attm. Airmass quite warm aloft so just expecting a few
diurnal cu at the terminals.




LONG TERM...Murphy

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