Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 210820

Area Forecast Discussion
National Weather Service Northern Indiana
420 AM EDT Thu Sep 21 2017

Issued at 100 PM EDT Wed Sep 20 2017

Very warm and dry weather will persist into next week as high
pressure remains intact over the region. Highs will be in the
upper 80s to around 90 with lows in the 60s for the next several


.SHORT TERM...(Today and Tonight)
Issued at 418 AM EDT Thu Sep 21 2017

Morning temperatures holding near to just above crossover temps
should help to preclude all but shallow/patchy fog near sunrise this
morning. Fervent ridging surface/aloft, along with thermal ridge
over central MO into southern Lower MI/east of upstream lytic
frontal boundary, to allow surface temps to rise well into 80s/lower
90s in spots.


.LONG TERM...(Friday through Wednesday)
Issued at 418 AM EDT Thu Sep 21 2017

CWA remains betwixt active Atlantic tropical storm track and deep
trof anchored over western CONUS with primarily nil sensible weather
through the forecast period. Removed egregious lake environment/
thermal bleed into land in far northwest CWA for DY2-6, especially
given background southeast to southerly flow. Leeside
cyclo/frontogenesis with formidable downstream ridging over Great
Lakes to likely lead to stalled/decaying boundaries well west of CWA
through the forecast period. Shallow frontal forced convection
potentially into CWA by DY7, though present indications for meager
instability/relatively low chance pops.


.AVIATION...(For the 06Z TAFS through 06Z Thursday Night)
Issued at 119 AM EDT Thu Sep 21 2017

Decoupling winds and clear skies may allow for some patchy,
shallow fog to develop at both sites towards morning. Maintained
MVFR vsby for a short period.

VFR conditions expected by mid morning, with cirrus from
upstream, likely decaying convection, streaming in from time to
time along with some cu during the afternoon hours.




LONG TERM...Murphy

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