Area Forecast Discussion
Issued by NWS Northern Indiana

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180
FXUS63 KIWX 240437
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
1237 AM EDT Sun Sep 24 2017

.SYNOPSIS...
Issued at 150 PM EDT Sat Sep 23 2017

Very warm conditions will continue through Tuesday with high
temperatures 85 to 90. Markedly cooler air will build into the
region late week as a series of cold fronts move through the area.

&&

.UPDATE...
Issued at 820 PM EDT Sat Sep 23 2017

Expansive mid/upper level ridging persists across the region this
evening allowing for continued mid level subsidence for remainder
of weekend. A influx of slightly drier low level air via easterly
winds over the past 24 hours has resulted in some slightly lower
crossover temps in terms of fog potential tonight. Good
radiational cooling conditions once again tonight, but with lower
crossover temps and less favorable hydrolapse profiles will
continue to omit patchy fog from forecast. If patchy fog does
develop, expect it would be of limited coverage and quite shallow.

&&

.SHORT TERM...(Tonight and Sunday)
Issued at 150 PM EDT Sat Sep 23 2017

Little substantive change this period as broad ridging sfc and aloft
recenter through the ern OH valley. While low level thermal trough
holds firm...backed sfc flow continues to draw in considerably drier
air and expect to see about a cat lower dewpoints tomorrow aftn.

&&

.LONG TERM...(Monday through Friday)
Issued at 150 PM EDT Sat Sep 23 2017

Deep wrn trough will bifurcate late Mon with primary impulse lifting
out through ND as leftovers cutoff over srn AZ. Shallow/frontolytic
nature of cold frontal boundary with ewd extent not to mention
timing bodes little support to continue with low chc pops and will
drop with this fcst cycle.

Secondary sw trough follows and sharply amplifies sewd through the
wrn lakes Fri with a more substantial cold push lingering into Sat.
Will follow the blend here wrt pops esp up near lake MI as
substantial lake aggregate trough expected to develop supporting a
good chance for lake effect rain showers particularly Fri night into
Sat morning. Will generally undercut temps DYS7-8 given GFS/EC 850
mb temps crashing to near 0C and quite the contrast to todays 20C
temps.

&&

.AVIATION...(For the 06Z TAFS through 06Z Sunday Night)
Issued at 1236 AM EDT Sun Sep 24 2017

VFR/dry with light ese winds under high pressure through the TAF
cycle.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...NONE.
OH...NONE.
LM...NONE.
&&

$$

UPDATE...Marsili
SYNOPSIS...T
SHORT TERM...T
LONG TERM...T
AVIATION...Steinwedel


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