National Weather Service Raw Text Product

007 
FXUS63 KIWX 191850
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
250 PM EDT Sat Aug 19 2017

.SYNOPSIS...
Issued at 250 PM EDT Sat Aug 19 2017

High pressure will provide fair weather into tonight and Sunday,
with lows near 60 degrees tonight and highs in the 80s tomorrow.
More humid conditions are expected on Monday with low chances for
afternoon thunderstorms west of Interstate 69. A cold front will
swing through later Monday night into Tuesday with chances for
several rounds of showers and thunderstorms. Cooler and drier air
then filters in behind this system Wednesday through next weekend. 

&&

.SHORT TERM...(This Evening through Monday)
Issued at 250 PM EDT Sat Aug 19 2017

Subsident west-northwest flow will allow surface ridging to drift 
through the region late this afternoon into tonight ensuring 
dry/mostly clear conditions. Sunday into Monday will feature a brief 
transition to high latitude/quasi-zonal flow. Low level flow will 
veer more southwesterly during this time promoting gradual 
moistening/warming, especially by Monday when airmass becomes 
moderately unstable. Will have to watch the slow eastward 
progression of upstream convection on Monday as low 
amplitude/convectively aided shortwave energy emerges on southern 
fringe of westerlies. Outflow from this feature could generate some 
convection into nw IN/sw Lower MI mainly into Monday afternoon, 
though kept PoPs low as main frontal zone develops into the Upper 
Midwest/Western Great Lakes.

&&

.LONG TERM...(Monday Night through Saturday)
Issued at 250 PM EDT Sat Aug 19 2017

Chances for rain/storms increase Monday night into Tuesday/Tuesday 
evening as another seasonably strong upper trough digs southeast 
into the Great Lakes. Ample moisture transport near the associated 
cold front and/or pre-frontal trough/outflow, combined with the 
potential for lead convectively induced waves to translate through 
in strengthening wsw flow, support going mid chance to likely PoPs 
(several rounds of rain/thunder). There remains some potential for 
strong/severe convection Tuesday afternoon given increasing 
flow/forcing aloft over moist/unstable surface conditions, though 
where/when convection is more active (near possible composite 
outflow or along main front?) remains uncertain at this fcst range. 
Expansive high pressure then builds in post-frontal mid week through 
next weekend on the subsident southwest periphery of an Eastern NOAM 
longwave trough. 

&&

.AVIATION...(For the 18Z TAFS through 18Z Sunday Afternoon)
Issued at 100 PM EDT Sat Aug 19 2017

VFR conditions this period as sfc ridge drifts east across the 
terminals. While some penchant for MVFR based restriction in br may 
exist late tonight within sfc ridge axis will omit at this time 
given early morning rainfall missed the terminals entirely.

&&

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

$$

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


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