Area Forecast Discussion
Issued by NWS Indianapolis, IN

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FXUS63 KIND 180347

Area Forecast Discussion
National Weather Service Indianapolis IN
1147 PM EDT Thu Aug 17 2017

The AVIATION Section has been updated below.


Issued at 339 PM EDT Thu Aug 17 2017

Low chances for rain will linger into this evening as a front exits
the area. After a dry day Friday, an upper system will bring more
chances for rain Friday night and Saturday. Look for warm and
increasingly humid conditions Sunday and Monday, before a cold front
brings cooler conditions for mid to late week along with some rain
chances Tuesday and Wednesday.


.NEAR TERM /Rest of Tonight/...

Issued at 1003 PM EDT Thu Aug 17 2017

Latest trends continue to lean toward a dry forecast for tonight,
so no changes were needed. Current forecast is on track. Overnight
lows are expected to bottom out in the low 60s (west) to upper
60s (east). Updated grids have been sent.

Drier air will move in behind the front overnight providing dry
conditions. The model blend looks good for low temperatures

Confidence is low to medium in rain chances into this evening, but
medium to high in dry conditions overnight.


.SHORT TERM.../Friday through Sunday/
Issued at 339 PM EDT Thu Aug 17 2017

Models are close enough that the model blend initialization was
accepted for most items.

Central Indiana will be in between systems on Friday, so will
continue with a dry forecast.

Friday night into Saturday an upper trough will move through the
area. An upper jet will provide additional forcing. The timing of
the system isn`t great for instability to aid in convection though.
Will keep PoPs in chance category or lower and time the highest PoPs
overnight Friday night and during the first half of the day
Saturday, based on expected timing of the system.

High pressure will then build in and keep the weather dry across the
area Saturday night into Sunday.

The model blend temperatures look good given expected conditions.

Confidence is medium in rain chances and timing through the short


.LONG TERM.../Sunday Night Through Thursday/
Issued at 339 PM EDT Thu Aug 17 2017

Models are close enough that the model blend initialization
was accepted for most items.

A flat upper ridge will nudge into the area early in the period and
should provide dry but very warm conditions through Monday evening.
With some models generating convection well to the west of the area
Monday, will have to see if any of the high clouds make it into the
area during eclipse time. At the moment though it still appears that
coverage of opaque cloud cover will be low, but of course that far
out confidence is still on the lower end of the spectrum.

An upper trough will set up across the eastern USA during the latter
part of the long term, and this will allow a cold front to move
through. Will have chances for rain Tuesday and Wednesday, but
Thursday will be dry and cooler with high pressure moving in.


.AVIATION /Discussion for the 18/06Z TAF Issuance/...

Issued at 1144 PM EDT Thu Aug 17 2017

VFR conditions will prevail for the duration of the TAF period as
central Indiana falls between two systems. Winds will generally be
west/southwesterly at 5 to 12 kts.





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