.Short Term...(Today through Wednesday) Issued at 245 AM EDT Tue Jun 15
2021  Surface analysis early this morning shows strong high pressure in
place over southern central Canada. This was resulting in cooler north
surface flow in place across Central Indiana. GOES16 shows clear skies
across the forecast area. Aloft water vapor show strong ridging in place
over the Rockies extending north into Canada. The lee side of the ridge was
allowing a NNW flow into Indiana from Canada and the upper midwest. Water
vapor showed dry air and subsidence in place over Indiana.  Today...Models
show the strong ridge in place to the west continuing to provide NW flow to
Indiana. A weak short wave is depicted to push across eastern Indiana and
Ohio today...but little to no moisture is available for this feature.
Forecast soundings through the day show a very dry column. Convective
temperatures appear to be reached late in the day...but a mid level
inversion in place along with the expected continued subsidence should just
result in a stray afternoon CU cloud. Thus will go mostly sunny today and
stick close to the NBM on Temps.  Tonight...the strong ridging to the west
will make some progress eastward to the plains...but lee side NW flow will
persist across Indiana. Subsidence looks to remain in play and Time heights
and forecast soundings continue to show a dry column. Meanwhile at the
surface strong high pressure will remain in place over the Great Lakes
spilling into the Ohio Valley. Thus again...mostly clear skies and an ideal
set-up for radiational cooling. Will trend temps at or below the NBM.  On
Wednesday...the strong ridge axis is suggested to finally arrive over the
western Great Lakes...however this will result in little overall change in
the ongoing weather across Indiana. Subsidence and surface high pressure
will remain in place across Indiana. Again...forecast soundings remain
dry...but a few afternoon CU are possible. Thus once again will trend
toward mostly sunny with temps near the NBM. 

NWS IND Office Area Forecast Discussion