.Short Term...(This evening through Thursday night) Issued at 255 PM EDT
Wed May 12 2021  Model data suggest a quiet and dry period can be expected
across the area. A large surface high pressure area currently over the
Great Lakes will sag south into the Ohio Valley by Thursday night. Deeper
moisture will be tied up farther south, closer to the main branch of the
jet stream.  A good radiational cooling setup is expected tonight, given
the clear skies, low humidity, and light winds due to the center of the
high pressure area drifting overhead. Temperatures may drop low enough in
the normally cooler low lying areas for frost formation by early Thursday
morning, however at this time it appears most areas won`t get cold enough
for widespread frost.  Decided to nudge down the GFS MOS lows tonight a
bit, based on above. Otherwise, the guidance temperatures look good through
the end of the period. 

NWS IND Office Area Forecast Discussion