Beginning around 21:25 UTC on Thursday July 20, the ISS will be broadcasting SSTV images (using SSTV Mode PD 120 or PD 180) to commemorate the 20th anniversary of ARISS.  SSTV images will be sent at 145.80 MHz FM using the highest power radio and best antenna in the ISS.  Signals are so strong that typical external antennas will have no issue producing S9 signal levels.  The event is expected to continue over a 2 day period.

If you have a soundcard interface of some kind for your FM radio, you can use a free software program called MMSSTV, which can be downloaded here: http://hamsoft.ca/pages/mmsstv.php

A lot of good information on using MMSSTV with the ISS SSTV signals can be found on the ISS Fan Club page here:  https://www.issfanclub.com/node/9802

Another reference can be found here: https://amsat-uk.org/beginners/iss-sstv/

The next several days of ISS passes over our area are shown below (times in UTC, so subtract 4 hours for local time — the first pass over our area after the event start is Friday July 21 at 02:56 UTC, which is actually 10:56 PM on Thursday July 20):