Yesterday the afternoon was cloudy and rain showers occurred upwind of the site after 4 PM (20 UTC), with a few of them passing over the site as seen by the cloud radar. These clouds had tops near 2-3 km. The lidar images have shown that this rainfall caused a wash-out of aerosol in air masses passing over the site during the hours after that.
After 20 UTC (note the vertical black line indicating that the lidar shut down because of a rain event) the attenuated backscatter at 1064 nm as well as the particle backscatter at 532 nm show much weaker signals/returns between 1 km and the surface, indicating lower aerosol concentrations there (below cloud base).
I have seen the same a few days back, on the 12th of November near 15 UTC (the image is included in a previous post).
