Noli, a reggeli kérdésedre a válasz (hogy légnyomás, szél, stb regisztrálva lett-e a finn -3,5°C -os gyémántporos halonál):

"The data was on the FMI site up to 24 hours after the incident, but now it is gone. Getting it now would cost.

I knew displays can sometimes occur at such temperatures. Something nucleated the supercooled droplets. The display may have been natural, there was a continuous change from the diamond dust to snow fall."