Airbusts

[Raellus]

As far as I know, I've never seen footage of an airburst nuke detonation. Would it still kick up the signature mushroom cloud?

The PCs in my campaign are nearing Gora Kalwaria and I want to have some NPCs there describe having watched and/or felt the airbursts (or their immediate aftermath) over Warsaw from a distance- as the crow flies- of about 35km or so.

What would the concussion, heat, wind, etc. from the blasts be like at that distance? Would someone be permanently blinded from looking directly at the blast from that distance?

I want my narrative to be plausible, if not completely realistic.

Also, if any of you reading this contributed to the Siege of Warsaw thread, what was that British 6x6 amphib truck called again?

Thanks guys.