The departure airport (MAdison, Indiana) has an AWOS-3 and there's another one 18NM to the North.
WX was 400/2.5 at time of departure, sometime after 01:00 Local time.
Uncontrolled airport with a CTAF. The WX minimums for HEMS transport programs accredited in accordance to standards in the USA are 800/2 at night for local flying areas to be defined and published in the Operators specific Operations Specifications.
If that is the case, and in view of the latest amount of flack directed to Air Ambulance transports in the USA, this guy is about to have a very prolonged and unpleasant period in his life.
Hopefully this shall be the final straw that brings everyone else back to reality with what has really been going on regarding HEMS flying in the USA.
We got a live one this time and I wish him a speedy recovery, he'll likely need excellent legal advice in court as I expect his employer to dump him like the proverbial hot potato.