Sad. The aircraft departed ANB at 2243z, the initial approach to UIN commenced about 8:49p lcl (0249z) and the accident happened 59 minutes later, at 9:39p lcl (0339z).
Interestingly, I63 15nm to the east was reporting clear until after 10:30p lcl (0430z), also has an RNAV LPV approach. Anything north and east was better - MQB, BRL, IJX, even PIA and SPI. PPQ was about the only one working away from the approaching weather that wasn’t VFR.
Doing a little deep dive, working backwards: the 5pm (23z) forecast discussion out of the St Louis WFO was not great, literally called out UIN specifically for these potential conditions ahead of WAA associated with an approaching trough. That’s around the same time the 2330z TAF was issued, which got it right, but was issued an hour after departure.
Going back to the earlier 2:25p (2025z) FD and 11:00a (17z) TAF discussions (which resulted in the 1723z TAF issuance), these were more optimistic, but still mentioned the southerly flow bringing in low stratus. It was probably a matter of intensity and timing - as the afternoon wore on the forecast got worse and worse, earlier.
Also looking back to the graphical charts at about 20z (2.5 hours prior to departure), IFR and MVFR ceilings and vis were forecast for UIN and PPQ, respectively, starting at 01z, then dropping to LIFR and IFR at 02, with both airports (and now also I69) LIFR at 03z - a general northeasterly progression ahead of the front. Actual observed conditions, several hours later, ended up being almost exactly what had been forecast there.
I’m posting this to illustrate how much can change in the usual 6 hours between TAFs and why TAF alone isn’t an end-all, be-all indication. It’s not unusual for things to change in the ensuing time between a forecast and departure (in this case it was 5 hours) and arrival (9-10 hours after the 1735 TAF). There are lots of additional, timely resources that can augment decision making and perhaps as importantly, bigger-picture indications of what is driving those changes (or even the uncertainty involved) that might be worth considering. Maybe they did consider that, who knows, just sayin’.