Tower gave Envoy 4125 braking action medium to poor. Wind was 360 at 17 knots gusts to 24 in the tower landing clearance. If they were really going for P4 it is away from the terminal to the right and the plane left the runway to the left. Perhaps they weathervaned into the north wind as the plane slowed down on the slick runway.

https://cimg0.ibsrv.net/gimg/pprune....405889da90.jpg
In the video you can see the plane departing the runway to the left prior to the 8 thousand feet remaining and P4 taxiway signs. Were they trying to exit N1 perhaps?

If I'm reading above chart correctly, P4 extends to the left of 10L too. If that is so, then they were indeed making a left turn into P4. Looks quite a tightish turn in slippery conditions. Might have been better to continue to N3.

Edit: In fact that left turn is N1. Missed that somehow.

It's a case of 'find the faces in the picture' but I think the pavement on the other side of the runway from P4 is N1. N2, N3, N4 and N5 are also on the north side of 10L.

Agreed Airbubba and I did make an edit pointing out that I'd failed to see it. (Poor observation skills) :)

Thanks Ivor, the circumstances I know, they didn't groove the runway I believe. The point was the spoilers retract when the wheels lock up I seem to recall. Never flown them myself.

I've watched the video over and over and got the impression they were way too fast to even consider a turn off to the nearest taxi way.

Thrust reversers
 

An optional extra on the 145

I think (not certain) the TRs can be heard on the pax video.

Perhaps a bit of downwind thrust vector pushing the tail out

My impression from the video is that the aircraft acquired a slight left drift after touchdown, followed by a drift right almost to the right runway edge, followed by the left ground-loop (a bit hard to be sure with snow-covered markings and bare strips). Appears to have collapsed at least the right main gear in the final sideways skid (judder-judder-judder-Bam!), causing the wing drop.

See pictures at AH: Accident: Envoy E145 at Chicago on Nov 11th 2019, runway excursion on landing

A tough day at the office - looking forward to more details. Shades of Continental 1404 in Denver (2009) - localized wind gust(s) outside the detected range?

I do not think this was an attempt to make an exit.

To be honest, it looks like a complete loss of control on ice. A good crosswind for sure. I see in the weather reports that the temp was -4 but you can see with the multiple reports that it is dropping fairly quickly even though it was morning where the temp might be steady or increasing soon.

This has the hallmarks of a cold front coming through a few hours earlier and what the local papers around here call a flash freeze. The temperature was a few degrees above freezing with a wet runway, perhaps some drizzle. Then the cold front hits with strong winds and snow which initially melts, then starts to freeze creating ice. Snow continues as we can see and it looks like snow over pavement but it is ice or ice patches below. Reminds me of the AC 767 that lost control in Halifax last winter.

Monitor the weather and beware of flash freezes. Looks like a situation where a diversion would be a good idea. Or let someone land in front of you and get a pirep. Early morning arrival after an overnight cold front passage.

From a controllers point of view.... oups.... runway closed for some time.

With the number of operations, and adding in winter conditions, this is what happens sometimes, and the reason safety zones are established.

On another note, I've been doing run ups on the runway, which is normally an absolutely nono... simply because the conditions on the taxiways and aprons didn't allow for it.... aircraft would start skidding when adding power. I've even seen slow taxiing aircraft being swung around in gusty conditions (the conversation was rather fun afterwards).

I wonder why they elected the runway with the most cross wind component, during slippery runway conditions, when the airport has plenty of other options? Is it only runway 10/28 that offers landing aids for low ceiling/visibility?

Wind 360/17g24 on rwy 10 with braking action Med-poor? Is that really true? Because for that there would be only one word: cowboys!

On my type it would be way out of limits (limit for med would be 20 cross).
Anyone the croswindlimits for that type?

The crosswind component was well over the limit for my company on any aircraft with a reported runway condition of medium to poor.