This incident occurred about 2 hours prior to sunset with visibility 1 1/4 SM and ceiling overcast 3,000.
It appears this would be a loss of separation but what is the separation standard for this circumstance; i.e., two IFR aircraft, IMC, Class B, tower control? Recall during the KAPA Metro/Cirrus midair discussion, there was considerable squabbling about just what a tower does or doesn’t provide, with the basic mission being runway separation and airborne sequencing, but that circumstance was Class D, VMC.