How Contrail Form into Milky Opaque Sheets

Yesterday was a full day of persistent to spreading cirrus aviaticus clouds (contrails).  As the first line of east to west air traffic traversed through our Central Wisconsin Flyway, horizon to horizon trails began to form from the water vapor attaching to cloud condensation nuclei (CCN) from the jet exhaust at an altitude between 32000-36000'. From flightradar24

Moist air continued to push in from the southwest following the pattern of the last 4 days, forming a boundary line (sheet) roughly along and beneath the regular air traffic pattern. From Infrared Map Site

Infrared

Moisture  From NOAA Water Vapor Site

At that time 7:30-8:00 AM CT the high cirrus were moving through the Flyway as the air mass slowly spread to the north.  

From the northern edge of the east west weather and air traffic pattern looking south:

Looking North of the Flyway:

By 9:30 AM the boundary line with both natural and aviaticus cirrus clouds drifted north and this continued throughout the day.

Looking East as Thin Clouds Drift Past the Flyway Going North.  A typical view seen most of the entire day.

As the cloud cover progressively thickened (optical density OD) from a combination of natural clouds and the boundary sheet area of the flyway which by then had been striped with many additional persistent clouds,  a sort of nuclei and moisture saturation occurred and typical for this type of event a sun dog formed from the natural and cirrostratus aviaticus ice clouds.

Looking South into the Flyway 11:00 AM

Note: Even NASA's Rapid Update Cycle RUC Map below, based on the Appleman Chart got this one right.

The 3 yellow circles across the center of the Wisconsin Flyway were a predictor of contrail formations:

http://theorioninitiative2.blogspot.com/2015/04/massive-day-long-contrail-event-of.html