6 June   duration of convection note  Ken Davis

Hypothesis from IHOP:  Convection persists longer into the afternoon
after cold fronts pass.  Seems to be the case from the observations(?).
This may be due to the land surface being warm from previous warm days.
It takes longer to cool down than the air, so immediately after a front
the warm land surface keeps convection running longer into the afternoon.
After a few warm days, the land has warmed up and convection shuts
down earlier in the afternoon since the land-atmosphere temperature
difference reaches ~0 earlier in the day.

I don't know if I believe this, since the heat capacity of dry land
isn't great (wet land?), but the 6 June mission (King Air and Falcon)
intended to extend their flights into the early evening to watch the
ABL collapse, and this didn't happen by the time they quit (around
18 CDT I think).  Other missions (warmer days) saw convection quit
earlier (word of mouth).