What does "With One Minute Weather" Mean?
It's used at uncontrolled airports to tell approach controllers that you've got the AWOS/ASOS there. I believe the tower at KMCC is temporary (probably for firefighting).

The AIM 4-3-26 is snappily titled Operations at Uncontrolled
Airports With Automated Surface Observing System (ASOS)/Automated Weather Sensor System(AWSS)/Automated Weather Observing System (AWOS), and says:


  If ATC service is required for IFR/SVFR approach/departure or
  requested for VFR service, the pilot should advise the controller that
  he/she has received the one−minute weather and state his/her
  intentions.
  EXAMPLE− “I have the (airport) one−minute weather, request
  an ILS Runway 14 approach.”


It's also in the Pilot/Controller Glossary:


  ONE-MINUTE WEATHER− The most recent one minute updated weather
  broadcast received by a pilot from an uncontrolled airport
  ASOS/AWSS/AWOS.


And this from the ATC Orders 5-10-2:


  Automated weather observing systems may be set to provide one minute
  updates. This one minute data may be useful to the pilot for possible
  weather trends. Controllers provide service based solely on official
  weather, i.e., hourly and special observations