Weather: Overcast and cold with frequent light to moderate showers all day, again breezy. Tomorrow should be drier, but overcast and only slightly warmer. 

Tasking:

• The morning data check showed issues with IRGA's due to rain/dew.  The only issue we noted was that the 1.5-m sonic at uconv2 (the same one we replaced on Saturday) was not reporting data. It appears to have dropped out around 0507 CDT, at which time the ldiag went to 1. We suspected this has to do with the "red LED problem" with the threshold needing to be relaxed a bit in the EC-100 box. Dan walked us through the procedure to make this change in a spare EC-100 that we planned to swap out with the troublesome one, but the CSAT had resumed reporting by the time we returned to the site. We decided to wait for drier conditions or until the sonic fails again to make the swap, but we should be all set to do so when needed.  
• Uconvm 10-m TRH is still down. This is very likely a sensor or connector issue and will have to wait until Saturday to be fixed. 

There is an IOP scheduled for tomorrow night beginning at 1800 CDT.