Morning everyone, The operational RTMA had a very difficult time capturing cold temperatures across western Wyoming this morning.  At the HADS site in Bondurant - https://www.wrh.noaa.gov/mesowest/timeseries.php?sid=BONW4&table=1&banner=off - temperatures got down to -18/-19F between 13z-14z.  Bondurant is circled in red on all three images.  And yes, the HADS site correlates very well with the COOP observer in Bondurant. #1 Obs T grid at 13Z from RIW (BONW4 -18) #2 RTMA T grid at 13Z from RIW (BONW4 +6) #3 Obs-RTMA TDiff grid at 13Z from RIW (BONW4 -24) As you can see from the difference grid, there were many other locations across Wyoming/Idaho/Utah/Colorado/Montana where the RTMA analysis was 10-15+ degrees warmer than the observations (blue areas). At this time, I haven't seen the URMA analyses or the parallel RTMA/URMA analyses. Brett McDonald RIW WY WFO - SOO