This morning's 500 mb chart shows a large closed low to the north and causing the prevailing flow to be from the NW.
Friday September 22 Bruce started REAL data collection at 0900 ODT after a 30 minute warmup.
...
Cloudless sky looking West 0930 PDT
MPD03 water vapor and backscatter profiles Sept 22
Light northerly winds with some haze, temperature in the mid 40's, no clouds. There was frost on windshields at the motel.
...
Wind field from vehicle driving to the tower array.
20:26 UTC (1:26 PM PDT) visible satellite image:
