As a large upper low swings into California...strong southerly flow is streaming into the Boise area on the upstream side of the upper trough. This flow is ushering in additional moisture but is also increasing upper level diffluence in the region. In the image below...the 12Z BOI sounding is being compared to the 12Z LAPS data (which is mostly GFS output). At 12Z, both the sounding and LAPS shows a very stable environment with positive LI's and zero CAPE.
But by 17Z...the LAPS data is showing some instability in both the CAPE and LI fields as well as an increase in Layer PW. These values coincide well with the 17Z RAP Sounding.
~Lilly Miller~
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