|A wintery scene in the Avenues this morning|
|Frequency of lake-effect events by storm type. Based on Alcott et al. (2013).|
Last night's event was of the non-banded variety. It never developed a banded-like structure. As a result, modest accumulations were observed over a fairly broad region.
It's tough to tell from the available observations how much lake effect fell in the mountains. Alta-Collins has a 5 inch storm total since yesterday, but only about two inches fell during the main lake-effect period. The Parleys Summit SNOTEL did a bit better, with perhaps a 7 inch storm total and anywhere from 3–5 inches during the lake-effect period (the observations are automated and thus it is difficult to precisely determine accumulations).
Some lake-effect events feature dramatic enhancement of precipitation in the mountains, but the data available suggests the enhancement in this event was modest. Perhaps limiting mountain enhancement was the shallow nature of the storm. The sounding below was taken from the Salt Lake City airport around 5 am (the photo is from ~9:15 am and they are roughly overlaid to illustrate storm depth). The dramatic divergence of the temperature (red line) and dewpoint (green line) profiles at ~600 mb very clearly indicates cloud top at an altitude of about 4000 m (~13,000 feet), which is fairly shallow, although the storm may have been deeper at times.
|Sounding source: NCAR/RAL|