Tuesday, January 15, 2019
Weather Synopsis:
Persistent cold-air pool
forecast valid Tuesday 01/15/2019 7:00 pm MST
This will be updated every other day unless conditions warrant.
Summary: A weak storm system will clean out the remaining pollution Wednesday. A windy and wet pattern will ensue through Thursday night with several feet of snow in area mountains as a a strong Pacific storm system traverses the Western US. An inch or two of snow is possible in the Valleys Thursday night into Friday morning. A short 60-hr cold-air pool episode is forecast Friday afternoon through Sunday night followed by a cold front and mix-out to clean conditions late Sunday night or Monday morning. PM2.5 Pollution levels will stay below the NAAQS on Saturday and Sunday. Cool, clean northwest flow will follow into Monday and Tuesday.
Wednesday 16 January:
Remaining pollution from last episode will be mixing out by mid-afternoon. 70% chance of rain and snow mix. Winds 5-10 kts from south.
Remaining pollution from last episode will be mixing out by mid-afternoon. 70% chance of rain and snow mix. Winds 5-10 kts from south.
High 40 F Low Wednesday night 37 F
Thursday 17 January:
Clean air in Utah Valleys. Rain likely (90% chance), heavy at times. Too warm for Valley snow accumulation in the Salt Lake Valley until late Thursday night with 1 inches possible toward dawn Friday. Winds 5-10 kts from south.
Clean air in Utah Valleys. Rain likely (90% chance), heavy at times. Too warm for Valley snow accumulation in the Salt Lake Valley until late Thursday night with 1 inches possible toward dawn Friday. Winds 5-10 kts from south.
High 46 F Low Thursday night 33 F
Friday 18 January:
Clean air in Utah Valleys. Snowshowers likely (70% chance). 1-2 inches possible.
High 37 F Low Friday night 30 F.
Weak pollution episode begins with cold-air pool conditions being established.
High 37 F Low Saturday night 26 F.
Forecast model inversion sounding late morning Saturday showing descending mountaintop subsidence inversion associated with progressive short-wave trough:
Weak pollution episode continues through Sunday night. PM2.5 levels likely to remain below NAAQS.
High 40 F Low Sunday night 29 F.
Forecast
model inversion sounding in the morning Sunday showing the mountaintop subsidence inversion has descended and the low-level inversion has strengthened:
At this time (weather models could change) another cold front will end the short weekend episode with a chance of snow. Stay tuned.
High 38 F Low Monday night 25 F.
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