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John D. Horel, David Myrick, Mike Splitt*,
Steven Lazarus**, Lacey Holland***, Alex Reinecke**** |
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Department of Meteorology |
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University of Utah |
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jhorel@met.utah.edu |
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* Telecommuting from Florida |
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** Florida Institute of Technology |
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*** NCEP |
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**** University of Washington |
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Cold Pool Structure |
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Clements, C., 2001: Cold Air Pool Evolution and
Dynamics In A Mountain Basin. M.S. Thesis. University of Utah. 100 pp. |
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Clements, C., D. Whiteman, J. Horel, 2003: Cold
pool evolution and dynamics in a mountain basin. Submitted to J. Appl.
Meteor. |
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Climate in Salt Lake Valley and other Basins in
the West |
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How well can MesoWest observations define local
microclimates, e.g., diurnal temperature range? |
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IOP-2. 6-7 October |
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Holland, L., 2002: Downslope Windstorms Along
the Wasatch Front. M. S. Thesis. University of Utah. 86 pp. (copies available) |
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** Horel, J. and L. Holland, 2002: Downslope
windstorms along the Wasatch Front. Manuscript in preparation. |
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Data Assimilation in Complex Terrain for other
IOPs |
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Lazarus, S., C. Ciliberti, J. Horel, 2002:
Near-real time applications of a mesoscale analysis system to complex
terrain. Wea. Forecasting. In press. |
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Sensitivity to analysis methodology: overcoming
systematic analysis errors in complex terrain |
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Complex interactions between stable boundary
layer and synoptic-mesoscale forcing |
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Well-developed radiational inversion in Salt
Lake Valley |
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Cold pool over Wyoming approaching Wasatch |
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After 10:30 UTC: |
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Bora-type surface winds confined to narrow region along
northeast bench |
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Jet emanating from northeast corner of SL Valley
above cold pool |
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Stagnant conditions in downtown SLC |
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1 km horizontal resolution incorporating all
available observations collected during IOPs |
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Analysis = Background + Correction |
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= RUC-2 + S weight x
(observation – background) |
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Biases: |
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Surface observations on slopes/peaks affecting
free atmosphere above valleys. Developed “terrain weighting factor” |
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Analyses too smooth in horizontal and vertical. Reduced
horizontal and vertical radii of influence |
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Surface observations from adjacent valleys
affecting analysis. Developing “anisotropy weighting factor” |
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Mass/wind fields not constrained to be
dynamically consistent. Developing variational constraint on wind field |
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Fully implement anisotropy factor into ADAS |
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Analyze spatial and temporal evolution of
boundary layer during IOP-8 at 1 h
intervals on 1 km grid using all available data |
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Use analyses to initialize simulations of IOP-2
and IOP-8 |
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Analyze other IOPs as time permits |
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Continue development of variational wind
constraint |
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