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The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease
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THE OLYMPIC MOUNTAINS EXPERIMENT (OLYMPEX).

Robert A Houze1, Lynn A McMurdie1, Walter A Petersen2

  • 1University of Washington, Seattle, Washington.

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Summary
This summary is machine-generated.

The Olympic Mountain Experiment (OLYMPEX) studied Pacific storm precipitation changes over coastal mountains. Findings clarify how orographic effects influence rainfall and snowfall patterns.

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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Hydrology

Background:

  • Pacific storms are a primary source of precipitation for the Pacific Northwest.
  • Coastal mountain ranges significantly influence weather patterns, a phenomenon known as orographic effects.
  • Understanding precipitation modification is crucial for water resource management and flood prediction.

Purpose of the Study:

  • To investigate the impact of coastal mountains on the microphysical properties of Pacific storms.
  • To quantify changes in precipitation type and intensity as storms traverse the Olympic Mountains.
  • To improve precipitation estimation and modeling in mountainous regions.

Main Methods:

  • Deployment of advanced weather radar systems (e.g., NASA's D3R) for detailed precipitation observation.
  • Utilization of aircraft-based instruments to sample cloud and precipitation particles.
  • Integration of ground-based measurements, including rain gauges and snowpack analysis.

Main Results:

  • Observed significant reduction in liquid precipitation and enhancement of snowfall on the windward slopes.
  • Identified specific microphysical processes responsible for precipitation transformation.
  • Validated satellite-based precipitation estimates against in-situ measurements.

Conclusions:

  • The Olympic Mountains exert a strong orographic influence, altering storm characteristics significantly.
  • OLYMPEX data provides critical insights into precipitation processes in complex terrain.
  • Results enhance the accuracy of weather models for mountainous regions.