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Impacts of West Coast Extratropical Cyclone Cameron (3-5 January 2008)

This study examines the impacts of the 3-5 January 2008 West Coast extratropical cyclone on Northern California. It provides a synoptic history, methodology, and assessment of terms for analyzing the storm.

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Impacts of West Coast Extratropical Cyclone Cameron (3-5 January 2008)

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  1. 3-5 January 2008 West Coast Extratropical Cyclone Cameron G. Loughlin San Francisco State University

  2. Outline • Impact of Storm on Northern California • Synoptic History • Methodology • Assessment of Terms • Discussion Cameron Loughlin Quasigeostrophic Effects of 3-5 January Cyclone

  3. Impact of Storm on West Coast • Record-setting wind speeds • Rapid Decline in Pressure • Heavy Precipitation Cameron Loughlin Quasigeostrophic Effects of 3-5 January Cyclone

  4. Outline • Impact of Storm on Northern California • Synoptic History • Methodology • Assessment of Terms • Discussion Cameron Loughlin Quasigeostrophic Effects of 3-5 January Cyclone

  5. Outline • Impact of Storm on Northern California • Synoptic History • Methodology • Assessment of Terms • Discussion Cameron Loughlin Quasigeostrophic Effects of 3-5 January Cyclone

  6. Synoptic Overview • Cyclone formed south of Aleutian Islands on 3 January • Low Developed over North Pacific Ocean on 3 January • Minimum Central Pressure of 956 mb • Low advanced into Northern California on 4 January bring heavy rain and strong winds Cameron Loughlin Quasigeostrophic Effects of 3-5 January Cyclone

  7. Outline • Impact of Storm on Northern California • Synoptic History • Methodology • Assessment of Terms • Discussion

  8. Methodology - Quasigeostrophic (QG) Omega Equation LHS: Omega RHS: Vorticity advection, temperature advection • Sutcliffe Petterssen Equation (SPDE) LHS: Relative vorticity tendency RHS: 500 mb vorticity advection, 1000 mb horizontal temperature advection

  9. Outline • Impact of Storm on Northern California • Synoptic History • Methodology • Assessment of Terms • Discussion

  10. Assessment of Terms • Cyclone will be examined at 3 different times at 4 January 0Z, 4 January 12Z and 5 January 0Z • Analyze maps using QG Omega Equation Terms and SPDE

  11. SPDE 4 Jan 00Z Terms: • Weak absolute vorticity advection • Positive Relative vorticity tendency • Warm advection • Pressure Change: • 976 mb. 12 UTC 3 Jan 2008 • 964 mb. 00 UTC 4 Jan 2008

  12. 0000 UTC 4 J an 2008

  13. QG Omega 4 January 00Z • San Francisco • Negative omega • Strong negative vorticity advection • Weak warm advection • Dominating Term: Temp Advection

  14. Outline • Impact of Storm on West Coast • Synoptic History • Methodology • Assessment of Terms • Discussion

  15. Quasigeostrophic Assessment • Quasigeostrophic Assessment at 00Z 4 January, 12Z 4 January and 0Z 5 January for the following: • Temperature Advection • Differential Vorticity Advection

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