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

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

0000 UTC 4 J an 2008

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

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

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