| Forecasting the Catalina Eddy - :13639 | National Weather Service (NWS)
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Forecasting the Catalina Eddy
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    The CataIina Eddy, a small-scaIe vortex in the bight of southern CaIifornia, has Iong been a serious probIem for the forecaster. It disrupts the normal stratus pattern and can cause marked cooling in the southern California coastal area. The eddy is shown to result when an eastward-moving upper trough nears southern California, with strong northerly surface winds prevaiIing along the California coast. An objective aid for predicting the eddy is presented. It was found that with a surface pressure gradient of five to ten milIlibars from 35N 125W to Los Angeles, positive vorticity advection resulting in vorticity values of seven to ten units ( I0-5 Sec-1) at Los Angeles wiII generate the eddy. Primitive equation prognostic vorticity charts are shown to be highly useful in forecasting development of the Catalina Eddy.

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