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Prevailing weather conditions have moved in today here at Oxnard, California. A second series of observations has been done at the beach to compare the artificial horizon intercepts with natural horizon intercepts. The artificial horizon set of observations reduced to an average intercept of 0.1' toward with a spread of +/- 0.3'. The natural horizon set of observations reduced to an average intercept of 0.5' toward with a spread of +/- 0.6'. This is good agreement between the two sets and confirms the Santa Ana wind dip anomaly effect observed in yesterdays observations.

Greg Rudzinski

In Search of Dip Anomaly
From: Greg Rudzinski
Date: 2013 Dec 26, 19:06 -0800
For two days now Santa Ana winds have been blowing here in Southern California. I have been waiting for these exact conditions of hot air over cold water to see if dip anomaly is present.. To check for this a series of sextant observations were made using the natural horizon which were then compared to a series of sextant observations using an artificial horizon. Intercepts using the natural horizon all fell between 3 and 4 NM from GPS. Intercepts using the artificial horizon all fell between 0 and 1 NM from GPS. It appears that 3 minutes of arc of anomalous dip is present. When prevailing conditions return then another series of observations will be made to see if the natural horizon intercepts and the artificial horizon intercepts are in better agreement.

http://en.wikipedia.org/wiki/Santa_Ana_winds

Greg Rudzinski
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