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This table summarizes the sonic and prop vane azimuths. Azimuth angles were shot relative to magnetic north with the datascope.

date

stn

whom

sonic (measured,magnetic)

sonic Vazimuth (calculated,true)

prop (measured,magnetic)

prop azimuth (calc,true)

notes

6/29

1

Kurt, Rus

356.3, 356.7

267.8

92.3, 92.6

273.8

 

 

 

 

 

 

 

 

 

6/24

2

Gordon, Dan

357.0

268.3

93.3

274.6

https://wiki.ucar.edu/x/R7yTB

Image Removed

6/29

2

Kurt

357.0

268.3

93.3

274.6

good agreement with 6/24

 

 

 

 

 

 

 

 

6/29

3

Kurt

353.0

264.3

93.2

274.5

 

 

 

 

 

 

 

 

 

6/24

4

Gordon, Dan

354.3

265.6

92.6

273.9

https://wiki.ucar.edu/x/RLyTB

Image Removed

6/29

4

Kurt

353.5

264.8

88.9

  270.2

prop disagrees (-3.7 deg) with 6/24

7/5

4

Dan, Kris

354.2

265.5

 

 

https://wiki.ucar.edu/x/_MWTB

Magnetic declination = 1.3 deg E

sonic: Vazimuth = magnetic measured + declination - 90

Vazimuth is the direction that the sonic V axis is pointing, and is the rotation angle of horizontal wind components from instrument to geographic coordinates.

prop: azimuth = magnetic + 180 + 1.3measured + declination + 180

prop azimuth is the angle that is added to the wind directions measured by the propvane, so that they are relative to true north.