Map above shows the Tucson airport (TUS - A) and davis Monthan AFB (DMA) is indicated off to the northeast. The disance between the two observing sites is about 5 to 6 km. As I have mentioned several times in the past, the SLP at DMA is often (usually?) around 2 mb or more lower than the SLP at TUS. This would be quite a mesoscale pressure gradient if were actually there. For example, at 6 am this morning the SLP at TUS was reported as 1011.3 mb and at DMA it was reported as 1008.8 mb. Since the 6 am altimeter settings are essentially the same and the station pressures appear reasonable, the problem must lie in the reduction-to-sea-level code at one of the sites. Since TUS "fits" with nearby observing stations and DMA does not, it appears that DMA continues to routinely report erroneous sea level pressures.Tuesday, September 14, 2010
Sea Level Pressure Problems
Map above shows the Tucson airport (TUS - A) and davis Monthan AFB (DMA) is indicated off to the northeast. The disance between the two observing sites is about 5 to 6 km. As I have mentioned several times in the past, the SLP at DMA is often (usually?) around 2 mb or more lower than the SLP at TUS. This would be quite a mesoscale pressure gradient if were actually there. For example, at 6 am this morning the SLP at TUS was reported as 1011.3 mb and at DMA it was reported as 1008.8 mb. Since the 6 am altimeter settings are essentially the same and the station pressures appear reasonable, the problem must lie in the reduction-to-sea-level code at one of the sites. Since TUS "fits" with nearby observing stations and DMA does not, it appears that DMA continues to routinely report erroneous sea level pressures.
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