Precipitation at Ocean Weather Station “P"

Abstract

Abstract This paper examines the 27-yr record of precipitation measurements at Ocean Weather Station “P” (50°N, 145°W). The credibility of the rainfall observations is assessed, and the testing of certain extraordinary features of the fall and winter seasonal precipitation time series is outlined. Using the portion of the record established to be close to “ground truth” (1954–1967), the authors have statistically related present weather observations to seasonal precipitation amounts at Ocean Weather Station “P.” With this approach, the authors have reproduced the first half (1954–1967) and predicted the second half (1969–1980) of the precipitation time series to compare to observations. Precipitation is physically estimated by determining the vertical moisture convergence at Ocean Weather Station “P” and comparing the relative consistency of the moisture convergence time series to the contemporaneous seasonal rate of measured precipitation. The analysis suggests that the Ocean Weather Station “P” record o...