Synoptic climatological studies of precipitation in the plateau states from 850-,700-, and 500-millibar lows during spring
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Synoptic climatological studies of precipitation in the plateau states from 850-,700-, and 500-millibar lows during spring

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    The synoptic climatology of precipiation over the Plateau States or intermountain region of the western part of the United States during spring, associated with 850-, 700-, and 500-mb Lows is derived using 12-hr precipitation amounts (expressed as a percent of the 7-day normal) for 13 yr at 157 stations. The precipiation is initailly related to nearby Low centers through a computer grid system of moving coordinates, resulting in precipitation patters around each Low. The precipitation at each selected station is also related to the same set of coordinates, reulting in precipitation patterns around each station. The upper Lows are grouped into three intensity classes according to the departure from normal of their central heights. The average occurrence are derived and related to the level, intensity, and location of the upper Low. Probabilities of precipitation from each upper Low are derived from 35 stations. The use of the derived charts as forecast aids is discussed. The geographical distribution of the upper Lows is shown for each level. It is found that precipitation appears to be specified best by the most intense Lows at the 700-mb level and that the spring season data differ significantly from those of the winter season. Considerable variability is shown to exist among several stations.
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