A study was made of winter temperatures t o determine the frequency of chinook days i n Alberta. The resulting pattern shows a maximum frequency along a l i n e j u s t e a s t of the front range of the mountains, with the frequency decreasing slowly eastward. But a careful analysis of the Calgary-Red D e e r -D d e l l e r triangle shows t h a t the frequency i s influenced by l o c a l topography and t h a t the warm a i r a t times overrides a pool of cold a i r i n a valley t o appear a t high elevations t o the e a s t .
ABSTRACT. Observations of the snow depth at 2 [ sites at R esolute were made twice weekly during the winter of [957-58. As a result of these observations, and of other observations on snow made for the National R esearch Council, it is shown that the snow depth and the water content of the snow did not continue to increase during the winter as the snow fell. Rather the strong winds eroded the snow surface and the increase in depth was irregular and relatively slow. Furthermore, the observations on the density of the snow cover lead to the conclusion that attempts to measure the density in similar regions with an accuracy greater than ± 0'05 g. cm. -3 are not warranted. RESUME. P endant l'hi ver [95 7-58 on a pris des mesures deux fois par semain c de I'epaisseur de la neige it 2 [ endroits it Resolute. Par suite de ces observations et d'autres observations de la neige faites pour le Consei l National de R echerches, on a pu montrCl" que I' cpaisseu r et la va le ur en eau de la neigc n'allaicnt pas croissant pendant I' hiver au fur et it mesure dcs precipitations. Il sem ble plut6t que des , 'e nts fo rts ont e rod e la surface de la neige cle sorte que l'epaisseul" s'augmentait de maniere irrcgu liere et rclativcm ent len te. D e plus, des observations de la densite de la couche neigeuse laissen t cO:1clurc qu'aucun essai de mCSUl"C cle la densite clans des r egions analogues it un clegre cle precision supericul" it ± o,5 g cm-3 ne puisse etrc valablc.
ZUSAMMENFASSUNG. Beobachtungen d er
A study is made of the usefulness of four different measures of the relative variability of precipitation. It is discovered that the two measures, the difference between the extremes divided by the median, are subject to too great, fluctuations in sampling to be satisfactory. There is little to choose between the two measures, the mean deviation or the standard deviation divided by the mean. Even with these measures, the fluctuations are sufficiently large so that a period of 30 years is desirable before computing them. It is further shown that the standard deviation divided by the mean varies slightly with mean precipitation but, in spite of this. it is a satisfactory measure with which to compare variability of precipitation in different localities. 111 112. ; MONTHLY WEATHER REVIEW JULY 1952 dance'and drought. ' "Relative measures of precipitation variability have been computed in order to derive comparable figures. There are four of these, corresponding to the four measures of variabilit,y. They are: the coefficient of variation, v -"" CT the relative variability, or=-m. d. M and Q -Medzan Range Median.
VQ=-
British Columbia
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