00000nam 2200000zi 4500 9.950005 CaOODSP 20250410120717 m o d f cr bn||||||||| 250410e19531029oncd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-on En57-56/169-1953E-PDF Pincock, G. L., author. The diurnal variation of summertime rain and thunder at Rockcliffe airport, Ottawa, Ontario / by G. L. Pincock. At head of title: Local forecast study no. 24 Montreal district [Toronto] : Meteorological Division - Department of Transport - Canada, 29 Oct 53. 1 online resource (3 pages, 4 unnumbered pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier TEC ; 169 Caption title. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (page 3). "Experienced meteorologists are well aware of the fact that summer rain is more frequent at some times of the day than at others. Convective showers and thunderstorms normally occur in the afternoon or evening rather than at night or in the morning. Warm frontal rain is most frequent at night since there is a tendency for middle cloud layers to dissipate during the daytime when absorption of solar radiation incident upon the top of the cloud layer is at a maximum. These ideas are of use in forecasting. However, it is felt that they would be even more useful if a careful analysis of the times of occurrence of summer showers, thunderstorms and rain, was made. Such a study has been carried out using the Rockcliffe Airport aviation weather reports for the months of June, July, August and September, in each of the years 1950, 1951 and 1952"--Page [1]. Rain and rainfall Ontario Ottawa Diurnal variations. Thunderstorm forecasting Ontario Ottawa Observations. Pluie Ontario Ottawa Variations diurnes. Orages Prévision Ontario Ottawa Observations. Canada. Meteorological Division, issuing body. TEC ; 169. (CaOODSP)9.934253 PDF 195 KB https://publications.gc.ca/collections/collection_2025/eccc/en57/En57-56-169-1953-eng.pdf 672572425 CIR-2375