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<br />". <br />I ......, J \. <br /> <br />J <br />J <br />,. <br />./ <br />.r . <br />E.~Ferne' <br />r.;:mfi=lll I <br />(i:::ool'etal} ~ <br />pattern <br />\ <br />.~ <br />\ <br />, I <br />J <br /> <br /> <br />go:. <br /> <br />) ~~~~~I.~~nJd IN. i~, <br />4(1..90 degj".ee~ <br />I tQ ri!lllht of <br />/ cl 00 !:I layer winds <br /> <br />. ~ <br /> <br />IGMrl'YCteeK Bas,1n - ~ <br /> <br />CIOtIdllav-er Win. <br />(~. or - Ul dra~rB9s) <br /> <br />Figure 2 Observed relationships of cloud layer and sub-cloud layer winds to the rainfall pattern. The outline of the <br />386 square mile Cherry Creek basin is shown for reference. <br /> <br />Since the Cherry Creek: basin is oriented roughly north-south as shown in Figure 2, the <br />extreme storm events that align with the basin orientation have southerly cloud layer winds and <br />southeast to east sub-cloud layer winds. By comparison the NWS study specifies northerly sub- <br />cloud winds. For northerly sub-cloud wind directions, Figure 2 should be rotated 45-90 degrees <br />to the left to provide a "physically possible" scenario. This rotates the rainfall pattern from its <br />most stressing position aligned with the basin to a cross-basin pattern that reduces the volume of <br />rain within the basin boundaries dramatically. The combination of the NWS study rainfall <br />pattern aligned with the basin with northerly sub-cloud winds is not consistent with Colorado <br />extreme storms. The A W A team study also aligns the rainfall pattern with the basin but relies on <br />southeast to east sub-cloud winds. <br />