Summer Radar Echo Distribution Around Limon, Colorado

Abstract
Radar echoes for the area within 125 n mi of Limon, Colo., for the summer (June–August) months of 1971 and 1972 are examined for diurnal characteristics and relationships to the terrain. As the convective day starts, there is little daylight echo frequency until a sudden generation occurs over the east slopes of the Rockies about 1000 MST. From then until 1630 MST the frequency of echoes increases everywhere, but at the greatest rate over the Rockies, then over the east-west ridges that extend well into the plains. By 2030 MST the decreased frequency over the mountains is low enough that the maximum frequency is well over 100 n mi east of the Continental Divide. There is then decay to near zero frequencies almost everywhere by 0430 MST.

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