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<br /> <br />, / <br />1500' ./''''...AOOO <br />, /- <br />\ ,/'./ <br />,,/' " <br />y , <br />lO~OO',-. RustiC."';' \ <br />\, u _ ...,...' \..~_, 1 <br />,(~Q;;-~'5 \ \ <br />\ ",'6~/" '\' <br />~<:-;I '--) Glen ,,- <br />,f/ /Jjl'enl rak <br />(,-::;1 ,/ 0/ : <br />~? / Eli. "r! <br />/ Grand ',- I'lIrk ' <br />I L~l<e .......\l!' <br />. ", <br />, " <br />1M eklf\ \ <br />') rk \ '. T <br />, I I t <br />',ranbv /vard' I <br />. " , <br />" Boulde <br />Na~rland " ~ <br />(~. \.. JejJ.co \ <br />)) ': ~kV --... <br />...... C8I1tral /.,)"F~ts tl <br />/"f 'Clty f ' <br />/:t:' \1'" oDe <br />-- I \ r.> Engl!$w~ <br />"I \ Q.,ergr \, Airport) <br />I _ /(!!J) \ " , <br />,'" ---- f' " .' <br />)/ _~ _ P' '\. 5l!dalia <br />/- / ' ~, Ballev ,ne '...... "I <br />//' \ ""-',,' ,'~' / \ ,~ \,,-- . ~~c <br />10000' 10000' " './ / " \ '--- <br />, \ '-...... / ,\ " <br />I \ ) / ~eckefs " \" <br />", I I,' \. '" <br />I , I ", l / ,/ \, Llrkspur <br />111km2U 30 "',) l/ 75'00' <br /> <br />G~end"vey <br /> <br /> <br />5JEO' <br />./ <br />,'-----------~- <br /> <br />.Windso' <br /> <br />)el!V <br /> <br />, <br /> <br />," <br /> <br />----,'-, <br />-"--- <br /> <br />'Br;g~lon <br /> <br />____o,Elbert <br />" <br />7000' <br /> <br />a <br /> <br /> <br />G~end9.ey <br />l~OO',... <br />\, U <br /> <br />............:.6006'--------' <br />/ / <br />/ , <br />/ ,/ <br />\ <br /> <br />5000' <br />---,--- <br /> <br />)e9liV <br /> <br />G~anbv <br /> <br />...,'-,----, <br /> <br />~"~--- <br />5000' <br /> <br />1'0 2'03b <br />'m <br /> <br />_Elb!rt <br />, <br />7000' <br /> <br />b <br /> <br />Figure 31. Local scale surface analyses. Frontal positions and reported winds are in black; Limon <br />radar echoes are shown with VIP Levell return shaded gray, level 2 shaded orange, and level 3 <br />shaded black. (a) 2330 GMT, 31 July 1976. (b) 0000 GMT, 1 August 1976. <br /> <br />while the western portion moved over the <br />foothills southwest of Boulder. Rainfall <br />amounts, however, were much less than <br />those observed 20 to 80 mi to the north. <br />~10reover, the echoes west and south of <br />Boulder moved westward almost to the <br />Continental Divide, indicating that they <br />were not strongly affected hy the terrain. It <br />seems likely that the trailing front became <br />quasi-stationary between Denver and the <br />foothills south of Boulder; therefore the <br />very moist, unstable air probably did not <br />reach the elevated terrain southwest of <br />Boulder. <br />From Boulder northward, meteoro- <br />logical conditions were very different. The <br />trailing front had moved into the foothills <br />shortlv after 2330 GMT, and convective <br />cloud~ developed very rapidly. By 0000 <br />GMT a few echoes were detected by radar, <br />and by 0030 GMT several strong thun- <br />derstorms were oriented in a north-south <br /> <br />36 <br /> <br />line along the foothills. Many residents of <br />the Ft. Collins, Loveland, and Longmont <br />areas reported strong easterly or southeast- <br />erly winds and low clouds moving rapidly <br />into the foothills. Cloud bases were esti- <br />mated to be at 7000-9000 ft MSL (2.2-2.7 <br />km). Surface winds at Ft. Collins and <br />Greeley remained southeasterly until <br />around 0400 G:\<IT after which the wind at <br />Ft. Collins shifted to the northwest. The <br />time series at Table Mountain shows that <br />strong easterly flow persisted ,uter passage <br />of the trailing front with a maximum east- <br />erly component exceeding 20 m s-1, 400- <br />600 m above the smface. The surface east- <br />erly flow was temporarily interrupted <br />around 0100 G:\<IT by a shallow region of <br />westerly winds. This was probably weak <br />outflow from the large cell located a few <br />miles to the west of the site. <br />Using the afternoon rawinsonde data <br />from Sterling, Denver, and Grand Junction <br />