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<br /> <br />METEOROLOGY. HYDROLOGY, BIG THOMPSON RIVER AND CACHE LA POUDRE RIVER BASINS 39 <br /> <br />Wind observation made at 200 feet <br />above land surface <br /> <br />>J1]J17TT\> <br /> <br /> <br />~/ <br />, <br />,,,"" /- <br />~ WIND GUST TO 39 KNOTS <br />0)WIND GUST TO 41 KNOTS <br /> <br /> <br /> <br />\WIND GUST TO 38 KNOTS <br /> <br />Wind observation made at 20 feet <br />above land surface <br /> <br />~>- <br />.a: <br />"'::> <br />ZU <br />E~ '"l <br />'" "- 30.20 <br />a: 0 <br />LJ.J <br />t;:; ~ 30.10 <br />:;;::z: <br />_u <br />I-z <br />--'- <br />ex: <br /> <br />Surface dewpoint temperature <br /> <br />I- <br />i:U <br />:z: <br />Z <br />LJ.J <br />a: <br />:z: <br />ex: <br />"- <br />en <br />UJ <br />UJ <br />a: <br />'" <br />UJ <br />C <br /> <br />90 <br />80 <br />70 <br />60 <br />50 <br />40 <br />1600 <br /> <br />1800 <br /> <br />1900 2000 2100 <br />TIME. IN HOURS (MDT) <br /> <br />2300 <br /> <br /> <br />1700 <br /> <br />~: <br /> <br />1 <br /> <br />-- <br /> <br />Surface air temperature <br /> <br />2200 <br /> <br />\ <br /> <br />EXPLANATION <br /> <br />WIND-DIRECTION AND SPEED OBSERVATION. -Shaft indi- <br />cates wind direction; north is at top. Barbs on shaft indicate <br />wind speed, in knots. Long barb=10 knots; short barb=5 <br />knots. <br /> <br />FIGURE 34.-Time series of winds. altimeter setting, and surface-air and dewpoint temperatures, Rocky Flats plant near Boulder. Colo.. <br />1600-2300 MDT, July 31, 1976. <br /> <br />From Boulder northward into southern Wyoming, <br />meterological conditions were drastically different <br />from conditions south of Boulder. The trailing front <br />had moved into the foothills shortly after 1730 MDT <br />and convective clouds rapidly developed. By 1800 <br />MDT, the growing thunderstorms were detectable by <br />radar (fig. 36B), and by 1830 MDT several strong <br />thunderstorms were orientated in a north-south line <br />along the foothills (fig_ 36C). Strong easterly or <br /> <br />southeasterly winds and low clouds moving rapidly in- <br />to the foothills were observed by many residents of <br />Fort Collins, Loveland, and Longmont. Cloud bases <br />were estimated to be 7,000-9,000 feet above mean sea <br />level. Surface winds at Fort Collins and Greeley re- <br />mained southeasterly until about 2200 MDT when the <br />wind at Fort Collins shifted to the northwest. The time <br />series of meteorological data at Table Mountain (fig. <br />35) shows that strong easterly winds persisted after <br />