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<br /> <br />", '1f;'^" :..., "...',',' ".:' .. "pt;. ,,""..',... .'" -..; ,~t '.' '... " ", ,)if '"' ,.2;' {.! <br />Figure 22. '5OQ'rnb.;tnalysis fclrQOOO GMT:l~August 1976. ReIer to legend 01 Fig'..6for details., <br />',..(.~:, ',. " ',' ' ' , '..' '1IG ....' ....' .'.,. , " . '..' - , . ' . <br /> <br />season) southerly wind band with speeds of <br />40 to 60 kt (21 to 31 m sui) at 300 mb (Fig. <br />23) extended from Baja California north- <br />ward across Utah. <br />The 0030 GMT infrared satellite <br />photograph (Fig. 24) showed the large areal <br />extent of clouds and convection over the <br />western United States. An influx of mois- <br />ture from the Inter-Tropical Convergence <br />Zone was indicated by the band of clouds <br />streaming northward out of the tropics and <br />into the western United States. <br />Vorticity and stability analyses along <br />with sounding data are presented in Figs. <br />25 through 27. The 500 mb short-wave <br />trough was clearly depicted on the 0000 <br /> <br />GMT vorticity analysis (Fig. 25) with posi- <br />tive vorticity advection indicated over a <br />broad area from northwest Texas to Idaho <br />and northern Nevada. Comparison with <br />Fig. 8b shows that the position of the short <br />wave was accurately forecast although it <br />was more intense than predicted. The Big <br />Thompson storm was developing in a region <br />of minimum vorticity and weak positive <br />vorticity advection. The active squall line <br />in Nevada and Utah was just ahead of the <br />northward moving short wave. <br />The 0000 GMT stability analyses (Fig. <br />26) showed that the centers of instability, <br />which were over Arizona and western Kan- <br />sas in the morning, had merged to form one <br /> <br />27 <br />