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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Table 3. Comparison of mean atmospheric conditions for Phoenix flash flooding <br />days to those in Denver Metro area reported by Henz 1980 and the <br />frontal and Western mean flood cases reported by Maddox et al, 1979. <br /> <br />Atmospheric Variable <br /> <br />Surface temperature - of <br />Surface dew point - of <br />Showalter Index <br />700mb T/T-Td - Oc <br />500mb T/T-Td - Oc <br />300mb T - Oc <br />200mb T - Oc <br />Mean Sub-Cloud Wind Direction <br />Mean sub-Cloud Wind Speed (kts) <br />Mean Cloud Layer Wind Direction <br />Mean Cloud Layer Wind Speed (kts) <br />Mean Sfc-500mb Precipitable Water (In) <br />Stationary Surface front <br />Heavy rain on cool side <br />Wind parallel to front <br />Short wave trough present <br />Weak shear in cloud layer <br />Convective storms <br />Severe Weather Events (% of time) <br /> <br />Colorado <br /> <br />81 <br />49 <br />5 <br />9/5 <br />-9/5 <br />- 35 <br />- 56 <br />0800 <br />" <br />2400 <br />27 <br />0.90 <br />Yes <br />Yes <br />Yes <br /> <br />60% <br /> <br />Yes <br />Yes <br /> <br />807; <br /> <br />Frontal <br /> <br />Western <br /> <br />Arizona <br /> <br />70 86 99 <br />65 56 67 <br />4 5 - 5 <br />7/4 7/3 10/4 <br />-10/4 -10/4 -7/3 <br />- 36 - 34 - 32 <br />- 56 - 55 - 54 <br />1000(SFC) 0.900(SFC) 1200 <br />9 (SFC) 9 (SFC) 8 <br />250 (500mb) 240 (500mb) 180 <br />28 (500mb) 27 (500mb) 22 <br />1 .60 1 .20 1 .30 <br /> <br />Yes <br />Yes <br />Yes <br />82% <br />Yes <br />Yes <br />15% <br /> <br />No <br /> <br />No <br /> <br />No <br />77% <br /> <br />Yes <br /> <br />Yes <br />50% <br /> <br />No <br />No <br />No <br /> <br />70'~ <br /> <br />Yes <br />Yes <br />50% <br /> <br />The atmospheric variables presented in this table are <br />defined in Appendix A. <br />