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<br /> <br />18 <br /> <br /> <br />Table 2.1. --Storms critical fox: the development of ULDRS over the <br />Colorado River basin above Hoover Dam <br /> <br /> General storm DAD <br /> Storm dates Storm type1 location available <br />October 4-6, 1911 T AZ, CO, NM Yes <br />April 5-9, 1926 ET AZ, UT No <br />September 11-13, 1927 T AZ, CO, NM, UT Yes <br />October 11-14, 1928 ET UT No <br />September 3-7, 1939 T AZ, CO, UT Yes <br />September 8-13, 1939 T AZ, CO, NM, UT Yes <br />May 30-June 3, 1943 ET CO, UT Yes <br />October 26-29, 1946 ET NV, UT No <br />October 10-15, 1947 ET AZ, CO, NM, UT Yes <br />August 26-30, 1951 T AZ, NV, UT Yes <br />September 4-7, 1970 T AZ, CO, UT Yes <br />May 4-8, 1971 ET NV, UT No <br />September 28-0ctober 2, 1971 T AZ No <br />October 3-7, 1972 T AZ, CO Yes <br />October 17-21, 1972 ET AZ, NM Yes <br />September 7-12, 1980 ET UT Yes <br />July 16-18, 1981 ET CO, UT No <br />September 26-0ctober 1, 1982 T AZ, NM, UT Yes <br />September 28-0ctober 2, 1983 T AZ No <br />July 20-23, 1984 ET NV, UT Yes <br /> <br />1 T (Tropical Cyclone), ET (Extra-Tropical Cyclone) <br /> <br />Depth-Area-Duration (DAD) data. Individual storm analyses used <br />standard DAD procedures and a computer program developed by USBR to <br />expedite the data processing. <br /> <br />2.3 <br /> <br />DESIGN RAINSTORM SCENARIO <br /> <br />From the examination of the twenty selected storms, two hypothetical <br />weather situations were developed that could cause the ULDRS over <br />the study basin. One scenario involves a tropical cyclone <br />developing over the tropical eastern Pacific Ocean to eventually <br />penetrate the southwestern United States. Remnants of the tropical <br />cyclone would then interact with mid-latitude upper-air circulation, <br />