<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 />
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