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<br />De~-10-96 16:34 HENZ METEOROLOGICAL SRVC. 303-458-5309 <br /> <br />P.03 <br /> <br />I .- <br /> <br />. <br /> <br />page two <br /> <br />Table 1 shows an example of the rainfall data as prepared recently for the USGS <br />after the Virginia Canyon Flash Flood of August 18, 1991. HMS will prepare <br />spreadsheets of the rainfall and radar data coverage for basin areas in Excel 7.0 <br />for Windows 95 format on 1.44MB, 3.5 inch floppy disks for each of the events. <br /> <br />The time periods of rainfall re.constitution for each of the six events will use the <br />following identified archived radar data: <br /> <br />1. June 12: 1212216Z to 13/0112Z...lntense pre-flood thunderstorms <br />2. July 12: 12/1917Z to 13/0047Z... the antecedent moisture storm periods <br />3. July 12: 13/0053Z to 0533Z....the flash flooding storm period <br />4. August 7/8: 7/1938Z to 7/2043Z and 8/2055Z to 8/2224Z: two consecutive <br />days of intense storms over portions of the basins <br />5, August 23: 2001Z to 2309Z...post flood Intense thunderstorms <br />6. September 14: 2105Z to 2305Z...intense post-flood thunderstorms <br /> <br />. <br /> <br />The time periods above are indicated in Z or GMT ( Greenwich Mean Time). <br />The relationship of local time to Z time Is plus six hours, Le., 1500 LOT or <br />3:00PM in the afternoon equates to 2100Z. Please note that HMS will be re- <br />constituting rainfall for all of the above time period for each of the events. <br /> <br />The scope of work will include the following tasks in two phases: <br /> <br />Phase 1: Evaluation of rainfall and weather factors contributing to the July <br />12,1996 flash flood on Buffalo Creek. <br /> <br />. Task 1: Prepare re-constitution of the flash flood on July 12, 1996 which <br />will provide the depth, aerial coverage, intensity and duration of the <br />rainfall that created the deadly flash flood and the weather factors which <br />produced the flash flooding thunderstorm complex. <br /> <br />. Task 2: Prepare re-constitution of the storm events of June 12, August <br />7/8, August 23 and September 14 which will provide the depth, aerial <br />coverage, Intensity and duration of the rainfall and weather factors <br />associated with these storms which crossed the Buffalo Creek basin <br />but did not produce deadly flash floods. <br /> <br />. <br /> <br />· Task 3: Identification of quantitative weather and rainfall criteria related <br />to the issuance of flash flood watches and warnings for the Buffalo <br />Creek basin during its recovery period. <br />