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\. ,i" - WEEKLY FLOOD OUTLOOK - MAY 28, 1996 The Weekly Flood Outlook presents the findings of the Colorado Flood Task Force regarding the 1996 snowmelt flood threat. This Flood Outlook represents a summary of the first meeting of the Colorado Flood Task Force for 1996. 1) MAJOR BASIN SNOWPACK AS OF MAY 28,1996 Based on SNOTEL readings on May 28, 1996 the snowpack in Colorado's major river basins, as a percent of average snowpack, is presented in Table I. Table 1 MISSISSIPPIIMISSOURI RIVER BASIN North PlattelLaramie Rivers 136% 129% 133% 111% 21.1 South Platte River 162% 155% 155% 156% 13.0 Arkansas River 112% 93% 106% 106% 5.3 COLORADO RIVER BASIN Yampa/White Rivers 138% 120% 137% 116% 17.5 Upper Colorado River 134% 128% 138% 99% 8.2 Gunnison River 114% 101% 113% 57% 3.2 Southwestern Colorado 70% 68% 61% 1% 0.1 RIO GRANDE BASIN Rio Grande 66% 59% 49% 1% 0.0 2) WEATHER FORECAST A. 7-10 day forecast The National Weather Service (NWS) provided a short-term weather forecast for the next 7 to 10 days. The NWS is predicting maximum daily temperatures in the high 70' s and low 80' s during the next week or so for Denver and Grand Junction. Precipitation for the week should be minimal, but there is a chance of showers during the week. B. 30 day forecast Henz Meteorological Services provided a weather forecast for the next month or so. There appears to be an unsettled weather pattern that will move through the state causing thunderstorm activity. There is a chance of thunderstorm activity along the Front Range during the first 10 to 14 days of June, which could produce intense rainfall. There will be periods of warm and dry weather between the thunderstonns. The general forecast is presented in table 2. Table 2 i~~tJaijiiConditiomi Warm and d most of the week Storm earl ,hot mid-week, storm at the end of the week Storms earl ,hot at the end of the week Hot some of the week, ossible thunderstorms or eneral rain I ,