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<br />t <br />t <br />t <br />. <br />~ <br />~ <br />~ <br />~ <br />~ <br />~ <br />~ <br />~ <br />~ <br />~ <br />~, <br />~ <br /> <br />Heavy Precipitation Outlook (HPO) <br />This text product is available by 1100 AM every day from April 15 through September <br />15. It provides a weather forecast for the District with emphasis on possible rainfall <br />amounts and where storms are most likely to occur. When flood potentials threaten <br />the District, this product will be revised and renamed "Internal Message Status" or <br />IMS. This report will indicate the message status for each county within the District. <br />Those counties include Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas <br />and Jefferson. An example of the HPO product can be found on page 61 in the <br />Technical Addendum. <br /> <br /> <br />" <br /> <br /> <br /> <br /> <br /> <br />./:;....<>.... <br />)~_. <br />: ~_ .-',' ,1:- ..... ~ " <br /> <br />. ,,- <br /> <br />" <br /> <br /> <br /> <br />,"",. ....~~ <br /> <br />", <br />" <br /> <br />,.40#.. <br /> <br />..,..... <br /> <br />/\ <br />Figure 2: The Urban Drainage and Flood Control District area, depicted in the color purple. <br /> <br />.: ~.. " <br /> <br />" <br />. ....... <br />.......,. <br /> <br />Quantitative Precipitation Forecast (QPF) <br />This text product is only produced on days when the rainfall potential is predicted to <br />exceed 1.5 inches in one-hour or less. The QPF product contains more basin- <br />specific information than the HPO or IMS and requires some knowledge of the <br />regional major drainage basins, streams and associated flood hazards that impact <br />the District. Storm types, expected rainfall totals, storm duration, peak intensities <br />and associated probabilities of occurrence are presented in this forecast product. An <br />example of the QPF product can be found on page 62 in the Technical Addendum. <br /> <br />. <br />. <br />. <br />. <br />. <br /> <br />StormTrak (ST) <br />This combination Geographic Information System (GIS) based map/text product is a <br />short lead-time prediction showing where a storm has formed or is forming, the <br />approximate size of the storm, the direction (or track) of the storm, and the estimated <br /> <br />17 <br />