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Last modified
1/25/2010 6:44:42 PM
Creation date
10/5/2006 12:11:28 AM
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Floodplain Documents
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State of Colorado
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Statewide
Title
Extreme Precipitation Study: Storm Data and Interpretation from HMS Storm Files
Date
4/1/1997
Prepared For
State Climatologist
Prepared By
Henz Meteorological Services
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Climatological Data for Colorado which includes a "Weather Summary and Severe <br />Storms" summary does not mention this event, its reliability has been debated for lTJany <br />years. <br /> <br />Henz (1995) analyzed the potential convective storm genesis areas and storm tracks for <br />the Cimarron event. He found that meteorological conditions were present on this day for <br />a potential 2-hour convective rain event in western ColorE-do. In order for the observed <br />rainfall to have occurred, Henz found that a surface temperature of 60 degrees F and a <br />representative local valley dewpoint of 52 degrees F was needed. An examination of <br />surface observations showed that representative temperatures and dewpoints reached only <br />53 degrees F and 49 degrees F respectively. This suggesti;d that rainfall amounts would <br />have been only about 0.55 inches in 30 minutes. The Henz analysis ofstornl genesis <br />areas showed that storms on this day could have formed in one of two areas located south <br />and southwest ofCirnarron depending on the time of day. Storms could not have formed <br />further upstream because conditions in this ~area were too dry for convective activity. <br />Since the rainfall report was entered at 3 p.m. (LDT), the ~;tornl genesis area affecting <br />Cimarron was the one located to the south of the town. <br /> <br />Both stornl tracks produced small areas of rainfall. Since a rainfall of the reported <br />intensity would have produced a peak discharge of 5,000 to 9,000 cubic feet per second <br />compared to the 70 cubic feet per second reported, there is no paleo hydrological sUPP0l1 <br />for the occurrence of this event. <br /> <br />Based on the above considerations, HMS concludes that the report of 5.25 inches near <br />Cimarron is erroneous and recommends that this event be deleted from the list of <br />heavy rain-producing local storms. <br /> <br />3.3 Plum Creek and Kiowa Creek, Colorado; June 16-17, 1965 <br /> <br />The month of June 1965 produced many heavy thunderstolms throughout Colorado. <br />According to the publication Storm Data flood damage estimates by the U.S. Corps of <br />Engineers exceeded $500 million, an astronomical sum for 1965. Heavy rain and <br />flooding was pm1icularly severe in the Plum Creek and Kiowa Creek watersheds and <br />downstream into the South Platte system eventually affectll1g Littleton and Denver. A <br />general summary of this event taken from accounts 111 Storm Data is as follows: <br /> <br />"Heavy rain of cloudburst proportion, in an area from south of Palmer Lake along <br />the west and east Plum Creeks to South Denver, did much damage on the <br />afternoon and evening of June 16th. Some unoffiCial rainfall amounts were: <br />Palmer Lake 14.0", Larkspur 14.0", and Castle Rock area 12.0". The normally <br />dry streams were at flood stage in a short time. The flood passed through <br />Larkspur, leaving extensive damage, then the Castle Rock area, heavily damaging <br />roads and bridges. The two Plum Creek branches combine at Sedalia, which was <br />damaged. By evening the flood reached the South Platte near Littleton, and was <br /> <br />9 <br />
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