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<br />From: <br />Subject: <br />To: <br />Date sent: <br /> <br />Matt Kelsch <kelsch@fs1.noaa.gov> <br />extreme rains <br />mlr@riverside.com (marcus rits<::h) <br />Thu, 2 Jul 1998 13: 19: 39 .-0600 (DST) <br /> <br />Hi Markus- <br /> <br />2 ,July <br /> <br />I was just down at the Pueblo National Weather ~Jervice <br />office yesterday to give a talk on the FOrt Collins <br />storm and extreme events in other parts of eastern <br />Colorado. The seemingly greater frequency of Extreme <br />precip bullseyes in northeastern Colorado (rather than <br />southeastern) I believe is a combination of: <br /> <br />(1) there is a slightly greater tendency for these type <br />of events along and north of the Palmer Divide, and <br />(2) demographics would suggest that an extreme precip <br />bullseye and its impact is more likely to be observed <br />along the eastern slope of northeastern Colorado. <br /> <br />Meteorology <br /> <br />Focusing storms is primarily from upslope flow of moist a:_r <br />associated with the passage of a cool front frem the north. <br />These fronts often slow down or stop along east--west ridges <br />such as the Cheyenne Ridge along the Wyoming bcrder, the <br />Palmer Ridge, and the Raton Ridge down along the New Mexico <br />border. More fronts make it to the Palmer Ridge than to <br />the Raton Ridge, thus northeastern Colorado has more days <br />with upslope flow. Furthermore, the geographic upslope along <br />the northeastern Front Range and High Plains appears t:o be <br />greater than the corresponding terrain slope in southeastern <br />Coloroado. <br /> <br />Demograhics <br /> <br />On the Fort CQ.llill$_ daV-l__-Rng__.9:_L_.J~h~_~~.9_Llf:.._e.~tx_eICE~__ p.uI1s.eye.:;i__nW_2tS <br />.iJl_.~2~th_~_~2.t...~rrL_CQ.~_~90, but it was largely unobserved (far <br />more sparsely populated than the area near the \Veld County <br />precip bullseye). I think the northeastern plains have a <br />slightly greater number of potential observers. Along thE~ <br />Front Range from Trinidad to Colorado Springs, there is clearly <br />more unpopulated stretches than the corresponding chunk of <br />Front Range from Castle Rock to Fort Collins. It would bE? <br />more difficult for a flood in the northern Front Range not <br />to have an impact on society. <br /> <br />Hope that helps! <br />a FElfJA meeting. <br /> <br />I'll be up there at City Hall on the 8th for <br /> <br />Happy Fourth. <br /> <br />-Matt <br /> <br />Markus Ritsch <br /> <br />-- 1 -- <br /> <br />Thu, 2 Jul 1998 17:11:47 <br />