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Last modified
8/16/2009 2:57:40 PM
Creation date
10/4/2006 6:49:23 AM
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Board Meetings
Board Meeting Date
1/27/2004
Description
WSP Section - Native Species Trust Fund, Recommendations for FY 2004-05
Board Meetings - Doc Type
Memo
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<br />.\\'aler in the Balance. <br /> <br />nonhern half ofCo]orado. The only examples of four <br />or more conM:cutive years wiLh less than 80'* of Lhc <br />long tenn average falling each year were found over <br />souLhwestem Colorado near the lurn of the last <br />century (1899-1902). in southeastern Colorado during <br />thedusloowl years (1933-1937). and ovcr isolated <br />areas of eastern Colomdo 1952- 1956. <br /> <br />Based on SPI analYM:s. four droughts wilh a duralion <br />ofallcast four years (48 monLhs) have occurred <br />during Ihc past CCnlury (M:C graph below). <br /> <br />The significance and impacts of drought tend to <br />Increase with increasing duration (1930s, ]950...). <br /> <br />Briefbut extreme droughls can also ha\"e severe <br />impacts, Forexample, extremely dry weather in eastern <br />Colorado in April, May and Junecan ruin most of the <br />winler wheal crop, even if the rest of the year is qUlfe <br />wet. Likewise, a very dry December, January and <br />February can have very adverse financi31 imp;:lCl.S on <br />Colorado's wintcr recreation industry. cyen iflatc <br />season snows make up most of the precipitation <br />deficit. <br /> <br />Drought episodes have lash::d as long as 10 years <br />(1930...). However, these long-duration droughts are <br />interspersed with periods of wet weather. For cxample, <br />some ofColorado's WCHest month.\on record (April <br />19<X). May 1935. S~'ptemhcr 1938) were emlx.-dded in <br />long-duration drought episodes. <br /> <br />5) Spatial paltem.'lo of drought. <br /> <br />There appears 10 be no such Ihing as a "Iypical" <br />drought pallern. <br /> <br />Each of the largest and most se"'ere droughts have <br />had their own unique fonnation and spatial paucms. <br /> <br />Each region of the stale has il5 own droughl history <br />which may be similar or tOla]]y different from other <br />regions of the sl.1te. Nonhem Colorado is sometimes <br />wet when southern Colorado is dry and vice versa. <br />The same is true for east \'ersus west. <br /> <br />It is rare for Ihe entire "late !Oexhibit similar precipita- <br />tion patterns for more Ihan a few months in a row. <br /> <br />6) Drought severity - how dry can il get'! <br /> <br />Many areas of Colorado have gone without any <br />measurable precipitalion for up to 6Oconseculi\e <br />days. For a six-month winter season. 25--J(>'7b of the <br />a\'Crage accumulated precipitation repre!.ents an <br />extremely dry winter (OclotlCr-March). For an enlire <br />year. 50-60% of a\'erage represents an extreme drought <br />year. Two 10 four months in a row wiLh less precipita- <br />tion than a"'erage is common. Fi"e or more consecu- <br />tive monLhs with below avcrage precipitalion is very <br />rare. Some weather slations have nevcr had 6 or more <br />consecutive dry months. <br /> <br />;\lultiyear droughts of up to three consecutive YCilI'S <br />wilh less than 60% of average precipitation have <br />occurred once or Iwice in the past 110 years at some <br />locations in southeast and southwest Colorado. In <br />Colorado's nonhern mountains, few sites have <br />experienced IWO years In a row with less than 80'* of <br />average precipil.1tion. <br /> <br />Another way of looking al drought is by detennining <br />"accumulated deficits", Fore,ample. if your average <br />annual precipHation is 16 inches. but you only <br />received 12 inches. your accumulated deficil would be <br />4 inches for Lhat year (see chart on Ihe next page). <br />\\'hen you accumulate deficits and surpluses year <br />after year. you find that Co]orado's worst droughts <br />reach an equi\'alent deficit of aroutlwo full years of <br />average pn."Cipil.1tion. In Color:ldo's nonhem <br /> <br />, <br /> <br />I <br /> <br />f '" c ".. . I {' . I. ,. .. I. P ... I _, B . or' .. ~.... . .,. \,., <br /> <br /> <br /> . , <br /> . . <br /> .. <br /> . , <br />I . . <br />! <br /> . . <br /> , . <br /> . . <br /> <br />.' <br /> <br /> <br />i <br /> <br /> <br />. <br /> <br />! ! ! ! ; ; ; ! i ; i ! ! ! ! ! i ! ; i ; - ! ! , , i I ! <br /> .... <br /> 16 <br /> <br />
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