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<br />e,
<br />
<br />San Juan region but more severe in the other parts of the State, prob-
<br />ably as a result of a mass of moisture-laden air deflected upward by
<br />the Front Range, where the heaviest precipitation outside the San
<br />Juan region occurred. Depth of precipitation at the four stations
<br />outside the San Juan region at which it was greatest was as follows:
<br />
<br />17
<br />
<br />METEOROLOGIC CONDITIONS
<br />
<br />e
<br />
<br />Inella
<br />3. 97
<br />3.41
<br />2. 66
<br />5. 25
<br />
<br />Boulder________________________________"______________
<br />lIa'vthorne____________________________________________
<br />Colorado Springs_______________________________________
<br />Santa Clara____________________________________________
<br />
<br />but was much less in
<br />The following table
<br />
<br />Rainfall was general throughout the State,
<br />amount at other stations than at those just listed
<br />gives the amounts at stations in the San Juan region.
<br />
<br />Sept. 3-6, 1909
<br />
<br />San J Win region
<br />
<br />inches, in the
<br />
<br />in
<br />
<br />Rainfal
<br />
<br />Total
<br />
<br />The severest flood of record in the southwestern part of the State
<br />was caused by the storm of October 4-6, 1911, which followed a
<br />summer during which thc precipitation was above normal. The daily
<br />weather maps show that on October 4 a low of 29.7 inches developed
<br />over western Nevada, and moved with incrensing intensity over
<br />central Arizona, reaching 29.45 inches on October 5. At that time, a
<br />high of 30.3 inches had developed over the Great Lakes. As the season
<br />was early fall, the moist winds from the Pacific had high temperatures.
<br />These winds were deflected upward by the mountain masses in the
<br />southwesterT) part of the State, causing intense precipitation. Bv
<br />.. - - - -
<br />October 6, the low had moved northwestward over Iowa, passing over
<br />the southeastern part of Colorado, and precipitati9n had practically
<br />ceased in Colorado.
<br />" The following table indicates the influence or the mountains on
<br />precipitation in the San Juan region.
<br />
<br />
<br />~~
<br />I.~
<br />I,M
<br />~~
<br />~oo
<br />~fi
<br />~oo
<br />1.81
<br />1. 40
<br />.W
<br />.11
<br />.41
<br />.n
<br />
<br />0,04
<br />.04
<br />.37
<br />.15
<br />.3'
<br />.08
<br />.17
<br />.18
<br />.30
<br />.04
<br />.19
<br />.10
<br />.18
<br />
<br />1911
<br />
<br />0,29
<br />.15
<br />.04
<br />.30
<br />.23
<br />.10
<br />.13
<br />.35
<br />. J8
<br />'fr.
<br />. i3
<br />27
<br />
<br />OCTOBER 4-6,
<br />
<br />Altitude
<br />(reet)
<br />
<br />7.030
<br />7,610
<br />6,589
<br />7,200
<br />8,~00
<br />8.300
<br />9,400
<br />10,400
<br />7,108
<br />6,425
<br />10,000
<br />6,942
<br />7,500
<br />
<br />Mancos___
<br />Fort Lewi,
<br />Duran~o__
<br />Tacoma_n
<br />Cascade _ _
<br />Terminal Dam__
<br />Sih'crton_ ____on
<br />Gladstone _ _ _ ~ _ _ nn _ _ _ _ _ _ n __ n_ _ _ _ __
<br />Pago,", Spring, ___hh___n________
<br />~.~~~\!~-_.-u _____.__u________._
<br />D~i~;e;~~==== ======::===:::::::::
<br />Chromo__n_ _nn __h _nnnn___
<br />
<br />Station
<br />
<br />over northern
<br />The following
<br />listed from
<br />
<br />basins,
<br />1894.
<br />
<br />Over Nevada, t an area of high pre"ure (30 .1 inches)
<br />~Iinnesota and the western edge of the Great Lakes.
<br />table shows the precipitrutnon at stations in these
<br />north to south, for the perriod l\1L,Y 29 to June 1
<br />
<br />IN COLORADO
<br />
<br />FLOODS
<br />
<br />.it)
<br />
<br />June 1, 1894-
<br />
<br />May 29
<br />
<br />_,~llIfaY30 I MaY~'_I_
<br />
<br />,,_I Sept. 3 1 Sept. 4 I Sept. 5 I Sept.6 __
<br />
<br />
<br />! 1. 74
<br />, 2.85
<br />2.87
<br />3.61
<br />4.32
<br />3.[0
<br />2,95
<br />2.76
<br />2.35
<br />.91
<br />
<br />I .60
<br />.99
<br />1. 61
<br />
<br />Total
<br />
<br />o.n
<br />.11
<br />.47
<br />3,30
<br />5,00
<br />8.54
<br />5,83
<br />5,75
<br />.1,05
<br />I.W
<br />2,84
<br />2,19
<br />2,02
<br />2,49
<br />G.66
<br />2,41
<br />4,86
<br />7.50
<br />4,97
<br />5,OG
<br />3.18
<br />1.20
<br />
<br />Juno
<br />
<br />to
<br />
<br />74
<br />12
<br />
<br />3.30
<br />5,00
<br />2_ 30
<br />1. 06
<br />2.50
<br />2,65
<br />88
<br />
<br />04
<br />
<br />2,15
<br />68
<br />
<br />.01
<br />.32
<br />.15
<br />W
<br />16
<br />
<br />82
<br />1. 33
<br />,84
<br />1. 58
<br />2,00
<br />1. 44
<br />
<br />Range,
<br />
<br />0.50
<br />.07
<br />'.W
<br />
<br />
<br />~W
<br />~M
<br />~~
<br />~m
<br />.~
<br />~~
<br />
<br />1,~
<br />
<br />I.M
<br />~~
<br />1.17
<br />ag
<br />~W
<br />2M
<br />4,31
<br />I.~
<br />.W
<br />
<br />and Front
<br />
<br />Altitudo
<br />(feet)
<br />
<br />5,053
<br />4.985
<br />5.01l0
<br />7, i75
<br />9,300
<br />9,31l0
<br />9300
<br />8: (l3D
<br />7,955
<br />,5,283
<br />6.201
<br />10. 228
<br />9,785
<br />6,900
<br />14, III
<br />6.540
<br />6,500
<br />IO,2(lS
<br />6,098
<br />5,343
<br />4.685
<br />8,700
<br />
<br />South Platte River TIasin:
<br />Laportc_n____ _ n __ ___
<br />Fort Collins__________
<br />Lonland_ _ __n__ _____
<br />?\foraineuu______ _ __.
<br />SuoarJoaL _ __ _ _____ 0._
<br />Ward dislriet._____n_
<br />SunnYside. __u. _ _ ____
<br />Gold 'H,iIL___,___ __ _____ __u _ _ _ ____ _::,'
<br />
<br />DUIIlont. _. __._...._ _ __...___.___ __ .______
<br />Den vcr __ - - n_______ _ __ _____. __ __ _____
<br />Castle Hock _, _ __ _ _ _ __ _"___ 0. __0. _0.__
<br />Alma (~ollth Park)___________________
<br />.\rk~7s~~o l~~O~~lt~~~?)--n---- u ----_ _ ---I
<br />Dh-ide Experiment Station ._.U
<br />Pikes Peak__nn___ '__n
<br />Husled_ _n_________ __u_
<br />
<br />r~k~ ~W;iJlc::::::::::
<br />Colorado SprilJgs. _ _ _h_
<br />Canon City_____h ____
<br />l'ucblo_____h____,_ hn
<br />Xorlh Lakc_______ ____
<br />
<br />the JiWlhills
<br />
<br />along
<br />
<br />in inches,
<br />
<br />Station
<br />
<br />Rainfal
<br />
<br />0.27
<br />04
<br />17
<br />
<br />--
<br />
<br />50
<br />
<br />'l'r.
<br />02
<br />75
<br />08
<br />
<br />.08
<br />.75
<br />50
<br />
<br />.64
<br />.40
<br />
<br />The onlyst.ation at which precipitation was recorded farther west
<br />in the Arkansas River Basin was Twin LHkes (ll!titudc 9,200'fcet),
<br />which had a total precipitation of 1.44 inches for the period.
<br />In the storm of 1894 them. were two areas of heavy precipitation-
<br />the Pikes Peak region and the eastern slope of the Front Range west
<br />of Boulder. The Front Range here' forms the Continental Divide,
<br />and the area of heaviest rC(Ordedprecipitation was a.bout 10 miles
<br />east of the Divide, where the mountains rise more steeply both on
<br />their' eastern and western slopes than elsewhere, and the topography
<br />is somewhat analogous to the abrupt slopes of the Pikes Peak region.
<br />West of the' Front Range the rainfall was very much less, being
<br />less than 1 inch at every station except Climax, near the Oontinental
<br />Divide, which rises abi'upt'ly from the western end of South Park,
<br />a comparatively level expll1lllSe that extends eastward to the Front
<br />
<br />high water in
<br />less than normal
<br />
<br />in causing'
<br />
<br />Range.
<br />~Ielting snow was a less mportant factor
<br />thisf!ood than iu1921, as oosnow covenvas slightly
<br />
<br />,"
<br />
<br />3~6, 1909
<br />
<br />The storm of September :r--6, 1909, like tha:,tof October 4-6," 1911,
<br />affected chiefly tl~e southwttS-tern part of the State mid was similar in
<br />character. ~t was less seVlrnc than .;he.storm of October 1911 ill the
<br />
<br />SEFlIEMBER
<br />
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