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Last modified
1/29/2010 10:11:48 AM
Creation date
10/4/2006 10:33:40 PM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Boulder
Community
Weld, Boulder Counties
Stream Name
Big Thompson River
Title
Meteorological Aspects of the Big Thompson Flash Flood of 31 July 1976
Date
7/1/1977
Prepared For
State of Colorado
Prepared By
NOAA
Floodplain - Doc Type
Flood Documentation Report
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<br /> <br /> <br />.. ..... ...... .... ..." .'. . .~. <br />Flgu"re9,"'S!"bllilYphartJor;1200 fiMT,.31;JUIY 1976. TotaIS"\\1de~~ri'cl'SY\1~P~C scale~SUrfac: <br />"! anlIlXS!!s'!re S~,'.1\Y11 in ~,Il!Ck"lIn~.lab!~iegiOn!l with a .rOlals,lnde~,,,, SQ,areshad.ecl gray. Lifted <br />!n~ex.,v~~ues(or~~ge},~""ShPwnf~ Colora~o and P!'rtions~"s~rroundi~g s\:,!~s. " <br /> <br />0Jii <br /> <br /> <br />levels in Idaho and Utah, and heavy rains <br />with flash flooding were reported in por- <br />tions of Idaho, Oregon, Nevada, Utah, <br />Wyoming, and Colorado. Synoptic <br />weather conditions were quite similar to <br />those associated with the Las Vegas flood of <br />3 July 1975 (Randerson, 1976). <br />East of the Continental Divide the <br />atmosphere was conditionally unstable, <br />but high LFC's indicated that considerable <br />lifting and/or heating would be needcd to <br /> <br />12 <br /> <br />trigger deep convection. It was apparent <br />that, should storms develop over the east- <br />ern slopes or high plains, they would be <br />very slow moving because of the light <br />winds aloft. Unusually large amounts of <br />precipitable water, combined with slow <br />storm movement. suggested that thun- <br />derstorms would have the potential to pro- <br />duce heavy precipitation over localized <br />areas, <br /> <br /> <br />..' . <br /> <br />?s:~;..c:, <br /> <br />
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