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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 />'~~~ ~Q:3L <br /> <br />-, ,-', <br /> <br /> <br />Figure lS; Syno~ti.c scale surface analysis for qooOGMT, 1 August 1976, ReIer to legena.o;>f Fig.~4 <br />Joide~ails~" ;ft,'\i ~ ~, $,,: ~ '~::% - &'.9' '-"!ill 0m <br /> <br /> <br />troposphere. In response to this increasing <br />pressure gradient low-level easterly flow <br />had maximized in a broad band from cen- <br />tral Kansas westward to northeastern Col- <br />orado and eastern \Vyoming. Surface re- <br />ports included steady winds of 25 kt (13 m <br />S-I) 'It Akron, gusts to 21 kt (II m S-I) at Ft. <br />Collins, and gusts to 24 kt (12 m S-I) at <br />Denver. This strong, moist flow was <br />oriented nearly normal to the Front Range. <br />Surface observations and the radar <br />and satellite data shown in Figs. 19b and c <br />indicated widespread mountain thun- <br />derstorm activity. A large squall line <br /> <br />stretched from northern Nevada through <br />southern Idaho to southeastern Utah. Salt <br />Lake City reported gusts to 52 kt (27 m S-I) <br />and % in (9.5 mm) hailstones as this squall <br />line passed. A line of strong and visually <br />impressive thunderstorms stretched from <br />Colorado to southern Missouri along and <br />behind the polar front. Even though tops <br />on several of these storms grew to over <br />50,000 ft MSL (15.3 km), their intensities <br />remained below severe limits although lo- <br />cally heavy rains were likely produced. <br />A large area of thunderstorms had de- <br />veloped over east central Wyoming to the <br /> <br /> <br />23 <br />
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