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Last modified
7/28/2009 2:35:41 PM
Creation date
3/11/2008 2:43:45 PM
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Template:
Weather Modification
Title
Investigations of Winter Storms Over the Wasatch Plateau During the 1991 Utah/NOAA Field Program
Prepared For
Utah Department of Natural Resources Division of Water Resources
Prepared By
Arlen W. Huggins, Melanie A. Wetzel, Patricia A. Walsh
Date
10/1/1992
State
UT
Weather Modification - Doc Type
Report
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />computation of liquid water fluxes the original 2-min data values were averaged over l-h <br />periods. The set of daily fIles of l-h averages became the fmal archived USBR radiometer data <br />set. <br /> <br />The DR! radiometer data set consisted of three separate subsets of data; zenith data <br />collected in mobile mode, zenith data collected in stationary mode at the DOT site, and <br />azimuthal scan data collected at the DOT site. Mobile data were collected over three distinct <br />routes over the Wasatch Plateau (see Fig. 2.1). A log of mobile operations appears in Appendix <br />C and Huggins (1991). The position data for each mobile experiment were recorded in the <br />radiometer field log and consisted of time entries at known locations (road mile markers, <br />instrument sites, highway intersections, etc.). During the field program each of these landmarks <br />was surveyed using a Global Positioning System (GPS) or topography maps to determine its <br />precise latitude, longitude, and height. Latitude and longitude were then converted to x and y <br />coordinates relative an origin at the DOT site. The landmark position coordinates were then <br />matched with the times that each landmark was encountered in each of the mobile radiometer <br />data files. A simple linear interpolation was then applied to determine the radiometer x, y and <br />z positions between landmarks. An archive fIle containing liquid, vapor and position data was <br />then created for each separate mobile experiment. The data averaging period for experiments <br />was either 4-s or I-min. At the typical mobile radiometer speed of 20 mph, 4-s amounts to a <br />horizontal distance of about 36 m and 1-min represents a distance of 537 m. <br />Zenith data collected at the DOT site by the DR! radiometer were selectively processed <br />for purposes of comparison with the USBR radiometer data, or to fill in gaps in the USBR data <br />set. Comparison data appear in Section 4. Scan data were generally collected only when the <br />DOT site was manned for nighttime operations. All scans for the 1991 season were processed <br />and archived in sequential order into a separate file. Several lengthy periods of scans taken at <br />one to two hour intervals are analyzed in Section 4. <br /> <br />B. Mt. Pleasant Sounding Data <br />The editing and archiving of soundings taken from the Mt. Pleasant Airport are described <br />in Huggins (1991). Analysis programs were adapted to enable plotting of the data in Skew-T <br />log-P format. Where the separation between soundings was six hours or less, interpolated data <br />fields were created. Several interpolation schemes were tested and used to produce data fields <br />in 100m height intervals and I-h time intervals. This 1-h separation was selected to match the <br />1-h averages of USBR radiometer liquid data. In Section 4 calculations of liquid water flux <br />from USBR radiometer averages and sounding westerly wind components are presented. In <br /> <br />2-6 <br />
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