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Last modified
7/28/2009 2:32:29 PM
Creation date
1/8/2008 11:54:38 AM
Metadata
Fields
Template:
Weather Modification
Sponsor Name
USBR Technical Serivce Center, River Systems & Meteorology Group
Project Name
Snow Accumulation Algorithm for the WSR-88D Radar, Version 1
Title
Snow Accumulation Algorithm for the WSR-88D Radar, Version 1
Prepared For
USBR
Prepared By
Arlin B. Super and Edmond W. Holroyd
Date
6/1/1996
State
CO
Weather Modification - Doc Type
Scientific Study
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<br />Table 2. - Summary of snow storm periods sampled by the volunteer network near Albany, New York, <br />during the 1995-96 winter. Activation refers to whether part or all of network was requested to make <br />8 and 8D observations (see text). <br /> <br />Event Start date-hour (UTC)* Stop date-hour (UTC) Activation <br />No. <br /> <br />01 Dec-03 <br />09 Dec-06 <br />14 Dec-09 <br />19 Dec-18 <br />02 Jan-12 <br />07 Jan-12 <br />12 Jan-15 <br />16 Feb-13 <br />02 Mar-09 <br />05 Mar-06 <br />06 Mar-21 <br />29 Mar-03 <br />09 Apr-20 <br /> <br />01 Dec-21 <br />10 Dec-09 <br />15 Dec-06 <br />21 Dec-06 <br />04 Jan-12 <br />09 J an-OO <br />13 Jan-15 <br />17 Feb-13 <br />02 Mar-21 <br />06 Mar-06 ' <br />09 Mar-OO <br />29 Mar-18 <br />11 Apr-OO <br /> <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />~cJJ-.~ <br />/'(LS . ~ \) h, ~ reJ> <br />d.~ 10 <br />11 <br />JJa.~@ <br />~ ,\bM 13 <br />~\;>' . ~Vl\".' <br />1 ~.~ * UTC = universal time coordinated <br />?' <br /> <br />Partial <br />Full <br />Partial <br />Full <br />Full <br />Partial <br />Full <br />Full <br />Partial <br />Full <br />Full <br />Partial <br />Partial <br /> <br />Not all volunteers were available during each storm, and the times during which each <br />volunteer was able to take measurements varied from storm to storm to account for sleep <br />time. During storms with full network activation, about 40 to 50 volunteers made hourly <br />observations. Of course, specific measurement locations varied from storm to storm <br />depending upon the availability of particular observers. <br /> <br />Volunteer observations were collected at the Albany WFO, entered into a computer data base <br />by university students and, at this writing, are being double-checked for accuracy. by <br />comparison with nearby observations. In addition, two Belfort Universal gages were operated <br />during the latter part of the winter at the locations shown in table 1. As with all Belfort <br />gages used in this study, the two near Albany were equipped with Alter wind shields. The <br />Albany gages were located in protected clearings in the forest. <br /> <br />The standard mode of clutter suppression with the Albany WSR-88D during storms of the <br />past winter was to always use the Clutter Bypass Map and moderate suppression (personal <br />communication with John Quinlan). No operator-designated boxes with zero suppression <br />were attempted near Albany because of complex terrain and corresponding widespread <br />ground clutter. <br /> <br />To date, no analysis of the Albany radar and snowboard data has been undertaken. <br /> <br />3.3. Denver, Colorado, Observations <br /> <br />Snow measurement sites within range of the Denver radar were selected by Reclamation <br />meteorologists after consideration of several factors to be discussed, including examination <br />of maps and considerable on-the-ground searching. The Denver area provides both prairie <br />locations, chiefly affected by upslope storms, and mountain locations affected by various <br />storm types. <br /> <br />6 <br />
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