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Last modified
7/28/2009 2:32:29 PM
Creation date
1/8/2008 11:54:38 AM
Metadata
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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 7. _ Summary of snow water equivalents for 5 Cleveland gages for the first 2 months of the <br />winter, and for 5 Denver gages for the first 3 months of the winter. Units are inches or inch he1 snow <br />water equivalent. <br />Cleveland gage number 1 2 3 4 5 <br />Total Snow Water Equivalent 2.86 4.88 4.78 4.72 4.35 <br />Hours with Detectable 146 241 190 205 225 <br />(0.005 inch) Snowfall <br />Half Total S Produced at 0.030 0.035 0.050- 0.040+ 0.030+ 1 <br />Hourly Accumulations ~ <br />Median Hourly Accumulation 0.010 0.010 0.010 0.010 0.010 ~ <br />~ <br />Average Hourly Accumulation 0.020 0.020 0.025 0.023 0.019 <br />Maximum Hourly Accumulation 0.100 0.140 0.195 0.120 0.155 1 <br />Denver Gage Number 1 2 3 4 5 <br />Total Snow Water Equivalent 1.23 1.25 1.84 0.52 3.01 <br />Hours with Detectable 71 55 92 35 136 <br />(0.005 inch) Snowfall <br />Half Total S Produced at 0.030 0.035 0.030- 0.025 0.035 <br />Hourly Accumulations ~ <br />Median Hourly Accumulation 0.010- 0.010 0.010 0.010- 0.010 <br />Average Hourly Accumulation 0.017 0.023 0.020 0.015 0.022 <br />Maximum Hourly Accumulation 0.095 0.115 0.080 0.065 0.175 <br /> <br />experienced a very dry winter. Numerous storms occuIT.ed near Denver (table 5), but they <br />typically produced light' snowfall accumulations over limited periods. Even the mountain <br />gage west of Denver received fewer hours of detectable snowfall than any of the Cleveland <br />gages. The gages near Denver had only 55 to 92 hours with measurable snowfall as <br />compared to 146 to 241 hours for the Cleveland gages. The frequency of snowfall is the main <br />difference between the Cleveland and Denver area data of table 7; average and' median <br />snowfall accumulations are similar. Because of the lack of any major storms near Denver, <br />maximum snowfall accumulations tended to be higher in the Cleveland area, with the <br />expected exception of the Denver mountain gage (No.5). <br /> <br /> <br />Calculation of the median hourly rates provided almost identical values at all 10 gages-near <br />0.01 inch. No doubt the medians would be even lower if gage resolution was less than 0.005 <br />inch. Average accumulations were also similar at most gages, near 0.02 inch hot. Moreover, <br />half of the total snow water equivalent at each gage occurred at similar low hourly <br />accumulations-from 0.025 inch h.t or less at the dry mountain valley site to 0.050 inch h-t <br />or less at Cleveland's gage No.3. The other 8 gages all produced half of their total snowfall <br />at accumulations less than or equal to 0.030 to 0.040 inch hot. <br /> <br />16 <br />
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