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Last modified
7/28/2009 2:32:39 PM
Creation date
1/8/2008 12:16:50 PM
Metadata
Fields
Template:
Weather Modification
Applicant
Thompson, J.R., G.W. Wilderson, and D.A. Griffith, North American Weather Consultants
Sponsor Name
USBR
Title
Cloud Seeding Data Collection, and Analysis Assoc. with the Colo River Augmentation Demonstration Program
Prepared For
USBR, Divison of Atmospheric Research
Prepared By
Thompson, Wilderson, Griffith
Date
12/1/1987
State
AZ
Weather Modification - Doc Type
Scientific Study
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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 />and wait until they either moved into the region or by-passed <br />the area. <br /> <br />Fortunately, from the SLW analysis, it seems there is <br />enough consistency in the usual appearance of the SLW to alert <br />personnel and commence storm monitoring before the SLW appears. <br />In most cases the appearance of SLW would be expected when <br />the system is still some 200 nautical miles upwind. with <br />the usual eastward translation speeds of between 15-30 knots <br />this would equate to 6-~2 hours or more before passage of <br />a front or trough. However, in this context forecasting has <br />been relegated to essentially now-casting with the greatest <br />need being the timely accessibility to weather observations <br />such as aviation hourly weather, satellite imagery and National <br />weather Service or project operated rawinsonde data. <br /> <br />3.2 Arizona Precipitation During the Field Season <br /> <br />Precipitation totals (in inches of liquid) for the mid-January <br />to mid-March, 1987, field season at each of the recording <br />gauge sites are listed in Table 3-2. Some of the gauges had <br />missing data, in which case the totals have been estimated <br />by doing an isohyetal analysis using storm totals from each <br />gauge with data and assigning a precipitation value for the <br />gauge with missing data. At Happy Jack, the gauge overflowed <br />during a portion of the February 23-26 storm and part of the <br />record was lost. However, bag snow samples were being taken <br />and weighed during the time the gauge overflowed (about 5 <br />hours) and the hourly totals during this period were calculated <br />from the bag samples by dividing the weight of the bag sample <br />(in grams) by the area of the bag sample collector (in sq. em.). <br />The January data begins on January 11 and includes the rest <br /> <br />3-20 <br />
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