WMOD00426

• Title: Desert Research Institute Fields Operations - 1994 NOAA/UTAH Field Program - Final Report
• Date: 11/1/1994
• Weather Modification - Doc Type: Report

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Heimbact'1 and Wellman (1994) provide additional detail concerning the weather on these
dates.
26 January 1994:
7-EI February 1994:
10..11 February 1994:
18..22 February 1994:
27 February 1994:

1 seeding experiment (High alt. Agl)
2 seE!ding experiments (Valley Agl and Propane)
2 seE!ding experiments (Abbreviated expts.)
6 seeding experiments ( 5 High Alt. Agl, 1 Valley Agl)
2 seeding experiments (High Alt. Agl and Propane)

In addition, several other dates with marginal weather were used for experiments such
as radar Ghaff tracking, radiometer-rawinsonde comparisons, and instrument testing, and
will be noted in subsequent sections.

C. Ralwinsonde Operations
Rawinsondes were collected on 17 separate days during the two-month field
program. The equipment used was an RO-65 auto-tracking unit with VIZ sondes.
Sondes were launched from the Mt. PIE3asant Airport (RAW in Fig. 1). For support of the
ground seeding experiments, sondes were typically launched near the beginning of a
research aircraft flight and again near the end of the flight. On some occasions additional
launches were made during a flight. Data were recorded on a strip chart and manually
reduced for selection of significant levels and conversion of chart ordinates to
temperatures and relative humidities, usually within one day of the actual launch. The
reduced data were entered into computer files and a preliminary analysis program was
run using these raw data for the purpose of making preliminary checks of the data during
the field program.
On two occasions the mobile radiometer was driven to the Mt. Pleasant Airport for
the purpose of collecting integrated vapor data during the data collection period of an
entire rawinsonde flight. This allowed for a check of the radiometer calibration and
atmosphl3ric retrieval coefficients. An example comparison of rawinsonde precipitable
water and radiometer integrated vapor is given in Section 20.

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