WMOD00375

• Contract/Permit #: 0-07-81-V0144
• Project Name: South West Drought Project
• Title: Operational Weather Modification - Volume I: A Seminar Series
• Date: 9/1/1981
• State: OK
• Weather Modification - Doc Type: Report

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FIG. I. ~Iap of the Central Plains .,howing the locations of the
nine box total analysis area includi"l!; the Dodge City (DDC)
experirnen t a.rea.

operations are suspended. Thus, that day and its rainfall, if
any, is extracted from the set of seeding opportunity days.
2) DDC area watches - This conservative approach leads to the
termination of operations for any severe weather watch that falls
within the DDC area. Weather conditions within the surrounding
areas do not influence the decision making.

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TABLE 1. Summary of June 1965-74 tornado and severe weather watch
information taken from NSSFC weather logs.

Year
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 Average
Tornadoes (total area) 20 22 37 17 18 18 34 5 5 7 18.3
Tornado days (total area) 13 11 21 11 14 11 15 4 4 7 11.1
Tornado days (DDC area) 0 0 4 2 0 2 1 0 1 1 1.1
All watch days (total area) 29 24 23 15 15 15 14 9 11 10 16.5
Tornado watch days (total area) 9 6 11 8 10 5 10 1 6 5 7.1
Severe thunderstorm wl;\tch days (Total Area) 16 12 6 4 .'i 10 4 8 5 5 7.5
Aviation watch days (total area) 4 6 6 3 4.8-
All watch days (DDC area) 19 13 15 8 9 9 12 5 5 4 9,9
Tornado watch days (DDC area) 8 2 9 4 6 4 7 0 4 3 4,7
- Based on period 1965-68,
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3) Total area tornado watches - Watch information from the to-
tal area is taken into. consideration but operations are cancelled
only upon the issuance of tornado watches.