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Southwest Weather Research, Inc. v. Rounsaville

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Brief Fact Summary.

Southwest Weather Research appealed a temporary injunction that prevented them from suppressing hail over Rounsaville’s property.

Synopsis of Rule of Law.

Landowners are entitled to the weather that occurs over their property.

Points of Law - Legal Principles in this Case for Law Students.

Property in a thing consists not merely in its ownership and possession, but in the unrestricted right of use, enjoyment and disposal.

View Full Point of Law

Southwest Weather Research (Southwest) flew planes that discharged a chemical substance to suppress hail and develop clouds. Rounsaville sued Southwest for trespass both for flying planes over his property and affecting the natural weather over his property. Rounsaville was granted a temporary injunction.


Whether landowners are entitled to the weather that occurs over their property?


Yes. The injunction against Southwest is upheld. Southwest’s actions were a trespass to Rounsaville’s right to the air over his property.


Under ad coelum, everything above and below a landowner’s property belongs to the landowner. Improper use of airspace above a landowner’s property constitutes trespass.

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