Weather Modification

All individuals and organizations intending to conduct weather modification activities are required to obtain a weather modification license and permit from the TDLR. Read More

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News and Updates

TDLR Proposes Administrative Rules

The Texas Department of Licensing and Regulation proposes amendments to the Weather Modification program rules (16 Texas Administrative Code, Chapter 79, §79.33). The proposed amendments implement recommendations from staff and the Department’s internal auditor.

The proposed rules are published in the September 28, 2018, issue of the Texas Register (43 TexReg 6425). The Department will accept comments on the proposal until October 29, 2018.

The Department encourages anyone interested in the Weather Modification program to review the rule proposal online. Comments may be submitted by email to

TDLR Notice of Rule Review

The Texas Department of Licensing and Regulation (Department) is reviewing the Weather Modification program (Title 16, Texas Administrative Code, Chapter 79) for re-adoption, revision, or repeal.

The Department will determine whether the reasons for adopting or readopting these rules continue to exist by answering the following questions for each rule:

  • Is it obsolete?
  • Does it reflect current legal and policy considerations?
  • Is it in alignment with the current procedures of the Department?

The Department encourages anyone interested in the Weather Modification program to review the Notice of Intent and current Chapter 79 rules online. Comments may be submitted by email to

Deadline for comments: September 24, 2018

Notice of a Vacancy on Weather Modification Advisory Committee

TDLR announces a vacancy on the Weather Modification Advisory Committee (Committee) established by Agriculture Code, Title 9, Weather and Climate, Chapter 301. The purpose of the Weather Modification Advisory Committee is to advise the Texas Commission of Licensing and Regulation (Commission) on legislation, policies, administration, research, and other matters related to the duties, powers, or function of the Texas Department of Licensing and Regulation under this chapter. This announcement is for the position of a businessman.

The Committee is composed of five members appointed by the presiding officer of the Commission, with the Commission’s approval. The members represent the following professional interests: Businessman; Engineer; Atmospheric Scientist; Attorney; and Agricultural Producer. Members serve at the will of the Commission.

Interested persons should submit an application on the Department website at Applicants can also request an application from the Department by telephone (800) 803-9202 or e-mail

Issued in Austin, Texas on October 26, 2016.

Brian Francis
Executive Director

Advisory Committee Meetings

November 15, 2018 Meeting

The Weather Modification Advisory Committee met November 15, 2018 in Austin. The agenda and the staff reports are available online. The meeting was archived and is available on TDLR's YouTube channel.

About Weather Modification

Weather Modification - Weather Modification – Focused efforts to produce additional rainfall using cloud seeding are widespread in much of West and South Texas during the growing season, which extends from early spring until autumn each year. In fact, areas where cloud seeding is concentrated covers about one-sixth of the land area of Texas. The seeding is done primarily for rainfall enhancement using aircraft and sophisticated weather radar data. Decisions to deploy aircraft and disperse seeding materials (both silver iodide and salts) are made by trained meteorologists licensed by TDLR specifically for weather modification. Aircraft are based at airports in various locations within the “target” areas of these projects, i.e. where the impact of seeding (more rainfall from thunderstorms) is intended.

TDLR’s weather modification program issues licenses and permits for these projects, almost all of which have been in operation for 20 years or longer. The licenses attest to the credentials and experience of the meteorologists who direct the seeding operations, while the permits pertain to specific regions where seeding is intended and where aircraft may operate. A licensee may conduct more than one project, each of which requires that a specific permit be issued before seeding can begin. The aim of regulating weather modification in Texas is to ensure that various methods of modifying the weather do not dissipate clouds nor inhibit their ability to produce rainfall to the detriment of people or property in the affected areas.

TDLR’s program also assists individuals, organizations and governmental bodies in the design of cloud-seeding operations, as well as monitoring ongoing seeding activities to ensure compliance with permits and helping to evaluate the impact of the seeding on “target” and neighborhood areas. It also administers federal grants for exploratory, and confirmatory, cloud-seeding studies and shares information on technological advances with other State agencies, organizations, and interested individuals.

Weather Modification Regulation

All individuals and organizations intending to conduct weather modification activities are required to obtain a weather modification license and permit from the TDLR. George Bomar (512-936-4313; is the contact person at TDLR for information on, and assistance with, the licensing and permitting of weather modification operations.

The Department relies on its staff, as well as the Weather Modification Advisory Committee, for recommendations on applications for weather modification licenses and permits. The Committee, consisting of an engineer, people in business, an attorney at law, and an agricultural producer, meets several times each year, usually in Austin, to review applications for licenses and permits.

For more information about the weather modification program, e-mail TDLR at