prospects from climate model simulations that a gradually warming world will be accompanied by changes in the variability and frequency of weather and climate extremes. For all these reasons monitoring changes and variations in weather and climate extremes and assessing what we know and do not know regarding future changes is important for both socio-economic and environmental interests. Therefore, it is timely to undertake an in-depth assessment of the state of our knowledge for North America, where we live, work, grow much of our food, etc.

Extreme weather and climate events span many weather and climate variables, and an important aspect of this synthesis and assessment report will be to identify those key variables or indices that may provide important information related to socio-economic or environmental impacts. Identifying recent changes and trends in these parameters will be a focus of the report, as well as identifying what can be said about future changes. Examples of some of the key variables include temperature-related parameters (severe freezes, heat waves), precipitation-related parameters (wet spells, heavy precipitation events, droughts), tropical and extra-tropical storm frequency and intensity, ice and hail, snow cover and depth, etc. Since extreme weather and climate events on a global scale are regularly addressed in international assessments, this CCSP Synthesis and Assessment Report will focus on weather and climate extremes primarily across Canada, Mexico, and the United States, including its territories.

In accordance with CCSP guidelines, the synthesis and assessment products are intended to support informed discussion and decision-making regarding climate variability and change by policy makers, resource managers, stakeholders, the media, and the general public. This report also should have particular value to ongoing free-trade agreements (Canada, U.S., and Mexico) and bi-lateral and multi-lateral agreements related to the management of natural resources in North America.

Contact Information for Responsible Individuals at the Lead and Supporting Agencies

The National Oceanic and Atmospheric Administration (NOAA) is the lead agency for this synthesis and assessment product. Relevant agency personnel are presented in the following table:

CCSP Member Agency

Agency Leads

Department of Commerce (NOAA)

Thomas Karl, Christopher Miller

Department of Energy

Anjuli Bamzai

National Aeronautics and Space Administration

Don Anderson, Tsengdar Lee

U.S. Geological Survey

Tom Armstrong

Lead Authors: Required Expertise of Lead Authors and Biographical Information for Proposed Lead Authors

The author team for this Product will be constituted as a Federal Advisory Committee in accordance with the Federal Advisory Committee Act (FACA) of 1972 as amended, 5 U.S.C. App.2. Each author team member shall be appointed for a term of two years, and will serve at the discretion of the Under Secretary of Commerce for Oceans and Atmosphere. Appointments are renewable for additional terms. Committee members will include non-Federal experts and

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