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WEBINAR SUMMARY:
The Office of Water Prediction (OWP) of the National Oceanic and Atmospheric Administration’s (NOAA) National Weather Service (NWS) is responsible for the development, production, and publication of national precipitation frequency estimates. These estimates, which are used to design and manage infrastructure projects, must be regularly revisited to account for new data and improved methodologies. Under the Bipartisan Infrastructure Law, NOAA received funding to update precipitation frequency estimates nationwide, building upon an existing framework developed for NOAA Atlas 14, but now to account for climate nonstationarity. Once complete, high-resolution gridded estimates will be published in two volumes of NOAA Atlas 15: Volume 1 will encompass present day and Volume 2 will provide estimates into the future. To facilitate understanding and to provide early insight into the development of NOAA Atlas 15, NOAA released pilot data over the state of Montana on a new web interface. Final estimates for U.S. states and territories are expected to be available in 2027. In this webinar, Dr. Janel Hanrahan will highlight features on the new Atlas 15 webpage, describe ongoing efforts to develop a national extreme time series data repository, and outline the frameworks used to generate both present-day and future estimates.

LEARNING OBJECTIVES:

1. Be able to access and navigate the NOAA Atlas 15 web interface.
2. Compare precipitation frequency estimates for present-day and in the future.
3. Distinquish between frameworks created for Atlas 15 Volumes 1 and 2.

SPEAKER:

Janel Hanrahan
Research Scientist
RTI International

Dr. Janel Hanrahan is a hydroclimatologist and member of the Center for Water Resources group at RTI International. Her expertise lies in climate dynamics and hydroclimatological processes, climate modeling, and data analysis. Dr. Hanrahan is currently contributing to the creation of NOAA Atlas 15, a database of authoritative present-day and future precipitation frequency estimates that will inform the design of national infrastructure projects under a changing climate. Before joining RTI in 2023, Dr. Hanrahan was an associate professor and chair of atmospheric sciences at Vermont State University.

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