Sean Casey

Headshot photo of Sean Casey.

Research Interests

Observing System Simulation Experiements (OSSEs).

Sean Casey, Ph.D.

Associate Scientist, Hurricane Research Division


 5830 University Research Ct
College Park, MD 20740

June 26, 1990, the day I realized I wanted to be a meteorologist. I was 6. The day before, the temperature had reached 120℉ (49℃) in my hometown of Phoenix, AZ. My parents had me watching the news, and I remember the TV meteorologist saying the temperature the next day would “only” be 119 degrees. Turns out it got up to 122℉ (50 ℃) that day! Being six, it was the first time I noticed that the person on TV didn’t tell us exactly what the temperature would be the next day, which started me on a lifelong journey to learning more about how the atmosphere works.

Dr. Sean Casey currently works in simulated environments, using global simulations of Earth’s meteorology to simulate new and current observations, with the goal of improving the medium-range (3-7 day) forecast skill.  He has worked with members of the AOML Observing System Simulation Experiment (OSSE) team since 2012, before officially joining AOML in 2016.  Sean is particularly interested in characterization of instrument errors in simulated observations, model-state adjustments needed to match real-world model performance, and application of new methodologies in ways where an OSSE can be informative in how those methodologies are used in real-world model analyses and forecasts.

While he is proud to be a member of the OAR/AOML family, Sean does his work in College Park, MD, at the NOAA Center for Weather and Climate Prediction (NCWCP).  This allows him to work closely with scientists in NESDIS/STAR and NWS/NCEP/EMC, sharing lessons learned within AOML-led projects while also tracking developments in observations and modelling of importance to AOML/HRD.

Current Work

Observing System Simulation Experiments (OSSEs)

Observing System Experiments (OSEs)

2009, Ph.D. Department of Atmospheric Sciences, Texas A&M University, College Station, TX

2007, M.S. Department of Atmospheric Sciences, Texas A&M University, College Station, TX

2005, B.S. Atmospheric Sciences, University of Washington, Seattle, WA

  1. Casey, S.P.F., and L. Cucurull. The impact of data latency on operational global weather forecasting. Weather and Forecasting, 37(7):1211-1220, 2022
    Ref. 4107
  2. Cucurull, L., and S.P.F. Casey. Improved impacts in observing system simulation experiments of radio occultation observations as a result of model and data assimilation changes. Monthly Weather Review, 149(1):207-220, 2021
    Ref. 3896
  3. Mueller, M.J., A.C. Kren, L. Cucurull S.P.F. Casey, R.N. Hoffman, R. Atlas, and T.R. Peevey. Impact of refractivity profiles from a proposed GNSS-RO constellation on tropical cyclone forecasts in a global modeling system. Monthly Weather Review, 148(7):3037-3057, 2020
    Ref. 3801