Presentations

2024
Powell, S. W., 2024: What Controls Timing of Deep Convective Onset in the Tropics? (Hint: Much than only an environmental thermodynamic profile). 36th Conf. on Hurricanes and Tropical Meteorology, Long Beach, CA, 1D.1.

2023
Powell, S. W., 2023: Do Boundary Layer Eddy Size Distributions Link to Cumuliform Cloud Populations Deepening?. 2023 AGU Fall Meeting, San Francisco, CA, A12C-05.

Bazemore, D. W. and S. W. Powell, 2023: Cloud Updraft Dynamics and Growth in Terrain-Forced Convection. 2023 AGU Fall Meeting, San Francisco, CA, A23H-2466.

Bazemore, D. W., and S. W. Powell, 2023: Connecting Sub-Cloud Layer Eddies to Cloud Updraft Size and Growth over Oceans and in Terrain-Forced Convection. 2023 DOE ARM/ASR PI Meeting, North Bethesda, MD, poster.

Powell, S. W., 2023: Does Deep Convective Onset Require a Critical Updraft Acceleration?. 3rd Symposium on Mesoscale Processes, 2023 AMS Annual Meeting, Denver, CO, 6.1.

Wasserman, J. B., S. W. Powell, and J. Mulholland, 2023: Influences of Vertical Wind Shear on Updraft Accelerations in Simulated Convection. 3rd Symposium on Mesoscale Processes, 2023 AMS Annual Meeting, Denver, CO, 688.

2022
Bazemore, D. W. and S. W. Powell, 2022: Sensitivity of Idealized Updraft Accelerations to Relative Humidity, Vertical Wind Shear, and Radius Size. 2022 AGU Fall Meeting, Chicago, IL, A42R-1937. Also presented at 2023 AMS annual meeting.

Powell, S. W. and J. B. Wasserman, 2022: The CALifornia Investigation of Convection over Ocean (CALICO). 2022 AGU Fall Meeting, Chicago, IL, A42G-06.

Ortiz, P, E. G. Casas, M. Orescanin, S. W. Powell, V. Petkovic, 2022: Towards Trusting Synthetic Microwave Retrievals: Introducing Uncertainty Quantification in a New Bayesian Convolutional Neural Network Architecture. 2022 AGU Fall Meeting, Chicago, IL, H35M-1292. Also presented at 2023 AMS Annual Meeting

Bazemore, D. W., and S. W. Powell, 2022: Sensitivity to Idealized Updraft Accelerations to Relative Humidity and Vertical Wind Shear. 2022 DOE ARM/ASR PI Meeting, Rockville, MD, poster.

Powell, S. W., 2022: . 2022 DOE ARM/ASR PI Meeting, Rockville, MD, CACTI Breakout Session.

Powell, S. W., 2022: The CALifornia Investigation of Convection over Ocean (CALICO): Negatively Buoyant Updrafts Rooted in Cold Pools. 16th AMS Conf. on Cloud Physics, Madison, WI. 2.2.

Powell, S. W., J. M. Peters, J. P. Mulholland, B. Fan, D. W. Bazemore, J. B. Wasserman, 2022: Convective Transitions from Shallow Cumuli to Deep Cumulonimbi. 3rd GEWEX Pan-GASS Meeting, Monterey, CA.

Powell, S. W., 2022: Critical In-Cloud Acceleration for Shallow-to-Deep Convective Transition in Marine Tropical Cumuli. 35th Conf. on Hurricanes and Tropical Meteorology. New Orleans, LA, 14A.8.

2021
Powell, S. W., 2021: What Controls Shallow to Deep Convective Transitions of Cloud Populations in Moist Envrionments?. 2021 AGU Fall Meeting. Virtual, A21A-07.

Powell, S. W., 2021: Critical Updraft Quantities in LES Models of Shallow to Deep Convective Transitions. Tropical Pacific Observing Needs to Advance Process Understanding and Representation in Models Workshop. US CLIVAR. 25 May 2021. Virtual.

Powell, S. W., 2021: Observing the Shallow Convection Part of the Deep Convective Life Cycle. Tropical Pacific Observing Needs to Advance Process Understanding and Representation in Models Workshop. US CLIVAR. 26 May 2021. Virtual.

Powell, S. W., 2021: Vertical Updraft Accelerations and Convective Life Cycle Transitions. 34th Conf. on Hurricanes and Tropical Meteorology. Virtual. 3A.1.

2020
Heslin, S. C, S. W. Powell, and M. Orescanin, 2020: Emulating tropical marine radar reflectivity by applying a convolutional neural network to geostationary satellite radiances. American Geophysical Union Fall Meeting, Virtual. H141-0009.

Powell, S.W., 2020: Low free ropospheric static stability controls on tropical convection in moist environments, Tropical Meteorology and Tropical Cyclones Symposium, 100th AMS Annual Meeting, Boston, MA. J48.2.

Powell, S.W. and M.M. Bell, 2020: Near-surface frontogenesis and atmospheric instability along the U.S. East Coast during the extratropical transition of Hurricane Matthew (2016), Tropical Meteorology and Tropical Cyclones Symposium, 100th AMS Annual Meeting, Boston, MA. 1490.
Also presented at 34th Conference on Hurricanes and Tropical Meteorology

2019
Powell, S.W., 2019: Free-tropospheric static stability controls on tropical convection in moist environments, American Geophysical Union Fall Meeting, San Francisco, CA. A41I-2770.

Powell, S.W., 2019: An observational view of the tropical convective cloud life cycle, 14th NOAA Climate and Global Change Summer Institute, Steamboat Springs, CO (07/16).

Powell, S.W., 2019: Inhibition of tropical maritime rainfall in moist environments, Workshop on Atmospheric Convection and Air-Sea Interaction over the Tropical Oceans, US CLIVAR, Boulder, CO.

Powell, S.W., and B. Dolan, 2019: Radar-derived estimation of rain rate and its uncertainty in data sparse regions, 33rd Conference on Hydrology, 99th AMS Annual Meeting, Phoenix, AZ. 12A.1.

Powell, S.W., 2019: Rainfall minima during periods of high relative humidity in tropical maritime regions, 7th Symposium on the Madden-Julian Oscillation and Sub-Seasonal Monsoon Variability, 99th AMS Annual Meeting, Phoenix, AZ. 306.

2018
Powell, S.W., 2018: Observations of convection obtained over the West Pacific during PISTON 2018, Pacific Northwest National Laboratory, Richland, WA (11/28).

Powell, S. W., and M. M. Bell, 2018: Drivers of extreme rainfall during the extratropical transition of Hurricane Matthew (2016), 33rd Conference on Hurricanes and Tropical Meteorology, Ponte Vedra Beach, FL. 240.

Powell, S.W., 2018: The evolving forms of circumnavigating, successive MJOs, 33rd Conference on Hurricanes and Tropical Meteorology, Ponte Vedra Beach, FL. 13A.2

Solomon, J. R., S. W. Powell, J. W. Whitaker, and E. D. Maloney, 2018: Atmospheric river activity in a 4xCO2 climate simulation, 31st Conference on Climate Variability and Change, 98th AMS Annual Meeting, Austin, TX. 1007.

2017
Powell, S. W., R. A. Houze, Jr., S. R. Brodzik, B. Dolan, P. Hein, S. A. Rutledge, W. Xu, and E. J. Thompson, 2017: An updated rain-type classification for rain rate estimation and identifying shallow convection, 17th Conf. on Mesoscale Processes, San Diego, CA. 60.

Powell, S. W., and M. M. Bell, 2017: Mesoscale distribution of intense rainfall in eastern North Carolina during Hurricane Matthew (2016), 17th Conf. on Mesoscale Processes, San Diego, CA. 12.

Powell, S. W., 2017: Multi-scale dynamics of MJO convective onset during DYNAMO, 17th Conf. on Mesoscale Processes, San Diego, CA. 1.2.

Powell, S. W., 2017: Successive, circumnavigating MJO propagation as a Kelvin wave and a moisture wave, 2017 European Geosciences Union General Assembly, Vienna, Austria. EGU2017-3810.

Powell, S. W., 2017: Circumnavigation and Convective Onset of Successive MJO Events, Yale University AOCD Seminar (02/23) and Harvard University ClimaTea Lecture (02/24).

Powell, S. W., 2017: Isolated tropical convection viewed by dual-polarimetric radar, Robert A. Houze, Jr. Symposium, 97th American Meteorological Society Annual Meeting, Seattle, WA. 376.

Powell, S. W., 2017: Making radar great (again?): Bob's contributions to understanding co-dependence between mesoscale convection and the MJO, Robert A. Houze, Jr. Symposium, 97th American Meteorological Society Annual Meeting, Seattle, WA. 3.6.

2016
Powell, S. W., 2016: MJO Propagates as a coupled buoyancy wave in Western Hemisphere and moisture wave over warm pool, American Geophysical Union Fall Meeting, San Francisco, CA. A31H-0150. (Also presented at 2017 AMS annual meeting.)

Powell, S. W., 2016: Clouds, Kelvin Waves, and Convective Onset in the Madden-Julian Oscillation, Colorado State University Atmos. Sci. Colloquium, 26 Aug. 2016

Powell, S. W., 2016: Cumuliform moistening and 700-850 mb updraft buoyancy before MJO convective onsets, 32nd Conference on Hurricanes and Tropical Meteorology, San Juan, PR, American Meteorological Society, 18B.7.

Powell, S. W., R. A. Houze, Jr., and S. R. Brodzik, 2016: Overcoming Challenges in Identifying Isolated Tropical Convection, University of Washington, Atmos. Physics and Chemistry Seminar, 4 Apr 2016.

Powell, S. W., 2016: Dynamics of Large-Scale Convective Onset in the Madden-Julian Oscillation, University of Washington, Ph.D. Defense, 11 Mar 2016.

2015
Powell, S. W., 2015: Relevance of Large-Scale Vertical Motions and Cumuliform Buoyancy to MJO Convective Onset, American Geophysical Union Fall Meeting, San Francisco, CA. A21M-06.

Powell, S. W., 2015: Dynamics of MJO Convective Onset during DYNAMO, NOAA/ESRL/PSD, Boulder, CO (also at NCAR and Univ. of Reading, Oct. 2015)

Powell, S. W., and R. A. Houze, Jr., 2015: Large-scale Vertical Motions and MJO Convective Onset, 2015 Atmospheric System Research Science Team Meeting, Tysons Corner, VA, U.S. Dept. of Energy.

2014
Powell, S. W., and R. A. Houze, Jr., 2014: Evolution of Humidity and Convection Prior to MJO Onset and Their Sensitivties to Upper-Tropospheric Equatorial Wave Dynamics, 31st Conf. on Hurricanes and Tropical Meteorology, San Diego, CA, American Meteorological Society, 7B.8.

Powell, S. W., 2014: An Upper-tropospheric Role in MJO Convective Onset, Pacific Northwest National Laboratory, Richland, WA, 11 June 2014.

Powell, S. W., and R. A. Houze, Jr., 2014: The Role of Upper-Tropospheric Dynamics in MJO Convective Onset, 2014 Atmospheric System Research Science Team Meeting, Potomac, MD, U.S. Dept. of Energy.

Powell, S. W., and R. A. Houze, Jr., 2014: Convective Onset of the Madden-Julian Oscillation, 2nd Symposium on Prediction of the Madden-Julian Oscillation, 94th AMS Annual Meeting, Atlanta, GA, American Meteorological Society, J4.6.

2013
Powell, S. W., and R. A. Houze, Jr., 2013: Radar-based and Large-Scale Views of Convection and Tropospheric Humidity during DYNAMO/AMIE, 2013 AGU Fall Meeting, San Francisco, CA, American Geophysical Union, A31F-0160.

Powell, S. W., 2013: Radar-based and Large Scale Views of Convection and Humidity during AMIE-DYNAMO, 2013 Atmospheric System Research Fall Working Group Meeting, Rockville, MD, U.S. Dept. of Energy.

Powell, S. W., A. K. Rowe, and R. A. Houze, Jr., 2013: Tropospheric Humidification and Cloud Microphysical Structure Observed over the Indian Ocean during DYNAMO-AMIE, 2013 Atmospheric System Research Science Team Meeting, Potomac, MD, U.S. Dept. of Energy.

Powell, S. W., and S. R. Brodzik, 2013: An Improved Algorithm for Radar-derived Classification of Convective and Stratiform Echoes. MJO Field Data and Science Workshop, Kohala Coast, HI.

Powell, S. W., and R. A. Houze, Jr., 2013: Effects of Large-Scale Waves and Humidity on Convective Depth. MJO Field Data and Science Workshop, Kohala Coast, HI.

Powell, S. W., and R. A. Houze, Jr., 2013: Evolution of Tropospheric Humidity and Convection Prior to MJO Onset. MJO Field Data and Science Workshop, Kohala Coast, HI.

Powell, S. W., and R. A. Houze, Jr., 2013: The Cloud Population and Onset of the Madden-Julian Oscillation over the Indian Ocean during DYNAMO-AMIE. MJO Field Data and Science Workshop, Kohala Coast, HI.

Powell, S. W., 2013: Are Equatorial Kelvin Waves Chickens? An Updated Paradigm for MJO Onset, University of Washington Dynamics Seminar, Seattle, WA, 7 February 2013.

2012
Powell, S. W., C. Zhang, R. A. Houze, Jr., S. A. Rutledge, R. H. Johnson, C. Long, S. A. McFarlane, C. Schumacher, M. Katsumata, K. Yoneyama, N. Viltard, and S. S. Chen, 2012: The DYNAMO-AMIE International Field Campaign: Cloud Population of the Madden-Julian Oscillation. 16th International Conference on Clouds and Precipitation, Leipzig, Germany.

Powell, S. W., R. A. Houze, Jr., and A. Kumar, 2012: Modeling the role of anvil clouds in tropospheric humidification, 16th International Conference on Clouds and Precipitation, Leipzig, Germany.

Powell, S. W., R. A. Houze, Jr., A. Kumar, and S. A. McFarlane, 2012: Tropospheric Humidification by Anvil Clouds over the Indian Ocean. 30th Conference on Hurricanes and Tropical Meteorology, Ponte Vedra Beach, FL, American Meteorological Society.

2011
Powell, S. W., X. Zeng, R. A. Houze, Jr., and W-K. Tao, 2011: Heating rates of Observed and Simulated Anvil Clouds over Niamey. 2011 Atmospheric System Research Science Team Meeting, San Antonio, TX, U.S. Department of Energy.

2009
Powell, S. W. and D. S. Nolan, 2009: The moist static energy budget and wave dynamics around the ITCZ in idealized WRF simulations. 8th Conference on Coastal Atmospheric and Oceanic Prediction and Processes, Phoenix, AZ, American Meteorological Society, P4.1.

2008
Powell, S. W. and D. S. Nolan, 2008: Calculating the moist static energy budget around the ITCZ in idealized WRF simulations. 7th Annual Student Conference, New Orleans, LA, American Meteorological Society, P1.61.

Powell, S. W. and D. S. Nolan, 2008: Calculating the moist static energy budget around the ITCZ in idealized WRF simulations. 28th Conference on Hurricanes and Tropical Meteorology, Orlando, FL, American Meteorological Society, P1F.23

Powell, S. W., J.-W. Bao, C. W. Fairall, L. Bianco, and S. A. Michelson, 2008: Physics of Sea Spray: Impact on Tropical Cyclone Intensity. 3rd Annual NOAA Hollings Scholarship Student Presentations, Silver Spring, MD, NOAA.