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There is an error in the original announcement. The date of the seminar is February 5, Thursday of the next week.
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<p class="MsoNormal" style="margin: 0in; line-height: normal;"><font face="Times New Roman, serif" size="3">DATE: Thursday, February 5<o:p></o:p></font></p>
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<span style="font-family: "Times New Roman", serif;">TIME: 3-4 PM<o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">LOCATION: EOA 1044 <o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">SPEAKER: Dr. Cheng Zheng<o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">TITLE: Tropical-extratropical Interactions on Subseasonal-to-seasonal Time Scales: Dynamics and Predictions<o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;"><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffsu.zoom.us%2Fj%2F95168590030&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cf0cbf3d5d0a040ef7fd008de5f3eca24%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639052920433572852%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ISZSI7Xv1dnaczwfEk%2BGXll1z%2F5VPTvuMfAToYmoR2M%3D&reserved=0" originalsrc="https://fsu.zoom.us/j/95168590030" originalsrc="https://fsu.zoom.us/j/95168590030" style="color: rgb(150, 96, 125);">https://fsu.zoom.us/j/95168590030</a><o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">Meeting ID: 951 6859 0030 <o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">Abstract: </span></p>
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<span style="font-family: "Times New Roman", serif;">Tropical-extratropical interactions has been recognized as one of the key drivers of subseasonal predictability. The Madden-Julian Oscillation (MJO), the dominant mode of tropical intraseasonal variability, excites
Rossby waves that propagate into the extratropics, influencing surface temperature and precipitation via teleconnections. A better understanding of these teleconnections could lead to improvements in subseasonal predictions.<o:p></o:p></span></p>
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<span style="font-family: "Times New Roman", serif;">In this talk, I will first examine the observed MJO teleconnections and the associated Rossby waves. Next, by using an idealized dynamical model, I will explore how various factors modulate these teleconnections,
focusing on: (1) the role of MJO propagation and lifetime, and (2) the influence of the extratropical background state on the propagation of MJO-induced Rossby waves. Then, I will discuss the role of MJO teleconnections in subseasonal winter precipitation
predictions. Current dynamical models achieve prediction skill for extratropical cyclones—which bring most of the winter precipitation—primarily through ENSO and stratospheric influences. However, MJO-driven impacts on extratropical cyclones remain inadequately
represented, presenting opportunities for future improvement. Finally, I will introduce a newly developed machine learning framework that leverages ENSO and MJO teleconnections to predict winter precipitation on subseasonal timescales. This machine learning
tool outperforms traditional statistical models, offering a promising path for improving subseasonal predictions.<o:p></o:p></span></p>
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<blockquote type="cite">
<div>On Jan 28, 2026, at 9:09 PM, eoas-seminar--- via Eoas-seminar <eoas-seminar@lists.fsu.edu> wrote:</div>
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<span style="font-family: "Times New Roman", serif;">Dear all, <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;"> <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">Please join us for a MET seminar, which will be at 3:00PM on Feb. 5 (Thursday) in EOAS 1044, given by Dr. Cheng Zheng from Stony Brook University. His seminar is entitled “Tropical-extratropical Interactions
on Subseasonal-to-seasonal Time Scales: Dynamics and Predictions”<i><span style="background: white;"> </span></i><span style="background: white;">(abstract below)</span><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;"> <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">DATE: Tuesday, January 20 <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">TIME: 3-4 PM<o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">LOCATION: EOA 1044 <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">SPEAKER: Dr. Cheng Zheng<o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;">TITLE: Tropical-extratropical Interactions on Subseasonal-to-seasonal Time Scales: Dynamics and Predictions<o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;"> </span></p>
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<span style="font-family: "Times New Roman", serif;"><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffsu.zoom.us%2Fj%2F95168590030&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cf0cbf3d5d0a040ef7fd008de5f3eca24%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639052920439883756%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=pHVv9SHCykjr%2FIge19P9BFnHpkCeey6eG5AKfE8kgA4%3D&reserved=0" originalsrc="https://fsu.zoom.us/j/95168590030" originalsrc="https://fsu.zoom.us/j/95168590030" style="color: rgb(150, 96, 125);">https://fsu.zoom.us/j/95168590030</a><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;"> </span></p>
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<span style="font-family: "Times New Roman", serif;">Meeting ID: 951 6859 0030 <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman", serif;"> </span></p>
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<span style="font-family: "Times New Roman", serif;">Abstract: </span><span style="font-family: "Times New Roman", serif;"><o:p></o:p></span></div>
<div style="margin: 0in; line-height: normal; font-size: medium; font-family: Aptos, sans-serif;">
<span style="font-family: "Times New Roman", serif;">Tropical-extratropical interactions has been recognized as one of the key drivers of subseasonal predictability. The Madden-Julian Oscillation (MJO), the dominant mode of tropical intraseasonal variability, excites
Rossby waves that propagate into the extratropics, influencing surface temperature and precipitation via teleconnections. A better understanding of these teleconnections could lead to improvements in subseasonal predictions.<o:p></o:p></span></div>
<p class="MsoNormal" style="margin: 0in; line-height: normal; font-size: medium; font-family: Aptos, sans-serif;">
<span style="font-family: "Times New Roman", serif;"> </span></p>
<div style="margin: 0in; line-height: normal; font-size: medium; font-family: Aptos, sans-serif;">
<span style="font-family: "Times New Roman", serif;">In this talk, I will first examine the observed MJO teleconnections and the associated Rossby waves. Next, by using an idealized dynamical model, I will explore how various factors modulate these teleconnections,
focusing on: (1) the role of MJO propagation and lifetime, and (2) the influence of the extratropical background state on the propagation of MJO-induced Rossby waves. Then, I will discuss the role of MJO teleconnections in subseasonal winter precipitation
predictions. Current dynamical models achieve prediction skill for extratropical cyclones—which bring most of the winter precipitation—primarily through ENSO and stratospheric influences. However, MJO-driven impacts on extratropical cyclones remain inadequately
represented, presenting opportunities for future improvement. Finally, I will introduce a newly developed machine learning framework that leverages ENSO and MJO teleconnections to predict winter precipitation on subseasonal timescales. This machine learning
tool outperforms traditional statistical models, offering a promising path for improving subseasonal predictions.<o:p></o:p></span></div>
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