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Confluence
Operational Hydrology Advances Webinar Series

The CIROH seminar series — hydrologic research and forecast operations in one room, alternating monthly between CIROH science and partner operations. Formerly the R2O2R webinar series.

Register for the seriesFourth Thursday · 2:00 PM Central · Zoom
Next session
Thursday, August 27, 2026 · 2:00–3:00 PM Central
How Can We Improve the NEXRAD Network to Benefit Flood Prediction?

Where should the nation deploy its next radars, and why does radar rainfall estimation fail in the storms that kill? Krajewski and Smith present hydrologically centric analyses of the WSR-88D network that identify the highest-priority regions for new radar deployment and characterize the uncertainty in radar rainfall estimates from a drainage-network perspective.

Drawing on catastrophic flash floods in the Texas Hill Country, the Appalachians, and the Intermountain West, they show how vertical motion in storm downdrafts leads radar to underestimate exactly the rainfall that matters most, and they recommend developing dedicated radar QPE techniques for storms that produce catastrophic flash floods.

Season schedule · 2026–27
Two currents, one series
How Can We Improve the NEXRAD Network to Benefit Flood Prediction?Witek Krajewski & Jim Smith
The Weather Prediction Center: Research to OperationsDavid Novak & Jim Nelson
CIROH PI Engagement SessionNominate to present ↓
Operational Partner Session — Topic to Be AnnouncedSpeaker to be announced
FIRO — the CIROH–CW3E research and operations partnershipF. Martin Ralph
Flood Mapping Development and Operational UtilityDerek Giardino
CIROH PI Engagement SessionNominate to present ↓
Operational Partner Session — Topic to Be AnnouncedSpeaker to be announced
No December session — AGU Fall Meeting and holidays. 
CIROH PI Engagement Sessions
Nominate a presenter

The Oct 22 and Mar 25 sessions are open to CIROH principal investigators. Nominate yourself or a CIROH colleague you think should present — tell us about the project and what it would bring to the operational community, and we'll follow up.

PREFERRED SESSION
Submit nomination
Opens your email client with the nomination addressed to ciroh@ua.edu.
About the series
Research → Operations → Research

Confluence brings CIROH's research community and NOAA's operational water enterprise into the same hour. Sessions alternate between CIROH-funded science headed for operations, and operational perspectives from NOAA and partner agencies — so research is shaped by the people who will run it.

Cadence
Fourth Thursday of the month, 2:00–3:00 PM Central
Format
45-minute talk + 15-minute Q&A, on Zoom, recorded
Audience
CIROH researchers, operational partners, and broader research communities
Join us for the upcoming session

One registration covers the whole season — register once and the Zoom link arrives by email.