Tidy Data and Workflow Layer for Epidemic Nowcasting R package tbl.now version 1.0.0 Defines tidy data structures and package-agnostic workflows for epidemiological nowcasting. The 'tbl_now' class records event, report, and revision dates alongside strata, covariates, censoring, and reporting-delay metadata while remaining compatible with 'dplyr'. Tools support validation, manipulation, diagnostics, visualization, format conversion, retrospective evaluation, and multiple modelling engines. The 'tbl_nowcast' class standardizes probabilistic predictions for plotting, scoring, comparison, and ensembling. Software Depends: R (>= 4.2.0) Imports: cli, generics, grid, dplyr, ggplot2, lifecycle, lubridate, methods, pillar, rlang, S7, scales, stats, tibble, tidyr, tidyselect, utils Suggests: almanac, baselinenowcast (>= 0.2.1), diseasenowcasting (>= 2.4.0), data.table, epidist (>= 0.4.1), EpiNow2 (>= 1.9.0), epinowcast (>= 0.7.0), knitr, modifiedmk (>= 1.6.0), NobBS (>= 1.1.1), patchwork, plotly, rmarkdown, scoringutils (>= 2.0.0), surveillance (>= 1.26.1), testthat (>= 3.0.0), tsibble, withr Rodrigo Zepeda-Tello <rzepeda17@gmail.com> Comprehensive R Archive Network (CRAN) Rodrigo Zepeda-Tello [aut, cre] (ORCID: <https://orcid.org/0000-0003-4471-5270>), Rami Yaari [aut] (ORCID: <https://orcid.org/0000-0002-8808-8937>), Matteo Perini [aut] (ORCID: <https://orcid.org/0000-0002-9465-6216>), Teresa Yamana [ctb] (ORCID: <https://orcid.org/0000-0001-8349-3151>), Jeffrey Shaman [ctb] (ORCID: <https://orcid.org/0000-0002-7216-7809>), Columbia University in the City of New York [cph, fnd] MIT + file LICENSE (https://CRAN.R-project.org/package=tbl.now/LICENSE) 2026-09-21 application/tgz https://CRAN.R-project.org/package=tbl.now doi:10.32614/CRAN.package.tbl.now