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Appendix B provides a list of major cities in the U.S. along with the 1-hour duration, 100-year occurrence rainfall rate. Rainfall rates, in inches per hour, are based on a storm of 1-hour duration and a 100-year return period.
This dataset contains historical hourly precipitation observations for selected U.S. stations. Data values are typically delayed six months or more. Dataset Citation
Specifically, for most jurisdictions, we refer to Fig. 1106.1 of the International Plumbing Code (IPC), 3 which provides 100-year, 1-hour (60-minute) rainfalls for various regions of the United States, or IPC Appendix B, “Rainfall Rates for Various Cities.”
The Precipitation Frequency Data Server (PFDS) is a point-and-click interface developed to deliver NOAA Atlas 14 precipitation frequency estimates and associated information. Upon clicking a state on the map above or selecting a state name from the drop-down menu, an interactive map of that state will be displayed.
What this means is described in detail below, but a short explanation is that, according to historical data about rainfall and stream stage, the probability of Soandso River reaching a stage of 20 feet is once in 100 years. In other words, a flood of that magnitude has a 1 percent chance of happening in any year. What is a recurrence interval?
rainfall rates in inches per hour for rain events having a duration of 1 hour and a return period of 100 years. Knowing the code sets minimum standards, it is possible for designers to exceed code and use more conservative rainfall inten-sity data—such as a 100-year, 15-minute or 100-year, 5-minute rainfall intensity—for the cities
NOAA's Precipitation Frequency Data Server (PFDS) and associated sites provides statistics on rates of rain over various time periods. These data are useful for calculating capacity for culverts and bridges. Watch a brief video on how to use the tool »
These data include quality controlled daily, monthly, seasonal, and yearly measurements of temperature, precipitation, wind, and degree days as well as radar data and 30-year Climate Normals. Customers can also order most of these data as certified hard copies for legal use.
NOAA Atlas 2 is a precipitation-frequency document defining the return periods for 2, and 100 years, and 6 and 24-hour precipitation return periods. For more information on return periods, see the web site for the Hydrometeorological Design Studies Center.
Ratio of Probable Maximum 6 Hour Rainfall to 100 Year 6 Hour Rainfall (inches) NOAA Precipitation Frequency Data Server ==> Return to Main Hydrology Page <== Radar. Current Weather. Rivers & Lakes. Satellite. Forecast Maps. Hour by Hour Forecast. Winter Weather. Graphical Hazards. Forecasters' Discussion. Regional Radar.