Texas Atlas 14 Rainfall Map
See NOAA Atlas 14 rainfall depths for any Texas address, coordinates, or site boundary.
Screening only — NOAA point values; your drainage manual may set its own design depths. Read the disclaimer.
Zipped shapefile (.shp, .shx, .dbf, and .prj), GeoJSON, or KML, up to 2,000 acres. Your file is read in your browser and is not uploaded. The page reads the rainfall values from data files on this site in blocks about 55 km across, so only the block that holds the site is requested; HERO E&C does not receive or store your file.
Click the map to add corners. Click the first corner or press Finish boundary to close. Backspace removes the last corner; Esc cancels.
You can also click any point on the map. Click the map, then scroll to zoom, or hold Ctrl and scroll; click outside the map to scroll the page. On a phone, use two fingers.
Results
Search an address, enter coordinates, upload or draw a boundary, or click the map. Results appear here with the NOAA values, their source and links to check them at NOAA.
How to read the results
- Depth, duration and frequency
- Each value is the rainfall depth, in inches, that falls in the stated duration (5 minutes to 10 days) with the stated average recurrence interval (1 to 1,000 years). The table is NOAA's depth-duration-frequency table for the grid cell that holds the point.
- "100-year" storm
- A depth with a 1% chance of being equaled or exceeded in any year (an average recurrence interval of 100 years). It can happen in back-to-back years.
- Partial-duration vs. annual maximum
- The tool shows NOAA's partial-duration series (PDS), the PFDS default, which counts every large storm. Annual maximum series (AMS) values count only the largest storm of each year and are lower for frequent storms. Some manuals call for AMS; the results link to NOAA's AMS values for the same point.
- Confidence limits
- NOAA also publishes 90% confidence limits for every value. They are not repeated here; open PFDS from the result to see them.
- Point vs. area
- Atlas 14 values are point estimates. For a boundary, the tool lists the value at its center and the lowest and highest grid cell values inside it. It does not apply an areal reduction factor or average depths over the site.
- Grid cells and rounding
- NOAA's Texas grid has cells of 30 arc-seconds, about 0.8 km. Values are stored in thousandths of an inch, as NOAA publishes the grids, and rounded the way PFDS displays them. In a check of 22 Texas points (3,300 values), every value matched PFDS.
Known gaps
- Your city, county or TxDOT may require its own design depths, zones or series. Use the values your reviewing manual specifies.
- NOAA is preparing Atlas 15, which will replace Atlas 14. Its preliminary values are for review, not design. This page will move to Atlas 15 when NOAA publishes final values.
- Only partial-duration mean values are stored here. Annual maximum values and the 90% confidence limits are one link away at NOAA PFDS.
- The map colors group depths into up to eight classes for display only. Read values from the results, not from the map.
- No areal reduction factor, design storm, hyetograph or runoff is computed.
- Address search can place a point on the wrong side of a street. Check the marker, and click the correct spot on the map if needed.
- KMZ files are not supported yet; save the boundary as KML or GeoJSON.
- Opportunity pins mark the city or county named in the notice, not the project site; listings without a city or county have no pin.
Disclaimer
Informational screening only. This tool displays public precipitation frequency estimates from NOAA Atlas 14 Volume 11 Version 2.0 (Texas), prepared from the NOAA/NWS grids, and U.S. Census Bureau address search. The values are NOAA point estimates for one grid cell; they are not a design storm, a site-specific rainfall study, or a sealed engineering document, and they have not been reviewed by a licensed professional for your property. Do not use them for design, construction, bidding, or permitting.
Local drainage criteria decide which rainfall depths, series and distributions apply to a design. Confirm with NOAA PFDS and the reviewing engineer for your city or county.
Using this tool does not create an engineer–client relationship. Files you upload are read in your browser and are not uploaded. The address you enter is sent to the public address service listed above, map tiles come from USGS, and the rainfall values are read from data files on this site in blocks about 55 km across. HERO E&C does not store your searches or files. HERO E&C · TBPELS Firm F-27793.
Data sources
| Layer | Source | Currency |
|---|---|---|
| Rainfall depths | NOAA Atlas 14 Volume 11 Version 2.0, NOAA/NWS Hydrometeorological Design Studies Center (public domain): partial-duration series mean grids for Texas | Published 2018; grid files dated Aug 2024 on the NOAA server; prepared for this page Oct 2026 |
| Rainfall time patterns | NOAA Atlas 14 Volume 11 temporal distribution areas and CSV files (NOAA/NWS HDSC); outline simplified | As published by NOAA |
| Basemaps | USGS The National Map (public domain) | As served by USGS |
| Address search | U.S. Census Bureau Geocoder | Current address ranges |
| Texas outline | U.S. Census Bureau TIGERweb (public domain); outline simplified | Fetched Oct 2026 |
| Teaming opportunities | HERO E&C Teaming & Opportunities (/teaming/) and Construction Teaming (/construction/) listings | Updated with each listing review; pins at the city or county named in the notice |
Citation: Perica, S., et al. (2018). NOAA Atlas 14 Volume 11 Version 2.0: Precipitation-Frequency Atlas of the United States, Texas. NOAA, National Weather Service, Silver Spring, MD. Map software: ArcGIS Maps SDK for JavaScript. Powered by Esri. Compare any result in NOAA PFDS.
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