WarnUS retrieves text data for tornado, severe thunderstorm, and flash flood warnings from the United States National Weather Service. The text for these warnings is generated through somewhat automated means and usually follows a set format that is easily processed by WarnUS. However, because a human has the final say on how the warning is ultimately formatted, it is possible, although unlikely, for a warning to be formatted in such a way that it is incorrectly or mistakenly interpreted by WarnUS. Furthermore, the United States National Weather Service's servers may also experience problems that cause WarnUS to retrieve bad, missing, incomplete, unreachable, or otherwise unrecognizable data. While every effort is made to ensure WarnUS is as reliable and accurate as possible, instances of unexpected or faulty behavior can arise. WarnUS and its author are not responsible for any damages, injuries, or losses that arise out of the use of WarnUS. If you discover a problem with WarnUS, you are encouraged to report it to ContactWarnUS@gmail.com as soon as possible. Guidelines for reporting problems can be found in the documentation page under the section labeled "Reporting Problems With WarnUS".
     For the purposes of summarizing data concisely, WarnUS may present information that does not appear exactly as it is in actual warning messages. For example, a standard severe thunderstorm warning may have hazards listed as "60 mph wind gusts and quarter size hail". In this case, the summarized hazards and the original hazard list would be identical. If a severe thunderstorm warning contains a "Tornado...Possible" tag*, the summarized hazard would read "60 mph wind gusts and quarter size and a possible tornado", as opposed to just saying "60 mph wind gusts and quarter size hail" (as it would appear in the actual warning). This is not intended to be misleading. If anything, it is intended to provide more information about a particular warning that otherwise might be overlooked or missed. Another example is for tornado warnings that have confirmed tornadoes. Lower-tier and upper-tier (more serious) tornado warnings would both have the hazards listed as "Damaging tornado" in the original warning text. Therefore, to distinguish between the two tiers of tornado warning, WarnUS will display "Confirmed tornado" as the hazard for the lower-tier warning and "Large and extremely dangerous tornado" as the hazard for the upper-tier warning**. Again, this is not intended to provide false or misleading information. In fact, it is intended to be more informative. It should also be noted that original, unmodified warning text can be retrieved by clicking on a warning summary.
     WarnUS and its author claim no affiliation, directly or indirectly, with the United States National Weather Service. WarnUS is in compliance with the the United States National Weather Service's Terms Of Use. The data provided by WarnUS and the United States National Weather Service is provided free of charge.
     WarnUS does not save any data or settings put into the site. All data input is saved locally in the user's own personal browser. No records are retained on the server on which WarnUS is hosted on.




* This appears in a severe thunderstorm warning if a particular storm may produce a tornado, but confidence is not high enough to issue a tornado warning.

** In general, WarnUS will display upper-tier warnings differently than other warnings. If a warning poses a higher-than-normal threat to life and property, it will be bolded and colored differently to distinguish it from other warnings.