Changelog

• 2024-08-14: Initial documentation and pydantic validation

Example Requests

Return all Des Moines Tornado Warnings for 2024

https://mesonet.agron.iastate.edu/json/vtec_events_bywfo.py?wfo=DMX&year=2024&phenomena=TO&significance=W

Same request, csv format

https://mesonet.agron.iastate.edu/json/vtec_events_bywfo.py?wfo=DMX&year=2024&phenomena=TO&significance=W&fmt=csv

Same request, xlsx format

https://mesonet.agron.iastate.edu/json/vtec_events_bywfo.py?wfo=DMX&year=2024&phenomena=TO&significance=W&fmt=xlsx

CGI Arguments

The following table lists the CGI arguments that are accepted by this service. A HTTP GET request is required. Fields of type Multi-Params or CSV value can accept either a comma separated list or multiple parameter and value combinations. For example, ?foo=1&foo=2 is equivalent to ?foo=1,2.

Field	Type	Description
callback	string or null	Legacy JSON-P style callback. It is likely best to not depend on this usage. The IEM website has a permissive CORS.
fmt	string	The format of the response, either json or csv or xlsx
start	string	Start of period of interest
end	string	End of period of interest
phenomena	string or null	Two character (uppercase) VTEC phenomena code.
significance	string or null	One character (uppercase) VTEC significance code.
wfo	string	3 character WFO identifier
year	integer	Year between 1986 and the current year for which the IEM database may have VTEC records.