IEM :: JSON(P) Web Services

IEM Provided JSON-P Webservices

This page is an attempt to document the various JSON-P web services the IEM uses to drive its various applications. These services are provided without warranty and may be disabled without warning if "bad things happen". We do try our best to keep them running, so please Contact Us if you have difficulties.

These services support JSONP, which is a technique that allows the deliver of data from a cross-domain origin. The technique involves placing or injecting <script> tags into your webpage and specifying a javascript function to callback. For example,

 <script type="text/javascript">
  function gotData(data){
     console.log(data);
  }
 </script>
 <script type="text/javascript"
         src="https://mesonet.agron.iastate.edu/json/example.json?callback=gotData">

This <script> tag above that requests data from this server will return javascript that looks like:

 gotData({"Name": "daryl", "Profession": "nerd", "Age": 99});

These services are generally legacy with more modern services being provided in our API.

Okay, so you are all set for documentation on what services are available!

United States Drought Monitor

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/geojson/usdm.py?date={date}&callback=gotData
Description: The US Drought Monitor valid for the given date. You do not need to specify the exact date on which the Drought Monitor was issued. The service will compute the date on which the Drought Monitor was issued given the provided date. Not specifying a date will provide the current Drought Monitor. Archive begins on Jan 2000.
Method GET Parameters:

date	Date (optional)

Single Station Last Observation

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/current.py?station={station}&network={network}&callback=gotData
Description: The most recent observation for an IEM tracked site.
Method GET Parameters:

station	Station Identifier
network	Network Identifier

Oregon State PRISM Grid Cell Daily Sample

This service has a dedicated help page, click here.

NCEP Stage IV Hourly Precipitation

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/stage4/{lon}/{lat}/{utc_date}?callback=gotData
Description: This service provides a grid point sampling of the NCEP Stage IV product. The date provided the service is a UTC date. Note that the hourly stage IV data does not receive the level of QC that the 6, 12, and 24 hour summaries do.
Method GET Parameters:

lat	Latitude (deg N)
lon	Longitude (deg E)
utc_date	YYYY-mm-dd

Local Storm Reports for One Storm Based Warning

This service has a dedicated help page, click here.

Local Storm Reports for a given period

This service has a dedicated help page, click here.

Archived or Current NEXRAD Storm Attribute Table

This service has a dedicated help page, click here.

IEM Tracked Networks Metadata

This service has a dedicated help page, click here.

NWS Impact Based Warnings Tags

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/ibw_tags.py?year={year}&wfo={wfo}&callback=gotData
Description: Produces a listing of Impact Warning Tags used in Severe Thunderstorm, Tornado, Marine, and Flash Flood Warnings warnings by NWS Forecast Office and Year.
Method GET Parameters:

wfo	3 character NWS Office
year	Year of interest

Iowa Winter Road Conditions

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/geojson/winter_roads.geojson?callback=gotData
Description: This service provides the most recent Iowa Winter Road Conditions.
Method GET Parameters:

NWS COOP Station Climatology

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/json/climodat_stclimo.py?station={station}&syear={syear}&eyear={eyear}&callback=gotData

Description: Produces a listing of daily climatology for an IEM tracked long term climodat site in the midwestern US.
Method GET Parameters:

station	6 character station identifier
syear	Inclusive start year of the period of interest
eyear	Exclusive end year of the period of interest

NWS COOP Network Climatology for one day

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/geojson/climodat_dayclimo.py?network={network}&day={day}&month={month}&syear={syear}&eyear={eyear}&callback=gotData

Description: Produces a listing of climatology for a single state for a single day.
Method GET Parameters:

network	state network identifier
month	Numeric month of interest (1-12)
day	Numeric day of interest (1-31)
syear	Inclusive start year of the period of interest
eyear	Exclusive end year of the period of interest

NWS VTEC Maximum Event ID by Year

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/vtec_max_etn.py?year={year}&callback=gotData
Description: Produces a listing of the maximum eventid used for each NWS Forecast Office, VTEC Phenomena and VTEC Significance.
Method GET Parameters:

year	YYYY year

NWS VTEC Event Geometries

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/geojson/vtec_event.py?wfo={wfo}&year={year}&phenomena={phenomena}&etn={etn}&significance={significance}&callback=gotData

Description: Produces GeoJSON for a given VTEC Event.
Method GET Parameters:

wfo	3 or 4 character WFO identifier
year	YYYY year
etn	VTEC Event ID
phenomena	2 Character VTEC Phenomena Code
significance	1 Character VTEC Significance Code
sbw	1 or 0, flag to return Storm Based Polygon(1) or Counties
lsrs	1 or 0, flag to return local storm reports

NWS VTEC Event Metadata

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/json/vtec_event.py?wfo={wfo}&year={year}&phenomena={phenomena}&etn={etn}&significance={significance}&callback=gotData

Description: Produces metadata on a given VTEC Event.
Method GET Parameters:

wfo	3 or 4 character WFO identifier
year	YYYY year
etn	VTEC Event ID
phenomena	2 Character VTEC Phenomena Code
significance	1 Character VTEC Significance Code

NWS VTEC Event Listing by WFO by Year

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/vtec_events.py?wfo={wfo}&year={year}&callback=gotData
Description: Produces a listing of VTEC Events (watch, warning,advisories) by year by weather forecast office. You can optionally pass a phenomena=XX and significance=X to the service to only return that VTEC event type for the given WFO and year. Additionally, there is a one-off feature flag of combo=1, which has the service return and Tornado, Severe Thunderstorm, and Flash Flood Watches/Warnings in chronological order.
Method GET Parameters:

wfo	3 character WFO identifier
year	YYYY year

NWS VTEC Event Listing by State by Year

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/vtec_events_bystate.py?state={state}&year={year}&callback=gotData
Description: Produces a listing of VTEC Events (watch, warning, advisories) by year by state.
Method GET Parameters:

state	2 character State identifier
year	YYYY year

NWS VTEC Event Listing by WFO valid during Given Period

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/vtec_events_bywfo.py?wfo={wfo}&start={start}&end={end}&callback=gotData
Description: Produces a listing of VTEC Events (watch, warning, advisories) by wfo with UGC information enumerated.
Method GET Parameters:

wfo	3 character WFO identifier
start	ISO Start Datetime UTC (YYYY-MM-DDTHH:MM)
end	ISO End Datetime UTC (YYYY-MM-DDTHH:MM)

NWS Text Products by AWIPS ID and Time Period

This service has a dedicated help page, click here.

Daily NWS Climate (CLI Product) Summaries

This service has a dedicated help page, click here.

Yearly NWS Climate (CLI Product) Summaries for One Station

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/cli.py?station={station}&year={year}&fmt={fmt}&callback=gotData
Description: Provides a JSON response summarizing all of the atomic processed data from the NWS issued CLI reports for a single station and given year. You can optionally set fmt=csv to get a CSV response.
Method GET Parameters:

year	YYYY desired
station	ICAO 4-character station identifier
fmt	Return format (optional) json (default) or csv

IEM Tile Map Service Metadata

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/tms.json?callback=gotData
Description: Provides metadata about the currently available Tile Map Services provided by the IEM. This is useful to determine how to call back to the Tile Map Services.
Method GET Parameters:

Current Storm Based Warnings

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/geojson/sbw.geojson?ts={ts}&callback=gotData
Description: Provides a geojson format of current National Weather Service storm based warnings. There is a 15 second caching done by the server to ease load. The generation_time attribute is set on the output to diagnose when the file is valid. You can provide a timestamp to provide archived warnings back to 2002 or so. The polygons returned are the actualy ones valid at the given timestamp or realtime, so any polygon updates done with warning event are included here. There should only be one polygon per warning event. You can optionally pass a wfo=WFO3Char to limit the polygons to a single office.
Method GET Parameters:

ts	ISO-8601 Timestamp YYYY-mm-ddTHH:MI:SSZ (optional)

Storm Based Warnings Issued Between Interval

This service has a dedicated help page, click here.

Search for Storm Based Warnings by Lat/Lon Point and Time

This service has a dedicated help page, click here.

Search for VTEC Events by Lat/Lon Point

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/json/vtec_events_bypoint.py?lon={longitude}&lat={latitude}&sdate={sdate}&edate={edate}&callback=gotData

Description: Provides a listing of VTEC events that were valid for a given latitude and longitude point.
Method GET Parameters:

lat	Latitude in degrees
lon	Longitude in (degrees east)
sdate	YYYY-mm-dd Start Date (UTC)
edate	YYYY-mm-dd End Date (UTC)
fmt	(optional) Format to download as: json (default) or xlsx

Storm Prediction Center Mesoscale Convection Discussions by Lat/Lon Point

This service has a dedicated help page, click here.

Storm Prediction Center Convective Outlooks by Lat/Lon Point

This service has a dedicated help page, click here.

Storm Prediction Center Convective Outlooks by Size

This service has a dedicated help page, click here.

Storm Prediction Center Convective Outlooks by Lat/Lon Point by Time

This service has a dedicated help page, click here.

Special Weather Statements (SPS) Polygons in GeoJSON Format

This service has a dedicated help page, click here.

Special Weather Statements (SPS) Polygons Query by Point

This service has a dedicated help page, click here.

Search for Warnings by UGC Code and Date Interval

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/json/vtec_events_byugc.py?ugc={ugc}&edate={edate}&sdate={sdate}&callback=gotData
Description: Provides a json response of archived warnings valid for the given UGC code and date interval (UTC time, end date exclusive). The date of product issuance is used for the date filtering.
Method GET Parameters:

ugc	Five character UGC identifier used by the NWS
sdate	YYYY-mm-dd Start Date (UTC)
edate	YYYY-mm-dd End Date (UTC)
fmt	(optional) Format to download as: json (default) or xlsx

Storm Prediction Center Watches by Time

This service has a dedicated help page, click here.

Storm Prediction Center Watches by Point

This service has a dedicated help page, click here.

RAOB Soundings

This service has a dedicated help page, click here.

SHEF Station Variables

This service has a dedicated help page, click here.

Data Collection Network Details

Example JSON Example JSONP
URI Pattern:https://mesonet.agron.iastate.edu/geojson/network.py?network={network}&callback=gotData
Description: The IEM bunches observation stations into networks. This service provides metadata for sites within a network. A listing of networks can be found on this page.
Method GET Parameters:

network	IEM Network Identifier

IEM Archived Data Products

This service has a dedicated help page, click here.

GOES East/West Available Scans

Example JSON Example JSONP
URI Pattern:

https://mesonet.agron.iastate.edu/json/goes.py?operation=list&start={start}&end={end}&bird={bird}&product={product}&callback=gotData

Description: This service returns a listing of available GOES scan times for a period of time. This service will default to the past four hours worth of data when start and end times are not specified.
Method GET Parameters:

operation	Currently always 'list'
start	ISO-8601 UTC Timestamp (optional)
end	ISO-8601 UTC Timestamp (optional)
bird	GOES EAST or GOES WEST
product	GOES Channel IR, VIS, or WV

product_id	String that uniquely (not fully) indentifies a text product.

IEM Tracked Station Metadata Changes

This service has a dedicated help page, click here.

IEM Webcam Availability

This service has a dedicated help page, click here.

That is all for now. Enjoy!