Hydrological Markup Language Processed Data Download

The IEM attempts a high-fidelity processing and archival of river gauge observations and forecasts found within NWS HML products.

The HML archive dates back to 2012.

Download results open in a new tab. Forecast requests are limited to a single UTC year at a time.

1. Select Station(s)

Choose one or more stations from the HML network for download.

2. Select Data Type

Observations

Forecasts

3. Timezone of Observations

Timestamps in the downloaded file will be converted to the timezone you select.

4. Select Start and End Time

The start date is inclusive. The end date is not inclusive.

	Year	Month	Day
Start
End

5. Data Format

Name	Description
station	5 character station identifier
valid[timezone]	Timestamp of observation
`Label for Values`	Primary
`Label for Values`	Secondary

Name	Description
station	5 character station identifier
issued[timezone]	Timestamp of forecast issuance
primaryname	Label for the primary forecast value
primaryunits	Units for the primary forecast value
secondaryname	Label for the secondary forecast value
secondaryunits	Units for the secondary forecast value
forecast_valid[timezone]	Timestamp of forecast valid
primary_value	Primary forecast value
secondary_value	Secondary forecast value