New sites typically appear in your portal within 24–48 hours after installation and activation. If it’s been longer, please contact support.

See our alerts how-to page here.

See our USGS how-to page here.

You can download data in CSV, PNG, PPTX, or PDF format from the site’s page. Look for the download icon in the upper right corner.

Our rainfall data is sourced from partner agencies that maintain high-resolution precipitation datasets, primarily from the National Weather Service’s Multi-Radar Multi-Sensor (MRMS) product. This grid-based dataset is updated in real-time and combines ground-based rain stations with radar observations for high-accuracy rainfall. The reported rainfall within the nearest 0.6 mile x 0.6 mile grid cell is automatically included alongside Hyfi sensor data.

Hyfi sensors use ultrasonic technology similar to echolocation to measure the distance from the sensor to the surface below. When snow or ice accumulates directly beneath the sensor, it becomes the surface the sensor “sees”, as if one were reading at a stream gage. During winter months, it’s normal for readings to show ice or snow accumulation.

In some instances, ice or debris may result in an uneven surface and scatter the sensor’s signal. This may temporarily prevent accurate measurements and lead to short data gaps. Once ice melts or debris clears, the sensor will automatically resume normal operation.

Sites such as detention basins, storm channels, and ephemeral waterways often remain dry except during rain events. When these areas are dry and levels are low, the sensor may not detect water within its measurement range, or the ultrasonic signal may reflect unpredictably off the exposed surface below. This is expected behavior and can result in temporary data gaps.

Data will resume automatically when water flows through the site during storms or wet weather periods.