Multi-Radar Multi-Sensor Products
The Multi-Radar Multi-Sensor (MRMS) system developed by NOAA's National Severe Storms Laboratory (NSSL) and the University of Oklahoma's Cooperative Institute for for Severe and High-Impact Weather Research (CIWRO), and operated by the National Centers for Envirionmental Prediction (NCEP). MRMS combines data from multiple radars into a single suite of products covering the United States. By combining data from multiple radars, MRMS provides an overview of weather across the country and offers derived products that aren't available with single-site radar data.
Reflectivity at Lowest Altitude
Reflectivity at Lowest Altitude shows data at the lowest detectable altitude from all available radars, similar to what you'd see if you displayed the single-site tilt 1 reflectivity from every radar at once. Where radar coverage areas overlap, the lowest-altitude data is used.
Typed Reflectivity at Lowest Altitude
Typed Reflectivity at Lowest Altitude shows data at the lowest detectable altitude from all available radars with a precip type mask applied, similar to what you'd see if you displayed the single-site precipitation depiction from every radar at once. Where radar coverage areas overlap, the lowest-altitude data is used.
Composite Reflectivity
Composite reflectivity combines data from all elevation scans, or tilts, to create a single product. The resulting image shows the highest reflectivity value from the vertical cross section at that location. Composite reflectivity can reveal important features in a storm’s structure that might not be seen in the base reflectivity product.
Hybrid-Scan Reflectivity
This product provides quality-controlled reflectivity at the lowest possible altitude.
Precipitation Rate
This product provides an estimate of the precipitation rate.
Radar-Only Precipitation Accumulation (One-Hour)
This product provides an estimate of precipitation accumulation based on the surface precipitation rate over a one-hour period.
Maximum Estimated Size of Hail
This product provides an estimate of the current maximum hail size.
Maximum Estimated Size of Hail (One-Hour)
This product provides an estimate of the maximum hail size over the past hour.
Azimuthal Shear
Azimuthal Shear highlights circulations and horizontal shear in the low altitudes of storms that may be associated with mesocyclones or torandoes.
Learn More
You can learn more about MRMS products here: