Navigation Links

 

Products Guide

QPE - Radar Only

QPE - Radar Only

Short Description

Precipitation accumulations derived from the summation of the Surface Precipitation Rate (SPR) product over a specified time interval.

Subproducts

  • 1-, 3-, 6-, 12-, 24-, 48-, and 72-hour accumulations

Primary Users

NWS: WFO, RFC

Input Sources

Surface Precipitation Rate

Resolution

Spatial resolution: 1km x 1km

Temporal resolution: The 1-hour accumulation field is updated every 2 minutes. The 3-, 6-, 12-, and 24-hourly accumulations are updated hourly at the top of the hour. 48- and 72-hour accumulations are updated daily at 12Z. All products end at the indicated time.

Product Creation

The one-hour QPE – Radar Only product is an aggregation of the Surface Precipitation Rate (SPR) field, which is updated every 2 minutes. The SPR fields from the previous 60 minutes are summed to create the QPE – Radar Only field, with the product ending at the indicated time. For instance, a QPE – Radar Only field that is valid at 15:04Z is a summation of SPR fields from 14:04Z, 14:06Z, 14:08Z …to 15:04Z. Values at or below 0.01 inches are removed to reduce the areal coverage of what is most likely false light precipitation. A physically-based solution (e.g. something that takes into account factors like near-surface evaporation) is currently under development.

Longer accumulations (3-, 6-, 12-, 24-hourly) are summations of the one-hour fields, updated at the top of the hour. The 48- and 72-hour accumulations are summations of the 24-hour fields, updated daily at 12Z.

Technical Details

References

Zhang, J., K. Howard, S. Vasiloff, C. Langston, B. Kaney, Y. Qi, L. Tang, H. Grams, D. Kitzmiller, J. Levit, 2014: Initial Operating Capabilities of Quantitative Precipitation Estimation in the Multi-Radar Multi-Sensor System. 28th Conf. on Hydrology, Amer. Meteor. Soc.

Other MRMS product documentation: Surface Precipitation Rate