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QPE-to-FFG Ratio

QPE-to-FFG Ratio

Short Description

Analogous to the ratio provided in FFMP, this is the ratio of the current MRMS Radar-Only QPE value at each grid point to the current nationally-mosaicked FFG value for the same grid point.


Available for rainfall durations of 1-, 3-, and 6-hours.  A maximum product exists which finds the maximum ratio across all accumulation durations.

Primary Users


Input Sources

MRMS Radar-Only QPE, and Nationally-Mosaicked FFG


Spatial:  ~1 km x 1 km

Temporal:  2 minutes (Keep in mind FFG only updated every 6 hours)

Product Creation

The FLASH system takes the MRMS Radar-Only QPE value for the defined accumulation periods (1-, 3-, and 6-hours) and compares those gridded values to the corresponding nationally-mosaicked FFG gridded values. 

Technical Details

Latest Update: MRMS Version 12

NOTE: In version 12, all FLASH products now use the instantaneous rainfall rates from the Dual-pol radar synthetic QPE product.

Accessible on:

  1. Operational AWIPS
    1. V11.5 -- MRMS menu
    2. V12 -- via LDM, if set-up
  2. MRMS Development site


Gourley, J., Z. Flamig, H. Vergara, P. Kirstetter, R. Clark III, E. Argyle, A. Arthur, S. Martinaitis, G. Terti, J. Erlingis, Y. Hong, and K. Howard, 2016: The Flooded Locations And Simulated Hydrographs (FLASH) project: improving the tools for flash flood monitoring and prediction across the United States. Bull. Amer. Meteor. Soc. doi:10.1175/BAMS-D-15-00247.1, in press.