BOIVerify Introducing GridBased Verification to the NWS Ken

BOIVerify Introducing Grid-Based Verification to the NWS Ken Pomeroy Tim Barker RFC Verification Workshop, 08/15/2007 1

BOIVerify Marketing Slogan “Dragging the NWS kicking and screaming into grid-based verification since 2005” 2

Grid-based Verification 2007 Grid-based Verification 20 XX 3

What it does n Archives data • Capacity has been provided for 200 days worth of data in WR n Provides an interface for analysis • Raw data • MAE, bias • Threshold stats 4

Four verification options Select a parameter Select model(s) Select day(s) and model run(s) 5

Grid Stats 6

Distributions - Histogram 7

Distributions – Scatter Plot 8

Time Series 9

The Present… n n n BOIVerify can currently verify Temp, RH, and Wind Allows us to move from point-based to grid-based verification Dependent on Match. Obs. All analysis • Requires QC’ing of obs using QCobs application developed by Larry Greiss (SOO, Hanford) 10

The Future! n Will verify QPF and Po. P • High impact verification • Not just errors, but types of errors: timing, location, magnitude n Use of RTMA for analysis • Advantage: no need to manually QC observations 11

Verification n n It’s not a bad word!! Not comparing office to office, or forecaster to forecaster Want to know how we can improve, not dwell on how we did Use data to improve the forecast process 12

For More Information http: //ww 2. wrh. noaa. gov/ssd/digital_services/ 13