“24 hours in the life of a weather radar network”

OverreportNo echo

Underreport

underreport

Underreport

No echo

Overreport

Overreport

Overreport

Underreport

Problem: The Environment

Segmenting the DQ Adjustment Algorithms

Wind TurbinesRLAN

RV dilemmaNoise

Conversion to “P”

Data correction

ZDR calibration

Ant pol errors;

Noise processing

Orographic enhancement

Recursive issues!

The Steps• Assume radar is electronically calibrated, elevation pointing angle is good

(<0.1o)!• Static/ground clutter correction• Target identification – eg biological, precip• Problem identification – attenuation, partial beam blocking, radome wetting• Problem correction• Precipitation Echo identification (C vs S)• VPR computation• Data selection• VPR correction• Z-R bias “calibration” – see Isztar’s technique• Z-R or Z-S• Z-R for convective or stratiform• Network data merging• Space-time advection• Products for hydrology etc

Elevation Pointing Errors

Good Bad

Almost A Perfect Radar!

Michelson, SMHI

Accumulation – a winter season log (Raingauge-Radar Difference)

No blockageRings of decreasing value

Difference increases range!

almost

1O

0.65O

55 day accumulation

SensitivityMDS

Vertical Profiles of Reflectivity

1. Beam smooths the data AND2. Overshoots the weather

Explains increasing radar-raingauge difference with range

Joss-Waldvogel

No correction VPR correction

FMI, Koistinen