Identification of hail cases in the HBT area using Vaisala's

HydroClass ™ -product

Reino Keränen

Jari Tuovinen

Tuomo Bergman

Janne Ylläsjärvi

Motivation

• Test HydroClass™-product in two different hail/graupel-cases.

• Learn to use HTB-data

Research methods

• Case selection from eye-witness reports.

• Comparision of HydroClass™ data with other Vaisala/HY dual-pol. radar data.

• Resolving Synoptic situation (NCEP-reanalysis, SYNOP/testbed-surface mesourements).

• Effort to find hail observations on WXT510-station data.

Sample data15.05.2006

5 cm layer of graupel in Paippinen

HydroClass

Reflectivity

Sample data

What we hope to learn?

• HydroClass ™ capabilities to detect hail/graupel in varying conditions.

• WXT510-station possibilities to detect hail/graupel.