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

1
Identification of hail cases in the HBT area
using Vaisala's HydroClass -product

• Reino Keränen
• Jari Tuovinen
• Tuomo Bergman
• Janne Ylläsjärvi

2
Motivation

• Test HydroClass-product in two different
  hail/graupel-cases.
• Learn to use HTB-data

3
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.

4
Sample data
15.05.2006 5 cm layer of graupel in Paippinen
Reflectivity
HydroClass
5
Sample data
6
What we hope to learn?

• HydroClass capabilities to detect hail/graupel
  in varying conditions.
• WXT510-station possibilities to detect
  hail/graupel.