Risk of hail - Jabbeke weather radar

Hail products are derived from the observed vertical profiles of radar reflectivity and the NWP vertical profiles of temperature. Three types of products are generated. poh : probability of hail of any size (larger than 0.5 cm diameter)expressed in %. posh : probability of severe hail(larger than 2cm)expressed in %. mesh : maximum expected size of hailexpressed in mm of hailstone diameter. All products are generated every 5 minutes. This product is not publically available yet.

Date (Revision): 2025-10-07

Identifier: RMI-be / jabbeke_hail

Status: On going

Point of contact

Royal Meteorological Institute of Belgium

Owner

Royal Meteorological Institute of Belgium

Maintenance and update frequency: Continual

GEMET - INSPIRE themes, version 1.0

Atmospheric conditions

Keywords

federal government
hail
observation

Spatial scope

National

Access constraints: Other restrictions

Other constraints: No limitations on public access

Use constraints: Other restrictions

Other constraints: Creative Commons Attribution 4.0 International (CC BY 4.0) This is a human-readable summary of (and not a substitute for) the license. You are free to: Share — copy and redistribute the material in any medium or format Adapt — remix, transform, and build upon the material for any purpose, even commercially. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Classification: Unclassified

Spatial representation type: Grid

Distance: 500 http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources /uom/ML_gmxUom.xml#m

Metadata language: English

Topic category

Climatology, meteorology, atmosphere

Begin date: 2016-04-01T00:00:00

Unique resource identifier: EPSG:4258

Distribution format

HDF ( 5 )

OnLine resource: RMI open data portal ( WWW:LINK-1.0-http--link )
RMI open data portal

Hierarchy level: Dataset

Other: dataset

Domain consistency

Name of measure: INSPIRE Conformity

Conformance result

Date (Publication): 2010-12-08

Explanation: See the referenced specification

Pass: No

Statement: Hail detection module is an implementation of two hail detection algorithms: of Witt and of Waldvogel (Waldvogelet al., 1979). The module takes radar observations and temperature information and estimates probability of hail (POH, %), probability of severe hail (POSH, %) and maximum expected size of hail (MESH, mm). The implementation of the Waldvogel algorithm is based on the Holleman's equation (I. Holleman, 2001), which was verified for Belgium by Delobbe et al. (2003). The POH is derived in the algorithm from the presence of a substantial updraft detected above the freezing level (0º-isoterm). The implementation of the Witt algorithm is based on the weighted integration of the reflectivity values between the heights of 0º-isoterm and -20º-isotherm (Witt et al., 1998). This algorithm provides POSH and MESH estimates.