Martin Setvák and Vesa Nietosvaara, chairs of CWG
Various new satellite products or applications, as well as satellite-related research studies require (among other) ground-truth data for their verification, namely when dealing with severe weather produced by convective storms. For these purposes, typically data from official weather station reports, hailpad networks, field campaign networks, weather radars, and data from insurance companies are being used. Though, due to the nature of deep convective storms, the most significant weather may affect rather small areas only, with a high chance of not being recorded by regular observations of professional weather stations and their networks. For this reason, data from alternate or additional sources may be needed, to increase the density of ground observations. One of such possible data sources is the European Severe Weather Database (ESWD, http://www.eswd.eu), managed by the ESSL.
Presently, only several of European national weather services (NWS) officially contribute to ESWD (http://www.essl.org/cms/european-severe-weather-database/eswd-cooperations), which makes the use of ESWD records somewhat problematic, not covering parts of Europe as needed. In order to enhance the usability and reliability of ESWD data for satellite-related studies, the chairs of the Convection Working Group wish to encourage those NWS (or any other official meteorological institutions) which do not contribute yet to the ESWD, to consider their possible collaboration with or contributions to the ESWD. More representative and comprehensive ESWD database is likely to result in more reliable satellite products, and may as well contribute to better understanding of satellite-observed storm-top processes and phenomena and their significance for nowcasting applications.
Ján Kaňák, SHMÚ
Ján Kaňák conducted consistency checks of RSS and super RSS image time sequences on the base of consultations with Johannes Mueller from EUMETSAT (STG-SWG action-35.13). The resulting full report can be found here.
The main results from this work are:
- In spite of the fact that calibration of IR 10.8 micron channel was stable during experiments, Earth’s atmosphere anisotropy influences the measured brightness temperatures of the same scene from different orbit positions (MSG1,2 and 3) in order of 1-2 K during the day. This can slightly influence some quantitative algorithms (NWCSAF, OT detections) applied to data from the same time, for the same region but from different MSG satellites.
- During RSS experiments in 2013 by MSG-1 some stronger horizontal (East-West direction) image drifts occurred in south part of imagery, which influenced overall image geometry also over central and northern regions of Europe. Because of short scan time interval (2.5min) also small image drifts can be comparable to the cloud movement and therefor can not be neglected in meteorological interpretation of some small scale features (cloud edges, OT exact positions).
- Periodic, but in average small (subpixel) image drifts were found in 2.5min RSS imagery with the period of 30 minutes, which can be neglected in meteorological interpretation.
The CWG makes available the McIdasVCast software. To install the system, we recommend that you:
1. First downlaod the Setup Guide.
2. From the guide determine which of the following packages you need, and then download that package:
The CWG received an announcement for …
The World Weather Open Science Conference
WWOSC-2014 – The weather: what’s the outlook?
Montréal, Canada, 16 to 21 August 2014
Theme: Seamless Prediction of the Earth System: from minutes to months
The Conference is structured around two programs:
• The science program will cover both the basic weather research that extends knowledge of processes and systems and the applied research needed to put prediction systems together and assess the impacts of weather and climate events.
• The user, application & social science program will consider the goods and services economy and the role of government in disaster risk reduction/management and the communication of weather information.
For more information, please visit:
Marianne has updated the Best Practices Document. The main update is the addition of Chapter 3.6, which describes the Convective initiation product developed by the Japanese Meteorological Agency that is run operationally on MTSAT data.
A new version (30 July 2012) of the “living” Best Practice document has been prepared. Please download and comment on this document, authored by John Mecikalski, Kris Bedka and Marianne König.
Please take note of the methods they describe. The intention is that this document is a “living” document and you are strongly encouraged to add sections to it, describing alternative nowcasting methods. The “Best Practice document” and your contributions will be a topic in upcoming CWG meetings.