Chair Report
Chair Report
Chair Report
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Appendix 2<br />
RECOMMENDATIONS ON FORECASTERS’ REQUIREMENTS<br />
It has been obvious that weather forecasters were enthusiastic in contributing in this<br />
COST project. We had 102 questionnaires filled.<br />
Three priority areas were determined: 1) Model related requirements, 2) Requirements on<br />
observations and measurements, 3) Climatological requirements.<br />
1) MODELS<br />
(i) More useful products are required from the models regarding visibility<br />
and low cloud. There are requirements for presentations in terms of cross<br />
sections and finer vertical resolution maps. Also, forecasters require that<br />
they have diagnostic fields (e.g. visibility, low cloud base, low cloud tops,<br />
low cloud amount, low cloud phase e.g. freezing conditions).<br />
(ii) Improved model performance is another requirement put forward by<br />
forecasters. In particular forecasters are interested in improving the<br />
performance of boundary layer models. They also require that boundary<br />
layer models have higher vertical resolution.<br />
2) OBSERVATIONS AND MEASUREMENTS<br />
With regard to existing observations forecasters require:<br />
(i) Higher density and more frequent observation to be available (both<br />
spatially and temporary).<br />
(ii) SYNOP, METAR, TEMP and satellite information to become more<br />
frequently updated.<br />
With regard to additional observations forecasters require:<br />
(i) Observations from video cameras, profilers, satellite with “fog channel”,<br />
satellite with higher resolution imagery, ceilometers, cloud radar, additional<br />
visibility measurements, net radiation.<br />
(ii) The frequency with which these additional observations would be<br />
provided ranges from 0 to 15 minutes.<br />
More issues are related to:<br />
(i) Better information is required by the forecasters in understanding these<br />
observations (especially on new platforms) , on the one hand, and in the<br />
forecasting methods that make use of them, on the other hand. The latter is<br />
related to a requirement for better understanding on the capabilities of<br />
models used.<br />
(ii) More automatic weather stations reporting humidity and temperature.<br />
(iii) There is a particular requirement for more observations over the sea.<br />
(iv) Improve the exchange of information between different states: more<br />
information but also more quickly.<br />
3) CLIMATOLOGICAL REQUIREMENTS<br />
(i) Not enough sites have climatological information. More climatological<br />
information is required and in particular information is need for more sites.<br />
(ii) The information may be available but access to it is not easy, so there is<br />
a demand that, if the climatological information is available, to be presented<br />
to the forecasters.