As of February 1, 2010, the weather alarm new style introduced by the KNMI. The weather alert is regionally determined and the criteria that must be met to issue a weather warning are stricter. Incidentally, the KNMI remains the only authority which can declare a weather alert.
These adjustments of the weather alerts were established in consultation with the Secretary of State for Transport. The reason was partly the criticism that was given in 2009 by repeatedly issuing a weather alert by KNMI, because it was not good enough clear where and when the weather alarm was applied, making the weather warning was also seen as unnecessary. Here you can read more about all changes to the weather alarm as applicable from February 1, 2010, whereby we focus on the road.
KNMI, the Royal Dutch Meteorological Institute, uses several stages to indicate what level of attention goes to the expected weather conditions. In terms of weather conditions must be considered here include freezing rain, thunderstorms, severe rainfall, fog, snow, strong winds and tornadoes. The alert phases are:
Warning for severe weather.
Warning for extreme weather.
Some criteria to issue weather alerts are now:
The weather alert is issued per region or province.
When the KNMI weather alerts will give off, this only can only be issued up to 12 hours in advance, if at least 90% certain that the expected extreme weather conditions will occur. As a warning prior to a weather alert, you can 24 hours before the extreme weather is expected or already issue a warning for extreme weather, provided there is 60% certainty about the effects of extreme weather. From 48 hours prior to the expected extreme weather can be 60% sure if this is, issue a warning for severe weather.
In addition, KNMI will be when there is a weather warning information and progress must update at least every hour. Always necessary to define the precise weather conditions and any damage or consequences may occur due to the extreme weather.
The only institution authorized to issue a weather warning remains KNMI, but after consultation with other bodies such as ANWB, Rijkswaterstaat, police and other meteorological institutes. This allows the KNMI can also bring aspects outside weather when deciding to issue a weather warning, as the traffic on the road. The KNMI also ultimately decides on whether or not to issue a weather warning.
Apart from changes concerning the criteria when a weather alert is issued is also KNMIaangepast website. Each province is this clearly shows the expected weather conditions. The weather situation is shown with colors ranging from green if there are no warnings to red when there is a weather warning.
When the KNMI proceeds to issue a severe weather warning, this is available on the website of the KNMI. You could also consult this Teletext page 713 and it NOS Teletext. On page 710 of Teletext hyperlink can find warnings for shipping. One can also subscribe to an SMS service, SMS weather service which one can be informed about extreme weather.