A short demo …. VejVejr is an internetbased surveillance and forecasting system, developed by DMI and Vejdirektoratet. VejVejr provides any tools needed.

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Presentation transcript:

a short demo …. VejVejr is an internetbased surveillance and forecasting system, developed by DMI and Vejdirektoratet. VejVejr provides any tools needed to secure proper decisionmaking with regards to preventing slippery roads. Contacts: Pernille Arnsfelt Hansen DMI – Søren Brodersen DMI –

Slippery roads when: Road-temperature < 0 Rime - dewpoint is higher than road-temperature Ice – moisty or wet roads Precipitation We need to know: Road-temperature – actual and forecasted Humidity – dewpoint Precipitation Cloudcover Road condition – wet, moisty, salinity, freezingpoint etc.

Actual time or historic mode

Road T > + 2 Road T < + 2 but above 0 Road T < 0 Road T < 0 and dewpoint higher (riming)

Worst status next 5 hours

Choose your local area…

Forecasts for each roadweatherstation doubleclick!

Alarm status

Observations T 2m Road T dewpoint

Forecast Road T < 0 from hours Dewpoint is higher – this means riming (hoar frost)

Road resistance – how wet is the road ? Dry Moist Wet Salty

Forecast of precipitation – time/type/intensity Forecast of cloudcover Forecast of wind – direction/speed To 24 hour forecast

24 hour forecast Forecasted precipitation: Snow Snow and rain mixed Rain

Area-forecast

Comments from meteorologist

Online radar data – 10 min intervals Precipitationtype and intensity: Rain Rain and snow mixed Snow (or freezing rain) Animation

Online satellitedata from MSG2 – 15 min interval Cloudtype color-code: Dense clouds – Weak radiation, weak road-cooling. Scattered clouds – Periodic radiation, some road cooling. Cirrus – Thin clouds, some radiation, some road cooling. Animation Allows you to follow changes in cloudcover – to spot areas with either clear weather (and cooling/radiation) as well as clouds that provide little or no heat-insulation.

Help - explanation Online help to all screen-images

Online Web-cams

Regional text-forecast 7 days text-forecast

Observations from roadweatherstations - graphics Roadtemperature

Roadcondition

Precipitation

Salinity

Freezingpoint

Roadweather observations for your chosen area - text

Observations from specific roadweatherstation - text

Animation - your own choise of observed parameters This function allows you to follow any weather development, for instance roads cooling or precipitation spreading. All observations can be animated and color- coded as you like it…

Graphics – your own choise of visualisation

Wind forecast (for bridges mainly)

How does it work …?

INPUT: Observations, from roadweatherstation. Meteorological stations Satellite data (clouds) Atmosphere condition from HIRLAM weather model. …compute OUTPUT: Future road condition. Numeric ROAD CONDITION model

Model area and road weather station network Exclusive forecast available for each road-station.

Verification : Mean ABSOLUTE error. (Situations with road temperature between -3 and +3) Distribution of the 3- hour forecast error. Error in degrees Celcius

Thank you for your attention. If you have questions or things you would like further explained, please contact us anytime. Pernille Arnsfelt Hansen, meteorologist, Søren Brodersen, senior meteorologist,