public weather warnings at deutscher wetterdienst (dwd) · public weather warnings at deutscher...

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Public Weather Warnings at Deutscher Wetterdienst (DWD)

Klaus BähnkeDeutscher Wetterdienst, Offenbach

METEOROLOGY IN THE PUBLIC EYEThe Challenges in Meteorology 2 – scientific-professional conference

6 – 7 March 2012, Technical Museum, Zagreb, Croatia

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1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

Public Weather Warnings at DWD Public Weather Warnings at DWD

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Storm gustsStorm gusts

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Torrential rainTorrential rain

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Icy roadsIcy roads

Freezingrain

Freezingrain

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Heavy snowHeavy snow

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1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

Public Weather Warnings at DWD Public Weather Warnings at DWD

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Lead time of forecasts How many days is the forecast better than a forecast based on climate („as it is every year“)?

0 3 6 9 12

Forecast of different weather elements is varying.

Forecast of different weather elements is varying.

Days of forecast

Precipitation: yes/no 11.4

Winddirection 10.8Windgusts Bft6: yes/no 10.8

Nighttime minumum temperature 9.8

Daytime maximum temperature 8.6

Probability precipitation > 0 mm/d 8.4

Duration of sunshine 7.5

Probability of windgusts > Bft 6 7.5

Windspeed 7.0

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DWD’s Warning system

•Early warning

•Prewarning

•Warning

•Early warning

•Prewarning

•Warning

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I. Early Warning48 – 120+ h

6 – 48 h

2 – 24 h

0 – 2 h

II. Prewarning

Medium range

Short range

Very short range

Nowcasting

III. Warning / Severe Weather warning

DWD’s three-tiered warning systemDWD’s three-tiered warning system

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1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

Public Weather Warnings at DWD Public Weather Warnings at DWD

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First Technology, thereafter the ForecastFirst Technology, thereafter the Forecast

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Weather has no Frontiers

11.000 Landstations measure pressure, wind, temperature and humidity, thereof 176 in Deutschland.

900 Weatherballons 2x daily worldwide, to get a upper air profil of temperature, humidity and wind speed.

2.800 Ships do weather observations in regions

of the southern hemisphere and the oceans.

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Weather has no Frontiers

750 floating buoys and about 3.000 comercial airliners measure special weather data day by day

What is still missing?

weather satellites and radar!

What is still missing?

weather satellites and radar!

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• Satellites measure temperature of surface and in the atmosphere.

• Geostationary satellites, i.e. „METEOSAT“,circle in 35.800 km altitude.

• Looking from the earth, they stand still in the sky.

• Polar orbiting satellites circle in 800-900 km altitude over the poles.

• DWD‘s radar network of 17 radars detects even very small storm clouds.

Weather has no Frontiers

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All data get togetherWeather will be calculated in 40 vertical layers:

By a global model (GME) in triangles, side length 40 km, worldwide 368.642 grid points

By a lokal model (COSMO-EU)

in recktangles, side length 7 km, for

Europe 436.905 grid points

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All data get together

Weather models are reliable, but 100 %-forecast not possible! Weather models are reliable, but 100 %-forecast not possible!

DWD-temperature forecast for Central Europe by local model (COSMO-EU)

Forecast of wind speed by global model (GME) of DWD

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Radar-Picture

Hail storm at Leipzig

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Radar-PH-picture

with geographic layer

Hail storm at Main, 25.6.2008

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Tracking the path of Mainz stormcell

with KONRAD system

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Illustration of aFront of storm cells

with KONRAD

Berliner Unwetter, 10.7.2002

Illustration of aFront of storm cells

with KONRAD

Berliner Unwetter, 10.7.2002

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Illustration of rotating structures with doppler radar

red = Echo moves away from radarblue = Echo onto the radar

Red spot in blue area = rotation

Ra

Cell 22Mesocyklone and tornado

RotationRotation

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1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

1. Introduction

2. Warning system

3. Warning tools

4. Warning medias

Public Weather Warnings at DWD Public Weather Warnings at DWD

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Warning Medias

•Warnings on website „www.dwd.de“•Nationwide•Regional•European wide

•Warnings on website „www.dwd.de“•Nationwide•Regional•European wide

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www.meteoalarm.euwww.meteoalarm.eu

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• Single voice policy in mass medias

• Television

• Radio

• Single voice policy in mass medias

• Television

• Radio

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Media Services:

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Text reportsText reports

Standard WX-Reports for Germany

Standard WX-Reports for Germany

Top story of the dayTop story of the day

Newsletter „Deutschland aktuell“

Newsletter „Deutschland aktuell“

Media information In case of severe wxMedia information

In case of severe wx

Statement on Facebook.de/DWD

Statement on Facebook.de/DWD

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Media Services:

Oral statementsOral statements

Media requestsMedia requests

InterviewsInterviews

Support of DWD PR department

Support of DWD PR department

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Media Services:

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Text reportsText reports

Standard WX-Reports for Germany

Standard WX-Reports for Germany

Top story of the dayTop story of the day

Newsletter „Deutschland aktuell“

Newsletter „Deutschland aktuell“

Media information In case of severe wxMedia information

In case of severe wx

Statement on Facebook.de/DWD

Statement on Facebook.de/DWD

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Media Services:

Oral statementsOral statements

Media requestsMedia requests

InterviewsInterviews

Support of DWD PR department

Support of DWD PR department

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Puno hvala (Thank You)

Merlo/Argentina14. Nov 2009

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The End

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DWD-HeadquartersOffenbach am Main

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DWD-HeadquartersOffenbach am Main

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Central Forecasting OfficeOffenbach am Main

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Central Forecasting OfficeOffenbach am Main

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Central Forecasting OfficeOffenbach am Main

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