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Steve Davis Meteorologist Senior Forecaster National Weather Service

Steve Davis Meteorologist Senior Forecaster National Weather Service. National Weather Service Forecast Office Milwaukee/Sullivan, WI. Watch/Warning responsibility For 20 counties in southeast and south central Wisconsin. My First Job (1986)!. Cold Bay, AK. Cold Bay, Alaska!.

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Steve Davis Meteorologist Senior Forecaster National Weather Service

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  1. Steve Davis Meteorologist Senior Forecaster National Weather Service

  2. National Weather Service Forecast OfficeMilwaukee/Sullivan, WI Watch/Warning responsibility For 20 counties in southeast and south central Wisconsin.

  3. My First Job (1986)! Cold Bay, AK

  4. Cold Bay, Alaska!

  5. Who Are We? • Federal Government Agency • The National Weather Service has about 121 Weather Forecast Offices across the country. • Offices are staffed 24 hours a day, 7 days a week, 365 days a year. • Forecasters work rotating shifts to cover all hours of the day and night.

  6. Our Duties Aviation! Fire!! Public Forecasts Warning Operations Marine Forecast For Lake Michigan

  7. Inside Our Office Tornado & Severe Thunderstorm Warnings Issued here!

  8. Remember Those Layers? This is where it all happens!

  9. Mother Nature Is Showing Us The Tropopause! Any Guesses? Tropopause 100 MPH Or More!

  10. Aurora, Nebraska June 22, 2003 7 Inches In Diameter!! When, where and how big was the largest hailstone found in the United States?

  11. Thunderstorm Examples

  12. The Sun! How Does The Weather Work? What causes the weather on planet earth? The sun heats the equatorial region more than the poles. The land and water heat (and cool) at different rates. Then throw in a spinning earth and all this leads to turbulent motions in the atmosphere.

  13. So, How Do We ForecastThe Weather? • First, we have to measure it. • Then we plug these measurements into complex computer models, or simulations. • We interpret these simulations and put together the best forecast possible. Forecaster experience very important.

  14. Different Ways We Measure The Atmosphere Upper Air Radar Surface Satellites Airplanes

  15. Sea surface temperatures measured from satellites. See how the equator is warmer than the polar regions? What kind of big storms develop when the ocean gets really warm?

  16. Weather Balloon Release

  17. Atmosphere Reduced To Complex Mathematical Equations

  18. Supercomputers Simulate The Weather • They can perform 69 trillion calculations per second! • How long would it take you to count to a billion? • It can count to 1 billion, 69,000 times every second!!!

  19. Viewing Model Output Air Pressure Temperatures Satellite Imagery Precipitation Vorticity (Spin)

  20. Pulling It All Together The Meteorologist will take all of this new information and put it into a Graphical Forecast Editor, creating a graphical representation of the forecast. All 121 offices across the country will do this for their area. These are all merged into one big picture.

  21. There’s No Place LikeThe UnitedStates For Weather!Why?

  22. Cool and Moist Cold and Dry Cool and Moist Frontal Boundary Warm and Moist Warm and Moist Air Masses: large volumes of air having a similar temperature, atmospheric pressure, and moisture content. Air masses cover many hundreds or thousands of square miles, and slowly change in accordance with the terrain they are over.

  23. H Cool and Moist L Warm and Moist A Low pressure system will bring air massestogether. The contrast of different air masses can cause all kinds of weather.

  24. Thunderstorms develop along cold fronts. This picture shows us where the heaviest rain is. This tells us little about the strength of the wind!

  25. Doppler Radar!!

  26. Big Wind!!

  27. Where Is The Tornado?

  28. This one is called Pyrocumulus

  29. This is Cumulonimbus Mammatus

  30. The Best Of All: Cumulonimbus

  31. How Lightning Works Rule Of Thumb Sound travels about 1 mile in 5 seconds. If you see lightning, you can estimate how far away it is by counting how long it takes the thunder to reach your ears. Flash – Bang: The lightning is too close! 2 seconds: Less than ½ mile away 5 seconds: 1 mile away 10 seconds: 2 miles away 15 seconds: 3 miles away The thunderstorm creates an imbalance between positive and negative electrons. The air is a good insulator…allowing the opposing charges to build. When a tall object comes in between the ground and the storm, the charges are “encouraged” to jump toward each other.

  32. So, you want to be a Meteorologist! You have to like (maybe love) math! You have to take a lot of science classes. You have to have good writing skills. You have to go to college for at least 4 years. Usually more. You will use lots of computers. You can work on TV. You can work for the National Weather Service. You can work for companies that are affected by weather. For example – Chocolate Company Utility Companies Airlines

  33. Any questions?

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