21. Companies are now talking of wind fields , like oil reserves or coal reserves, waiting to be tapped. 22. They found that changes in potential vorticity at the tropopause can cause changes in the wind field . 23. Iniki's large wind field caused nearly 30, 000 people to evacuate to 110 public shelters in Oahu. 24. Complicating factors included daytime heating and a strong wind field favorable to the creation of circulating thunderstorms. 25. Scatterometers are of high value for operational meteorology, allowing reconstruction of wind fields on a global scale. 26. The most common sources of errors in wave model results are the errors in the wind field . 27. The GIS system can display NPP s measuring stations and weather conditions like precipitation and wind fields . 28. A doppler lidar system was used in the 2008 Summer Olympics to measure wind fields during the yacht competition. 29. The islands are well known for the environmental diversity that occurs on high mountains within a trade winds field . 30. A strong, deep layer wind field prevented a number of tornadoes from forming but instead caused widespread wind damage.