ANSWERS TO REVIEW QUESTIONS

A23. The surface observation should be compared to the surface data from the radiosonde as a prelaunch check. A24. A pressure increase or failure of the pressure to decrease, or long periods of missing data. A25. The "LIST" program. A26. The level was selected us significant due to changes in the relative humidity. A27. To ensure an accurate representation of the vertical profile of the atmosphere at the time of the sounding. A28. A wind direction change of 10 degrees or more provided the wind speed is greater than 10 knots. A29. U.S. Navy ships A30. RI indicates refractive index values (N-units) and MRI indicates modified refractive index values (M-units). A31. The 101 -indicator groups are used to report additive data such as the reason for termination, corrected data, and sections of doubtful data. A32. To conduct low-level wind observations used for tactical fixed-wing and rotary aircraft operations, and paradrop operations. A33. A theodolite. A34. From the change in the horizontal position of the balloon, and then computed either manually by using a Winds Aloft Computation sheet and aplotting board, or automatically by using a calculator or computer program. A35. The Federal Meteorological Handbook (FMH-3). A36. Geophysics Fleet Program Library (GFMPL). A37. A white balloon. A38. The upper-air code allows a large volume of data to be transmitted internationally by using only a small number of characters. The code also provides for rapid evaluation of data through the use of computers. A39. Mobile land sites A40. At the synoptic hours 00Z, 06Z, 12Z, 18Z. A41. The 00Z or 12Z synoptic hour, whichever is closest to sunrise. 1-34