Upper Air Data Primary Instrument What do they typically measure How frequent Time Clock Used in Meteorology Goal take global meteorological measurements simultaneously International Standard for Time Universal Coordinated Time UTC UTC Zulu Z GMT DST March Nov CST Nov March Figure 2 1 pg 20 Displaying Rawinsonde Data Sounding collect data throughout the depth of the troposphere Wealth of info cloud base cloud top freezing level winds aloft how much precip precip type severe weather potential hail potential tornado potential etc Tropopause T inversion near the top of the sounding Winds Think of it like a dart cloud layer T Td Air Temperature T wind speed N 5 kts 10 kts Dewpoint Temperature Td temperature inversion 15 kts E W 25 kts 50 kts 65 kts S stratosphere Tropopause troposphere temperature inversion near top of sounding In cloud T Td Only showing the lowest part of the troposphere Really dry layer above Temperature inversion In fog cloud T Td See the questions in the notes section below Dewpoint Temperature Temperature Tropopause 255 mb temperature inversion near the top of the sounding DD 0