Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bulb thermometer reads 30° F (-1° C) and the wet bulb thermometer reads 28° F (-2° C). How would you encode the air temperature groups in the report?
• Look at the coding line on WS Form B-80 that shows 1snTTT and 2snTwTwTw for dry‑bulb and wet‑bulb air temperature in tenths of degrees Celsius. • Remember the Fahrenheit‑to‑Celsius conversion: C = (F − 32) × 5/9, then round to the nearest tenth of a degree. • For negative temperatures, the sign figure sn is important: usually 0 = temperature ≥ 0°C and 1 = temperature below 0°C.
• After converting 30°F and 28°F to °C, what tenths‑of‑a‑degree values do you get, and how would you write each as three digits (TTT)? • Which answer choices give you a group starting with 1 (for dry bulb) and correctly show a negative sign digit and tenths‑of‑degree value for about −1°C? • For the wet‑bulb temperature, once you have its Celsius value and sign, which remaining choices encode that value most consistently with how the dry‑bulb group was encoded?
• Verify that the dry‑bulb group you choose matches the format 1snTTT and represents about −1°C (or −1.1°C) correctly. • Verify that the wet‑bulb group you choose matches the format 2snTwTwTw and represents about −2°C (or −2.2°C) correctly. • Make sure the sign digit (sn) is the same (negative) for both dry‑ and wet‑bulb groups, and that the three temperature digits match the rounded tenths in °C.
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