9.4: Exercises for Chapter 9

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Page ID: 50110

Neel Desai and Alicia Mullens
De Anza College

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Chapter 9: Exercises

Decode the following METARs, giving Air Temperature (in °C), Dew Point Temperature (in °C), Air Pressure (in Inches of Mercury), Cloud Cover (both amount and height), Wind Direction (in degrees), and Wind Speed (feel free to Google search the IACO airport code for each airport if you are interested in seeing what airport you are decoding a METAR for):
1. KSJC 042053Z 14009KT 10SM FEW008 BKN028 OVC038 12/11 A2987 RMK AO2 RAE52 SLP113 P0003 60036 T01220106 58011
2. PHNL 052053Z 07008KT 10SM FEW024 SCT040 BKN065 26/20 A3002 RMK AO2 SLP166 T02610200 50001
3. KDEN 070153Z 26013KT 10SM CLR 08/M14 A2987 RMK AO2 SLP094 T00781139
Consider the map below, Figure 9.4.1. Decode the station models for cities a, b, c, d, and e, giving Air Temperature (in °F), Dew Point Temperature (in °F), Air Pressure (in Millibars), Cloud Cover (amount), Wind Direction (cardinal direction), and Wind Speed (in kts). NOTE: City b. has a wind speed indicated by one long feather and one short feather while city c. has a wind speed indicated by one short feather:

A U.S. weather map for January 11, 2026. — Figure \(\PageIndex{1}\): Surface weather observations. Alternative description in the text below (CC BY-NC 4.0; American Meteorological Society via Unidata).

Figure 9.4.1 is a Surface weather observation map of the contiguous United States showing station models plotted at reporting locations for a labeled observation time and date. State boundaries and coastlines provide geographic context. Each station model includes a central circle representing cloud cover, a wind barb showing surface wind, and surrounding numbers encoding surface variables such as air temperature, dew point, and sea-level pressure. Several individual stations are enclosed by rectangular callouts labeled with letters, indicating selected examples for closer interpretation. These highlighted stations demonstrate how surface weather information is encoded at specific locations. The map provides a snapshot of surface atmospheric conditions across the country for instructional analysis and forecasting.

Instructor's Note: Exercise 2 may not be fully accessible for all students with visual impairments, so it is suggestion that you have an alternative exercise prepared in case you have a visually impaired student who is unable to complete Exercise 2.

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