6. The air pressure in millibars is shown in the bottom graph panel of the meteo
ID: 231350 • Letter: 6
Question
6. The air pressure in millibars is shown in the bottom graph panel of the meteogram. From 18Z on FEB 17th to 02Z on the 18th, the air pressure at San Francisco was [(rising)(constant) (falling)]. During this period the storm system and its front was sweeping generally eastward and approaching San Francisco.
7. At 00Z on the 18th, the pressure was about [(998)(1000)(1004)] mb. This value should be consistent with the response to item #4 above.
8. From 02Z until 13Z on the 18th, the air pressure generally [(fell)(remained steady)(rose)]. This rate of pressure change in the hour following 02Z occurred relatively rapidly compared to the previous several hours of the meteogram.
9. Between 02Z and 13Z on the 18th, the total pressure change was approximately [(4)(8)(12)(16)] mb. This rate of change of about 0.7 mb per hour.
10. The second panel from the top on the meteogram displays sky cover and winds. From 13Z on the 17th to 02Z on the 18th, the winds were generally from a(n) [(southerly)(easterly) (northerly)(westerly)] direction.
11. From 03Z to 05Z on the 18th, winds were generally from a(n) [(southerly)(easterly) (northerly)(westerly)] direction.]. The shift in wind direction sometime during the hour after 02Z was dramatic.
12. From 00Z to 06Z on the 18th, the weather symbols (dots) indicated [(snow)(fog)(rain)] was occurring at San Francisco.
13. The top panel of the meteogram shows temperatures and dewpoints. From 21Z on February 17th to 01Z on the 18th, the temperatures generally [(fell)(rose)]. The temperature then remained steady for the next hour.
14. During this same 21Z to 01Z time period, the dewpoints generally [(fell)(rose)].
15. Between 02Z and 03Z on the 18th, the temperature [(decreased relatively quickly) (remained steady)(increased relatively quickly)]. The dewpoint generally followed the same pattern.
16. The change of temperature in the one-hour period between 02Z and 03Z was approximately [(2)(6)(16)(28)] Fahrenheit degrees.
17. Compare the Image 2 meteogram’s temperature, dewpoint, and sea-level air pressure and wind direction changes at San Francisco from 02Z to 03Z on 18 FEB 2016 and refer to the Image 1 surface weather map. These values [(did)(did not)] imply the passage of a cold front through San Francisco during that time interval.
Explanation / Answer
6) falling
7) 1000mb
8) rose
9) 8
10) Southerly
11) Westerly
12) rain
13) fell
14) rose
15) decreased relatively quickly
16) 6
17) did imply the passage of cold front
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