CU-Boulder ATOC 1070 - Lab9 (2 pages)

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Lab9



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Lab9

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School:
University of Colorado at Boulder
Course:
Atoc 1070 - Weather and the Atmosphere Laboratory
Weather and the Atmosphere Laboratory Documents

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Sarah Rose ATOC 1070 Lab 9 Boulder Windstorms Section 8 Group Ana Ian Mike ACTIVITY A Foothills Mesa Elevation m Peak Wind Gust m s Time Wind Direction 1625 45 6 00 am 270 W 1885 44 10 00 am 270 W Pressure Temperature Dew Pt Temp 815 mb 7 deg C 7 dec C 769 mb 7 deg C 6 deg C ACTIVITY B Foothills Mesa Elevation m Peak Wind Gust m s Time Wind Direction 1625 25 8 00 am 300 W 1885 32 4 00 am 240 W Pressure Temperature Dew Pt Temp 838 mb 6 deg C 8 dec C 808 mb 0 deg C 15 deg C Question 1 At peak times the wind direction was west for both the Foothills and Mesa lab locations The pressure was relatively low and it was warm and dry The foothills lab location had the highest recorded gusts 45 m s Overall Mesa was more windy because of the variation in wind speeds and had higher average top wind speeds If you look at the data collected at the Mesa lab around 11 00 there is a dramatic change This change is due to the hydraulic jump This hydraulic jump affect also occurs at the Foothills location at 24 00 when all pressure and wind speeds and direction begin to change rapidly This is happening because the Chinook windstorm is ending and the atmosphere is returning to pre storm pressures and wind speeds The air cools and becomes more humid signaling the end of the wind storms Question 2 At the time of the peak wind gusts for both locations the wind was blowing form the west The pressures were relatively high at both locations and the weather was relatively warm and dry Mesa has the strongest peak gust Mesa was also the windier of the two locations the data showed a lot more fluctuation and higher average top winds then the Foothills Looking at the data at the time of 19 00 there s a very clear change in humidity both locations experience a rise in humidity as their temperature and dew point temperatures become closer together Looking at that information we know that the Chinook is ending the rise in humidity means the cool dry air that constitute a Chinook windstorm is gone We



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