Lab 9_Atmospheric Pressure and Winds 1
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Utah Valley University *
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Course
1010
Subject
Geography
Date
Dec 6, 2023
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4
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1
METO 1010 Online
Lab 9. Atmospheric Pressure and Winds 1
Instructions:
1) Type your answers in this Microsoft Word file and save your completed lab on your
computer. Do not modify the format of the file.
2) Upload your lab on CANVAS by the due date. To upload the file, go to the course homepage
and click on “assignments”. Click on the assignment that you want to submit, and on “submit
assignment”. In the “file upload” box, click on “choose file”
and select the appropriate file.
Finally, click on “submit assignment”. Only .doc, .docx, and .pdf files are accepted.
3) In questions that require calculations, you are not required to show every step of your work,
but the more detailed your answers are the more likely you are to receive partial credit for wrong
answers.
4) Proper units and terminology are always necessary.
1) Using the values for the average atmospheric pressure at sea level, perform the following
pressure conversions. Keep to decimal figures. (5 points)
a) 500 mb=__14.76________ in Hg
b) 30 in Hg=__1015.92________ mb
c) 30 in Hg=___762.00_______ mm Hg
d) 700 mm Hg=___27.56_______ in Hg
e) 40 mb=___4000_______ Pa
2) Go to the following website
https://forecast.weather.gov/MapClick.php?lat=40.2337&lon=-
111.6685#.W-XBgpNKhPZ
. Report the value for the current atmospheric pressure at the Provo
Airport. (0.5 point)
Atmospheric Pressure at Provo Airport (in Hg)= 30.23 in Hg
3) Convert into mm Hg and report the value below. Keep two decimal figures. (1 point)
2
Atmospheric Pressure at Provo Airport (mm Hg)= 767.84 mm Hg
4) Convert into mb and report the value below. Keep two decimal figures. (1 point)
Atmospheric Pressure at Provo Airport (mb)= 1023.71 mb
5) Convert into bars and report the value below. Keep five decimal figures. (1 point)
Atmospheric Pressure at Provo Airport (bars)= 1.024 bars
6) Convert into Pa and report the value below. Do not report any decimal figure in your final
result. (1 point)
Atmospheric Pressure at Provo Airport (Pa)= 102370.54 Pa
7) On a given day, you measure with your barometer an atmospheric pressure in Orem of 850
mb. You want to construct a sea-level map. What pressure do you report for Orem? Use a rate of
change in pressure vs. elevation of 100 mb/km. The elevation of Orem is 1445 m. (1 point)
8) Fill out the table below. Write the three-digit coded form for each pressure value given in the
“decoded pressure” column. Then write the decod
ed form for each coded pressure. Units are a
must. (6 points)
Decoded pressure
Coded pressure
Coded pressure
Decoded pressure
1051.1 mb
511
095
1009.5 mb
1037.5 mb
375
127
1012.7 mb
1018.6 mb
186
253
1025.3 mb
991.7 mb
917
589
1058.9 mb
986.4 mb
864
986
998.6 mb
999.9 mb
999
879
987.9 mb
3
9)
Go to the Weather Prediction Center’s website
(
https://www.wpc.ncep.noaa.gov/basicwx/94fndfd.jpg
). The map you see is the latest 24-hour
forecast surface map. Copy and paste the figure below. (1 point)
a) Based on the pattern of surface isobars on your forecast map, select two cities. One city should
be in an area where winds will be relatively fast and the other city should be in an area where
winds will be relatively slow. You have some flexibility here in the cities you choose, but one of
your cities should clearly have faster winds at the forecast time than the other based on the
pattern of surface isobars. If you need some help identifying two specific cities once you have
identified areas suitable for your choices, check out the interactive map at the United States
Climate page (
https://www.esrl.noaa.gov/psd/data/usclimate/states.fast.html
). Click on any state
to get a closer view with major cities labeled. Name your two cities and states where they are
located. (0.5 point)
b) Which city should have faster winds based on the pattern of surface isobars? Explain why this
is the case. (1 point)
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c) Based on the pattern of surface isobars, estimate the mean sea-level pressure at the city which
will have faster winds. Express the pressure value in millibars. (1 point)