Using the instruments found in your \"weather kit\" & “sling psychrometer,” take
ID: 802488 • Letter: U
Question
Using the instruments found in your "weather kit" & “sling psychrometer,” take one daytime and one nighttime weather observation (or ob) of as many of the seven weather elements as you can (air temperature, air pressure, humidity, sky condition, wind speed and direction, precipitation, and visibility).
a. Record your obs in a simple text format (do not forget to include proper units).
b. Draw your obs in "station model" format.
(You may use the National Weather Service Weather Prediction Center Website,
http://www.hpc.ncep.noaa.gov/html/stationplot.shtml,
to help you recall some of the 'station model' information).
c. Indicate the location of your ob (city), and the date & time (in both local & Zulu
times).
d. Were there any weather elements that you were unable to measure or observe at
the time? If so, what were they?
e. Discuss any differences or particular challenges between taking your day ob and
taking your night ob.
f. If you are in the United States, immediately after one of your obs, go to the
Weatherbug website, http://weather.weatherbug.com. Call up the station closest to
your location (Enter City or Zip Code) and record the current weather information.
Discuss any possible reasons for the Weatherbug readings being different from
yours.
(You may also verify your obs by comparing them to the local News weather
information during the same time frame).
2. View and include a printout a United States weather radar map and a United States infrared or daytime visible satellite image. From your radar map and image, choose an area in the United States under cloud cover or experiencing precipitation of some sort.
3. View and include a printout a Stuve Diagram from the cloudy (or cloudy & precipitating) location.
4. Based on your Stuve Diagram, and knowing that cumulus-type clouds tend to form in unstable atmospheres*, and that stratus-type clouds tend to form in stable atmospheres, indicate:
a. which atmospheric layers should have clouds present,
(be sure to include top and bottom boundaries [in millibars] for each layer).
b. whether the type of cloud for each designated layer should be cumulus or stratus,
*Consider unstable atmospheres to include both absolutely unstable & conditionally unstable conditions.
5. Additionally, indicate on your Stuve Diagram (in millibars):
a. the most stable layer of the atmosphere,
(be sure to include top and bottom boundaries for each layer).
b. the most unstable (or least stable) layer of the atmosphere,
(be sure to include top and bottom boundaries for each layer).
c. the level of the atmosphere with the warmest temperature,
d. the level of the atmosphere with the windiest conditions,
e. the level of the tropopause.
Explanation / Answer
a. Night time observation
The air temperature of the Chicago is 14 degree celsius on 28 september 2016 at 22:00. The pressure is 1018 mbar and the velocity of wind is 20 km moving from north direction. The humidity of the area is 87% and the weather is mostly cloudy with light rain. The visiblity of the area is 14 km and the dew point is 12 degree celsius.
daytime observation
The air temperature of Chicago on 28 september 2016 at 12:53 is 16 degree celsius. The wind is blowing at the speed of 16km/hour. The humidity in the air is 69%. Barometric pressure is 1013 mbar. Visiblity here is 16 km. The weather is partly sunny.
c. Observed location-
Chicago midway airport, Illinois, USA
Latitude-41.78 degree
longitude=87.76 degree
Date of observation-28-08-2016
Time of observation- 22:00( for nighttime observation) ,12:53 ( for day time observation)
d. We could not record the rainfall intensity as we were lacking the rain gauge instrument for measuring it and also because of limited time we had.
e. We could easily measure readings at day time but during night time because of darkness we could not accurately conduct the experiment and read the reading properly which could lead to erroneous results.
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