Part 1: Data Tables
If you are using the Weather Learning Log, students should make the tables exactly as they appear in the activity. If you are using the Student Worksheet, they can simply record their measurements in the tables. As an optional activity, you can make a wall-sized table to record and share the data.

Part 2: Use the Internet to observe weather

1. Class Instruments: As in the previous activity, it is recommend to arrange the students in teams with specific tasks assuring that each team member has a role.
Before students begin to take measurements, you should discuss how to make entries in the weather log using the table. For example, students in each group can take turns making entries, but all should go outside and participate in the data collection.
• Students should record the time of day that they are taking the current measurements in the "Time Conditions last updated" cell under Class Instruments.
• IMPORTANT: Above all, emphasis should be placed on making careful observations and recording them accurately.
2. Your City / Town: The first thing you should do before students access the Weather Underground web site is log on to the Internet and review the web pages with the students. You should begin by explaining how to access the web page, how to enter a city's name in the "Fast Forecast" box in the upper left hand corner, how to read the weather data under the "Current Conditions" table, and how to access the archived weather data by scrolling down to "Historical" below the current conditions and selecting the date, and then clicking on "GO". You should also consider the following.
   • Tell the students that they will see several pieces of data reported, but that, for now, they will only look at the items in their table.
   • NOTE: if the exact location is not in the database, select the next closest city or town.
   • Explain that the last update refers to the last time the information was reported.
   • Explain that air pressure is measured in hPa, also known as millibars (mb). Commonly observed values at sea level vary between 970 mb and 1040 mb however the average is 1013 (at sea level). Sometimes, atmospheric pressure is also quoted in inches of mercury (in Hg). This is an older form of measurement related to measuring pressure using a mercury barometer. To convert the two terms, 1 in Hg is equal to 33.86 mb.
3. Barrow, AK: Students should repeat the steps above however for Barrow, AK.
   • NOTE: Many factors may be different between your city / town and Barrow, AK such as the time zone, latitude, etc. Students will be asked later in this activity to provide some reasons that might account for the different weather readings.

Part 3: Analyze the Data
The purpose of this section is to introduce students to the charts and graphs meteorologists use to compare and analyze weather data and how to analyze real-time weather data from the internet. Students will create and compare two bar graphs and one line graph comparing the temperature for the last 7 days for their city and Barrow, AK. Barrow was selected since your city / town will most likely have current weather conditions that are significantly different however you are free to select a different or additional city if you would like.

1. Class Instruments vs. the Internet: Students will create a bar graph comparing the temperature collected with the class instruments with the data from the Internet for their city / town. The purpose of this is so that they will both value the need to use accurate weather instruments when taking measurements and understand how the web site and meteorologists determine the weather data found on the page.
• Encourage the students to create a formula to convert units from the barometer and thermometer they created to standardized units, mb and ºC respectively.
2. Your location vs. Barrow, AK: Students will create a bar graph and answer questions comparing and contrasting your city with the weather data from Barrow, AK.
   • Several reasons that might account for differences in weather and temperature include different geographic locations of both cities (Barrow is located at 71° N, 157° W), the time difference between your city / town and Barron since these are real time weather readings, the last time the weather data was updated to the web page, etc.
3. Temperature for the last seven days: Students will learn how to access archived data from the weather web site and compare the two cities using a line graph to look for trends and/or relationships.