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There are two ways to convert from Central Time to Greenwich Time. One is to go to the twelfth floor and look at the two clocks on the wall. One has the current local time, while the other one is set to Greenwich time. The other way is to just memorize the conversion:

To do the opposite conversion, you would subtract rather than add. And to convert from other time zones, you can either figure out the conversion yourself or first convert to Central Time.

Let's go back to the National Forecast Contest rules again. Suppose you're making your forecast on Monday. The deadline for entering your forecast is 00Z Tuesday. What's that in CDT? To convert, subtract five hours. What's five hours before midnight? 7 PM! There's your answer. Now, the forecast period starts at 06Z. To get Central Time, subtract 5 again, and you get 01, or 1 AM. So your forecast, made Monday afternoon, would be for the period beginning 1 AM Tuesday and ending 1 AM Wednesday.

Got it? Now take this little quiz for some more practice. You must get them all correct to continue. Raise your hand if you're stuck.

Convert the following from Greenwich time to Central Daylight Time.
1) 12Z
  1. 12 AM
  2. 12 PM
  3. 7 AM
  4. 5 PM

2) 15Z
  1. 3 AM
  2. 3 PM
  3. 10 AM
  4. 5 PM

3) 0830Z
  1. 8:30 AM
  2. 3:30 AM
  3. 1:30 PM
  4. 1:30 AM

4) 02Z Friday
  1. 2:00 AM Friday
  2. 2:00 AM Thursday
  3. 9:00 PM Thursday
  4. 7:00 AM Friday

Submit your answers to all preceeding questions.
Convert the following from Central Daylight Time to Greenwich Time. Convert the following to Greenwich time.
5) 12 Noon
  1. 07Z
  2. 17Z
  3. 12Z
  4. 21Z

6) 6 PM
  1. 06Z
  2. 18Z
  3. 23Z
  4. 01Z

7) 9 AM Eastern Daylight Time
  1. 14Z
  2. 09Z
  3. 13Z
  4. 15Z

8) 9 AM Central Standard Time
  1. 14Z
  2. 16Z
  3. 15Z
  4. 12Z

Submit your answers to all preceeding questions.

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Questions or Comments

Technical: E-mail John Fulton < jdfult@nimbus.met.tamu.edu >
Scientific: E-mail Dr. John Nielsen-Gammon. < nielsen@ariel.met.tamu.edu >

Copyright © 1996-2003 Texas A&M University, Texas A&M Atmospheric Sciences Department and Dr. John Nielsen-Gammon. All rights reserved.