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Weather Related Organizations => CoCoRaHS => Topic started by: LFWX on April 17, 2010, 02:57:14 AM

Title: Daylight Time or Standard Time
Post by: LFWX on April 17, 2010, 02:57:14 AM

I assumed that when the time changed to Daylight Saving Time I was supposed to take my measurements at 7:00am EDT, but after reading the summary issued each day by ILN it seems I could get up an hour later to take my measurements (8:00am EDT / 7:00am EST). http://www.nws.noaa.gov/view/validProds.php?prod=LCO&node=KILN
Most of the reports start showing up around 7:00am EDT.

Should I be using Standard Time or Daylight Time during the summer?

Title: Re: Daylight Time or Standard Time
Post by: wxtech on April 17, 2010, 07:23:06 AM

Daylight Time.  You should confer with your Regional and County CoCoRaHS Coordinators about reporting time.  Your reports should be at the same time as nearby observers so that your quantities can be compared with theirs. 
Al

Title: Re: Daylight Time or Standard Time
Post by: LFWX on April 20, 2010, 05:43:32 PM

I just received a reply from my regional CoCoRaHS coordinator:

"Hi Mike -

I believe the CoCoRaHS folks typically use 7am, but they allow flexibility, and 8am reports are frequently used. However, in terms of how we use the data here locally at the NWS Weather Office, as well as the Ohio river forecast center, precipitation data is more tied to GMT (Greenwich Mean Time) - in which we focus on 'hydrologic day.'  The Hydrologic day is from 12 GMT to 12 GMT (which, in the summer, is 8am to 8am).

We value your report and certainly will take it if it's at 7am or 8am! If you prefer to send your summer reports at 8am, that still works well for us.

hope this helps - Julie"