The NWS has made a change to that big 2.69″ rain total from yesterday. They decided to go by calendar day instead of the hourly observations. That means we have to take .07″ off Monday’s rain total. Their corrected statement is great (highlights are mine):
The deal is that observations have never been taken at the top of the hour at official stations. It has always been a few minutes before the top of the hour. When we say “it’s 103 degrees right now at 5pm”, that means the observation was 103 degrees at 4:53pm for example. Been that way my entire career and I assume a long time previous to that. As far as I’m aware, those have always been counted as “top of the hour” for stats. But maybe not and we typically don’t notice unless there is a heavy rain event right near the top of midnight? Can anyone from NWS comment on it?
This just means we were not tied yesterday for wettest calendar day ever…it’s #2 now.
The great shame, knowing I was .02″ off all evening long…
Chief Meteorologist Mark Nelsen