In the Current Conditions listings, why do amounts in the 1-hour Precip column not always add up to equal the 24-hour Precip?
A9. In our Current Conditions listings, 1-hour precipitation amounts do not always add up to equal the 6-hour and 24-hour totals. This is usually because the 1-hour precipitation amounts reported at airports get reset only once every hour. The resetting always takes place at the time of the routine observation (usually about :53 to :55 past each hour). If rapidly changing conditions warrant a special observation at a non-routine time, the observation will indicate an incomplete 1-hour total since the last routine hourly observation. If you are trying to corroborate the “hourly” precipitation with the 24-hour precipitation, you will only want to add hourly precipitation reports from the routine hourly observations around :53-:55 past each hour and throw out amounts reported in the special non-routine observations.
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