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Rain measurement: Difference between revisions
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= Precipitation measurement and Cumulus = | = Precipitation measurement and Cumulus = | ||
Cumulus processes rainfall in one of two [[cumulus.ini| units]] (millimetres and inches). | |||
Most processing by Cumulus is based on the total rainfall count output by a weather station, see [[FAQ#My_station_invented_some_rain_that_didn.27t_really_occur.2C_and_I_want_to_set_it_to_zero_.28or_some_other_figure.29 | FAQ]] for more. | |||
The rainfall observations output by different weather stations varies, see [[Standard_log_files]] for the parameters that Cumulus tracks. Cumulus can also read rainfall from a separate RG11 optical gauge. | |||
== Rain day == | |||
The threshold value which the daily rainfall has to equal or exceed for the day to be considered a 'rain day' is set in [[Cumulus.ini#Section:_Station | RainDayThreshold]] and has a default value of ''-1'' that means 0.2mm or 0.01in. Alternative thresholds can be used by specifying a number in the units your configuration uses. | |||
== Cumulus View Menu == | |||
Cumulus 1 provides a number of ways to view derived rainfall. | |||
=== Highs and Lows === | |||
On the Cumulus '''View''' ''Highs and lows'' screens you can see those of the following appropriate to the chosen period: | On the Cumulus '''View''' ''Highs and lows'' screens you can see those of the following appropriate to the chosen period: | ||
* Highest Hourly/Daily/Monthly Rainfall | * Highest Hourly/Daily/Monthly Rainfall | ||
* High | * High [[#Rain_Rate|rainfall rate]] | ||
* Longest wet period (count of consecutive days with rainfall above configured threshold) | * Longest wet period (count of consecutive days with rainfall above configured threshold) | ||
* Longest dry period (count of consecutive days with rainfall below configured threshold) | * Longest dry period (count of consecutive days with rainfall below configured threshold) | ||
All of these values are also available from [[Webtags]]. | |||
=== ''This month/period/year'' screens === | |||
A number of values are shown for rainfall, these are calculated by summing field 14 (total rain today) from relevant rows in [[dayfile.txt]] (so will exclude the current meteorological day): | |||
# Total rainfall | |||
#* Total for this (any) month | |||
#* Total for this (any) period you want (select start date and end date) | |||
#* Total for this (any calendar) year is shown on 'This year' screen | |||
# Wettest day (equivalent to 'Highest Daily Rainfall' parameters of webtags) | |||
# High [[#Rain_Rate|rainfall rate]] | |||
# Rain days (count of days in period with rainfall above configured threshold) | |||
# Dry days (count of days in period with rainfall below configured threshold) | |||
# Days in period with snow falling (from [[Weather_Diary]]) | |||
# Days in period with snow lying | |||
==[[Webtags]] report == | |||
* For current, last 24 hours, yesterday (<#rfallY>), and this month; | |||
* For current, | **totals (<#rfall>, <#r24hour>, <#rmonth> all include rainfall so far today) | ||
* For today, yesterday, this month, this | * Annual rainfall web tag <#ryear> reports total for ''rainfall season'' year i.e. starting month set on Configuration | station screen | Annual rainfall frame; includes rainfall so far today, same figure as shown for 'This year' on main Cumulus screen) | ||
* Snow depth for current | * For today, yesterday, this month, this rainfall season, month-by-month, and all time; | ||
** hourly rainfall highs and timestamp, | |||
** daily rainfall highs and timestamp, | |||
**rain rate high | |||
* Snow depth for current [[Weather_Diary#How_do_I_change_the_time_a_diary_day_begins.2Fends.3F|day]] | |||
* Longest wet period (count of consecutive days with rainfall above configured threshold) | * Longest wet period (count of consecutive days with rainfall above configured threshold) | ||
* Longest dry period (count of consecutive days with rainfall below configured threshold) | * Longest dry period (count of consecutive days with rainfall below configured threshold) | ||
* Timestamp of last rain gauge tip (and, from version 1.9.4, how many days ago) | * Timestamp of last rain gauge tip (and, from version 1.9.4, how many days ago) | ||
* <#IsRaining> <#RG11RainToday> <#RG11RainYest> are available for Hydreon RG11 detectors only (the first applies to rain detection mode, the others apply to the tipping bucket mode) | * <#IsRaining> <#RG11RainToday> <#RG11RainYest> are available for Hydreon RG11 detectors only (the first applies to rain detection mode, the others apply to the tipping bucket mode) | ||
= Types of Rain Gauge = | = Types of Rain Gauge = | ||
