Author Topic: effect of wind on rainfall measurement  (Read 359 times)

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Offline ginahoy

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effect of wind on rainfall measurement
« on: August 31, 2021, 03:12:34 PM »
Hello, I know from past experience that identical, ideally placed rain gauges can still end up with different readings due to wind effects. Where I live (SE Arizona), the majority of our annual rainfall occurs during July-Aug monsoon season and is typically associated with thunderstorms and stout wind. I'm curious how official NWS reporting stations overcome wind effects.


Offline miraculon

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Re: effect of wind on rainfall measurement
« Reply #1 on: August 31, 2021, 04:42:30 PM »
Probably one or more of these, I have seen them surrounding the NWS rain gauges at the local (KAPX) site. They have several concentric rings of them.

https://www.campbellsci.com/windscreen260-953



Here is the NWS rain gauge installation at DFW:



Greg H.


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Offline miraculon

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Re: effect of wind on rainfall measurement
« Reply #2 on: August 31, 2021, 04:50:23 PM »
perhaps "Other Weather Software" is not the ideal location for this thread...

not sure what the subject has to do with weather software.

Greg H.


Blitzortung Stations #706 and #1682
CoCoRaHS: MI-PI-1
CWOP: CW4114 and KE8DAF-13
WU: KMIROGER7
Amateur Radio Callsign: KE8DAF

Offline ginahoy

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Re: effect of wind on rainfall measurement
« Reply #3 on: August 31, 2021, 05:20:03 PM »
Thanks, Greg. Sorry, I meant to post in "Other Weather Station Hardware"... perhaps the moderator will move...

Offline the beteljuice

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Re: effect of wind on rainfall measurement
« Reply #4 on: August 31, 2021, 07:27:19 PM »
Re. miraculon pics ....

The first is an 'Alter' windscreen.

The NWS installation is an odd mix of an inner 'Nipher' screen and an outer 'Alter' screen.

Explanations can be found here https://www.fs.fed.us/t-d/pubs/pdfpubs/pdf02252325/pdf02252325dpi72.pdf together with comparisons. Generally the 'Nipher' is used in snow locations.

... but you can do the same thing with one or two picket fences (the tops should be level with the top of the gauge)

Going back to 'old school' I have seen a few circular 'turf wall screens' in the UK at old Met Office sites.

You can even put them in a ground level 'pit' !
« Last Edit: September 01, 2021, 05:41:03 PM by the beteljuice »
Imagine what you will KNOW tomorrow !

 

anything