ACCURACY OF OUR RAINFALL DATA

RELIABLE SOURCE

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What data does WaterWatch PRO use? An hourly digital rainfall footprint, produced by NOAA, that shows where its been raining across the Continental United States.


Every two minutes, a cadre of NOAA satellites, surface and upper-air observations, radar data, lightning reports, numerical weather prediction models and over 10,000 rain gauges, are fed through a series of proprietary algorithms to ultimately create a highly detailed picture of hourly rainfall. 


This raw data, maintained and supplied by NOAA, is enhanced by trained National Weather Service meteorologists who analyze the results and make necessary adjustments, discarding questionable data points. The resultant rainfall grid WaterWatch PRO uses is composed of data points spaced 1/2 mile apart. 


Each hour, WaterWatch PRO finds your GPS location within that grid and stores off the hourly values as well as keeps a running 24-hour total.


The National Weather Service uses rain gauges to calibrate this analysis field on a regular basis accounting for seasonal and climatological variability. How reliable is this data? The National Weather Service uses it in predictive models that produce flood guidance for critical safety decisions.


Our proprietary method delivers more precision to critical stormwater monitoring rainfall measurements. By using a computerized, automated system, WaterWatch PRO accounts for variances in time and space. 


This process makes WaterWatch PRO an ideal way to account for highly localized rainfall events, producing a  reliable NOAA data source you can confidently trust. 

RAINFALL - WHAT YOU DIDN'T KNOW

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It’s happened countless times – you’re caught in a torrential downpour, but the site you’re monitoring across town didn’t get a drop. Why is that? Different natural processes occur as clouds develop, move and produce rain. 


The weather systems that bring rain happen for a variety of reasons even though the result, water falling from the sky, is the same. However, that same variety of conditions 

results in rainfall that isn't uniform.


Additionally, due to the dynamic nature of weather systems, rainfall can start and stop erratically. You’ve got plenty to do, 

and wasting time driving needlessly 

to check dry sites isn’t one of them. 


While it may seem that simply sticking a rain gauge in the ground guarantees results, there can be wide variances. One issue with regular rain gauges is so-called “exposure”. The amount in the gauge could be lower than it should be as falling rain is blocked by nearby obstacles. Wind also plays a factor, as gusts can blow rain into or away from the gauge.  


Ultimately, you're depending on someone to go check the gauge as part of your stormwater monitoring process. In doing so, you're assuming that they don’t make a mistake or there isn't inaccuracy due to evaporation, the gauge doesn't get damaged or even stolen.


WeatherWatch PRO solves this by using an automated, accurate measuring method.