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[EnergyPlus_Support] Weather Converter Direct Solar Radiation Spikes

Hi,

I'm using the Weather Converter program to create an custom epw file. I've input global horizontal radiation data and allow the converter to create direct normal solar radiation data. The converter works well for the first month, but the direct normal radiation values spike several times for the rest of the data. I went through and checked that the global horizontal radiation data has no spikes. I'm using 15 minute intervals. Below is a readout of the audit file:

There were 26 warnings, all interestingly at hour 19.

 Warning ** DirectNormalRadiation   1910.5 > max theoretical=     6.3 Wh/m² on date= 3/27 at hour=19
 Warning ** Direct Normal Radiation=  1910.5 Wh/m² on date= 3/27 at hour=19
 Warning ** DirectNormalRadiation    593.5 > max theoretical=   347.6 Wh/m² on date= 3/30 at hour=19
 Warning ** DirectNormalRadiation   1736.2 > max theoretical=   186.5 Wh/m² on date= 3/30 at hour=19
 Warning ** Direct Normal Radiation=  1736.2 Wh/m² on date= 3/30 at hour=19
 Warning ** DirectNormalRadiation   1913.5 > max theoretical=   191.0 Wh/m² on date= 3/31 at hour=19
 Warning ** Direct Normal Radiation=  1913.5 Wh/m² on date= 3/31 at hour=19
 Warning ** DirectNormalRadiation   1602.2 > max theoretical=   195.7 Wh/m² on date= 4/ 1 at hour=19
 Warning ** Direct Normal Radiation=  1602.2 Wh/m² on date= 4/ 1 at hour=19
 Warning ** DirectNormalRadiation   1100.3 > max theoretical=   200.4 Wh/m² on date= 4/ 2 at hour=19
 Warning ** Direct Normal Radiation=  1100.3 Wh/m² on date= 4/ 2 at hour=19
 Warning ** DirectNormalRadiation   1080.5 > max theoretical=   205.2 Wh/m² on date= 4/ 3 at hour=19
 Warning ** DirectNormalRadiation > max theoretical         26 times


Any insight would be helpful.

Thanks,

Max



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