[Bldg-sim] Fwd: Tracking Hurricane Florence through weather files

[Joe Huang]

Sent from my iPad

Begin forwarded message:

> From: Joe Huang <yjhuang at whiteboxtechnologies.com>
> Date: September 16, 2018 at 9:46:03 AM PDT
> To: Michel Kornmann <m.kornmann at bluewin.ch>
> Subject: Re: Tracking Hurricane Florence through weather files
> 
> Michel,
> 
> The data feed from NCEI actually reports liquid precipitation with two parameters: (1) amount recorded in mm, and (2) duration in hours over which the liquid precipitation was recorded. Since this kind of reporting is difficult for simulation programs to parse and digest, I wrote an algorithm back in 2010 that apportioned the reported values to hourly values, which got a little complicated to take care of overlapping and sometimes even contradictory reports. Since a lot of stations report daily or 8-hour values, I decided to change the unit to 0.1 mm to avoid large round-off errors (just think of how to apportion 6mm of rain over 24 hours). I've since thought of a better method of apportioning that would not require going to 0.1 mm precision, but have not used it for fear of confusion with the tens of thousands of files I've already produced and distributed.
> 
> Joe
> 
> Cc to BLDG-SIM in case there are others with the same question.
>  
> 
> Sent from my iPad
> 
>> On Sep 16, 2018, at 12:55 AM, Michel Kornmann <m.kornmann at bluewin.ch> wrote:
>> 
>> Hello Joe
>>  
>> Thank you for the records of the Wilmington weater station.
>> One point related to the liquid precipitation: what is the scale, mm or 0.1mm? is the liquid précipitation 250mm or 250 x 0.1mm, i.e. 25mm?
>> Thank you
>>  
>> Michel Kornmann
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