[gradsusr] Scripting in GRaDS

[Rowell, Mason D.]

Jeff,

Does this equation fail to provide you with physically relevant RH numbers, or does grads not accept the format? I'm unfamiliar with the formula. For a less precise route, I would use dew_c, convert to kelvin and use inverse CC equation to find find es, and divide e (from CC equation and t_c, converted to kelvin) by es. Use the pressure and these to instead get w/ws for more accurate result.

Mason 
________________________________________
From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on behalf of Jeff Lake [admin at michiganwxsystem.com]
Sent: Monday, January 09, 2012 4:34 AM
To: Grads
Subject: [gradsusr] Scripting in GRaDS

Greetings ..
I have searched hi and low for someone else that has been in my situation.
I need to plot relative humidity, wind chill and heat index..
I have the needed perimeters from the GRIB data (Temp, Dewpt, & Wind speed)
now if this php, I could do it all day ...
I just can't seem to get a handle on the scripting language ..

anybody want to lend a hand converting the following??

rh = pow(10, (1779.75 * (dew_c - temp_c) / ((237.3 + dew_c) * (237.3 +
temp_c)) + 2));

--
-Jeff Lake
MichiganWxSystem.com
WeatherMichigan.net
TheWeatherCenter.net
GRLevelXStuff.com

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