[CF-metadata] standards for probabilities

From: John Caron <caron>
Date: Tue, 15 Nov 2011 06:38:24 -0700

Hi Vegard:

I see some of these kinds of things from NCEP, encoded in GRIB, and Im
still trying to understand what they are. So, some questions from a
non-modeler:

On 11/15/2011 2:10 AM, Vegard B?nes wrote:
> Hi!
>
> I am trying to create a document containing various probability values for weather forecasts. But I do have some problems finding out how to express what I want to say using the cf metadata standard.
>
> I want to express such things as "25th percentile precipitation amount" (based on ensemble data), and probability that air temperature will be within 2.5 degrees of the forecast. How should I do this?

these are 2 different things, i guess?

1) "25th percentile precipitation amount" (based on ensemble data)

* so here the data values are precip amounts? calculated from the
cumulative distribution function (cdf) from an ensemble?
* do you typically have other percentile amounts in the same file, eg 50
and 75?
* presumably this is some distillation of the cdf, used when the
individual ensemble values are not in the file?
* is there any special handling that a generic tool could do, or is it a
matter a just making this data available to some specialized application
that you write?


2) probability that air temperature will be within 2.5 degrees of the
forecast

* so here the data values are probabilities between 0 and 1 ?
* do you typically have other probabilities in the same file, eg within
1 degree, or 5 degrees?
* is there any special handling that a generic tool could do with such info?

john
Received on Tue Nov 15 2011 - 06:38:24 GMT