[gradsusr] Extrapolate the 1000mb Height

[HARVEY, PHILIP O NH-03 USAF AFMC 412 OSS/OSW]

Andrew:

Some legacy code from our sounding system post-processing computes the 1000
MB height as follows (and works quite good):

x = 0.0611 * 10 ^ ((7.5 + t(1)) / (237.3 + t(1))) * rh(1)
v = (t(1) + 273.15) / (1 - 0.379 * (x / p(1)))
cm = v + 0.02774 * (1000 - p(1))
h1000 = gphft(1) * 0.3048 - (67.422 * log10(1000 / p(1)) * cm)

The gphtf(1), t(1), rh(1) and p(1) are the geopotential height (ft), temp
(C), rh (%) and pressure (mb) at the surface level.

Phil



-----Original Message-----
From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org]
On Behalf Of Andrew Revering
Sent: Sunday, November 03, 2013 10:27 PM
To: GrADS User List
Subject: [gradsusr] Extrapolate the 1000mb Height

Is there a good way to extrapolate where the 1000mb height would be?

For example, in doing a 1000mb to 500mb thickness, I have the 500mb height,
and I have the surface elevation, but I do not have the calculated 1000mb
height to create a thickness map.

How is that done? Obviously its below ground over most areas, especially the
mountains.



Andrew Revering - Follow @andrewrevering
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Convective Development, Inc.
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