Question on the inversion layer in to be observed by a "New" observation location above the Lower Yakima Valley of State of Washington related to The Columbia River drainage

From: wxqc-bounces@lists.gladstonefamily.net
[mailto:wxqc-bounces@lists.gladstonefamily.net] On Behalf Of Victor Engel
Sent: Monday, December 23, 2013 6:57 AM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] Temperature Inversions

A quick search turns up this.

http://www.dtic.mil/get-tr-doc/pdf?AD=ADA484750

On 12/23/13, Clay Jackson <n7qnm-lists@nwlink.com> wrote:
> Since I?m in an area (Lower Yakima Valley in Washington State) that gets
> VERY frequent inversions during the winter, I?ll jump in here. I?d also
> be very interested in finding a good source of inversion data ? among
> other things, inversions impact VHF (30Mhz) and above radio propagation.
>
>
>
> That?s important to me because my weather station (AU155/N7QNM-10) is
> ?APRS ONLY?. It?s solar powered with no link to ?the world? except a
> 5W transmitter into a pretty low-gain (3DbI) vertical antenna that?s 20?
AGL.
> The nearest (right now, I?m in the process of fixing that) ?iGate?
> (APRS->Internet gateway) is 46 miles from me, at an elevation of about
> 2,500? MSL (I?m at about 600?). That?s marginal in GOOD conditions.
> When
> we get an inversion (usually at about 1,000? MSL) it traps the radio
> waves BELOW the inversion and so my weather observations ?disappear?
> from the network.
>
>
>
> I?ve actually done a few ?informal? surveys using the thermometer in
> my car ? I?m about ? of a mile horizontally from the top of a plateau
> (Horse Heaven
> Hills) that rises from 600? MSL to about 1,500? MSL. Earlier this year,
I
> measured a 6 degree difference between the top of hill (42 degrees) and
> where we are (36 degrees). About a week ago, after a really cold spell,
> I
> measured a difference of almost 15 degrees, 47 on top (2,250 ? MSL),
> 32 at the valley floor (about 900? MSL) along Interstate 82 between
> Manastash Ridge and Ellensburg, WA.
>
>
>
> Wind is another interesting phenomena during inversions ? one might expect
> an inversion would only happen during ?flat calm? conditions. However,
> I?ve seen up to 10 knots here in the valley in the middle of an inversion,
> with 0-2 knots ?on top?. I?m pretty sure what I?m seeing is (air) flow
> along the valley floor that?s not really being impacted by ?macro?
> level conditions (I think there?s a technical term for that, but
> haven?t researched it yet).
>
>
>
> I?m trying to find a landowner at the top of the ridge that will let
> me put up another weather station (and an Amateur Radio Repeater).
>
>
>
> So ? if anyone comes up with something (or a cheap, legal way to do
> soundings); please post it here :)
>
>
>
> Clay Jackson
>
> N7QNM

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