WMOD00300 ‎(2)‎

• Contract/Permit #: 2-07-81-V0256
• Title: Cloud Physics Studies in SCPP From 1977-87
• Date: 10/1/1987
• Weather Modification - Doc Type: Report

~cve~ t~e ~~~GS i~creased r2?idly ~i~h he~ght. Along ~~e upper half of the

be.r::-ier

barrie~-~o~mal hl~CS iEcreased rapi~ly reaching soeeds,of 24

;"":.-0;:

c.rest..

:1p;.flr:C.

i..j..l...

__li't::

28_ m/s barrier jet was present at 1 km over the foothills

(Figure

Ld).

l~e ta~r~er ~et was illos~ly below 1 km agl based on data from Fresh

ror:c.

Tte rr.ees~red ver~~cal ~i~d shear of ~he bGrrier-pa~allel cosponent

~2S i~ cgree=ent ~l~~ the calculated ther~al wlnC ~si~g the measured

ho~~zJntal ~2e~3al gre31err:.

On~r :~e ~oothills the eddv dissipation rate (Figu:-e 4e)

2
was > 10 cm s

...; be:o~- 2 i(:].

? -3
was > 20 cm-s below 1

Ove~ t~e upper half o~ the barrier

k=. ~\ith sucn

a pro~ile of eaay dissipation rate, ground released material

s~ch as pollutants or cload seeding age~ts would not diffuse above ~1 km

~-'
--5..1..

That portion of the cloud which is colder than

-SoC and within
J..
"7 S v.t"t /-{sL

1 km

c>2.:.

car, ~e seeded fro~ ground generators.

The Dc??ler ca~a ~~dica:ed that tte wave crest ir. the airflow tilted

~;:;\o"in:i

~ro~ the Sier~c crest.

This incicates that (ne flow was

:jer=cd:~G~icclly staJle aae ~onlinear and that a leewave was present in

-~Q :ee of the cres~.

lhere ~ere o~~v a fe~ differe~ces in the airflow whe~ comparing

"'':,Q
,-..1.-

very stable case w~tn the slightly stable case.

Tho barrier jet in the

very stab~e case was stror.ger (28 vs 21 o/s) and slightly closer to the

Darr::er

,
t

. ,
KiTIj.

normal

~le ot~e~ difference was the

barrier

<1 k:J VS 1

~~ncs were ~Q becea~h ~he ve~y stable layer vs ~5 ~is lrr the slightly

S':2:_e r::.c:p

Tte nusero~s si~ilarities between the s~ructure of the

12

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'" -
"

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