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

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3rv~~i~g a~d :!c~k (~982) ~ot on~y n3d the ~enefit ot se~~al rawinsonde

~~~~ b~= c~so ~cj s2~e~li~e d2~a to clarify ~~e kata~atic or split-front

f:.rs:- des~ribed

..Jj- :-!~les (:i962).

sc~ematic model from

Figure 14 is e

3ro~~i~g ~~~ Mc~k desc~~bi~g a kata~atic fro~t.

Note ?art~~ularily the

- - .
relB.:.:.ve

~- .
l.oC=.::J..O!:

the warm

cold =ront,

f:-cnt,

0= C1e

s~rface

the u::mer

co:'li

=rG~t a~~ ~he Sh field. Since b8th the British Isles and California lie on

the e2st side of t~e'At~arrtic and Pacific Oceans, respectively, this

st:Qges~s

!:ne

DossibE~tv
~ . '"

that each area experiences similar synoptic

~ea=~er Datte~~s.

--,~ se~~lOL c detai:ed ti~e-height analysis of ~he passage of a

ka~~~a~ic frc~t based S~ 5E~ 3-~ourly rawinso~de data ~~l: ~e presented.

.~~ Ly~a~~cs of t"e airf~o~ 2,-C the ~~crophysical processes in the shallow,

5~3~~e c~cg~apiic ~:C~~ ~allo~ing the passage of the upper level front

~l~~ ~e ~rese~~eG.

Fig~re 152-= is a ~~ce-heigh~ cross-sec~io~a: analysis of Sheridan

ra^~csGcie da~a fey r.r:e stern: on lL Yeoruarv 1983.

A nu~~e~ of feat~res

a~e re~e2~e1 !; eac~ figure:

the ~ropopause (TROP), the upper level front

(T~- !:"";
- ....--- _:,

near 3.5 k~ and the ~arm =ror.t (WF).

staY!.e lave~

(SL1

5~~!aCe cold fron~ could be ide~tifieri.

A~ead of the ULF ~he cloud tops

~e~e 9 tc iQ kG ~ith te~~erctures near -550C. Following passage of the ULF

. - c:c~~ tC?5 drcpped dra~Etically to ~3.5 k~ with temperatures of -5 to

~he 21:i~4~e 0= ~he TROP was well defiLec cn all soundings and

Ye~a~~eQ ne~~ee~ lO and 1: km.

Behind the ULF the air was neutrally

~~cyaLt a~c very dry.

Co~seq~e~tly, T only a~pears to have decreased a

~~~,. a3o~~t ~hile tte j l~~es rose ~.e. tilted drc~atically Epward. The

38

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