WMOD00405

• Title: Thermodynamic Features Affecting Convective Cloud Growth and Dynamic Seeding: A Comparitive Summary of HIPLEX Soundings 1975-1977
• Date: 7/1/1981
• Weather Modification - Doc Type: Report

7-2090 (4-B1)
Water and Power

TECHNICAL REPORT STANDARD TITLE PAGE

1. RE PORT NO. 1~;GQVIt~I\lMENTAe~a~t~.tt.lO: .. 3. RECIPIENT'S CATALOG NO.
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4. TITLE AND SUBTITLE 5. REPORT DATE
Thermodynamic Features Affectinq Convective July 1981
Cloud Growth and Dynamic Seeding: A Comparative 6. PERFORMING ORGANIZATION CODE
Summary of HIPLEX Soundings
1975-1977
7. AUTHORlSI 8. PERFORMING ORGANIZATION
REPORT NO.
9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO.
Bureau of Reclamation
PO Box 25007 11. CONTRACT OR GRANT NO.
Denver Federal Center
Denver CO 80225 13. TYPE OF REPORT AND PERIOD
COVERED
12. SPONSORING AGENCY NAME AND ADDRESS Thermodynamic Cloud Model
Same Analyses, 1975-77
14. SPONSORING AGENCY CODE
15. SUPPLEMENTARY NOTES
Microfiche and/or hard copy available at the Engineering and Research
Center, Denver, Colorado
Editor: EJH
16. ABSTRACT A statlstlcal summary of thermodynamic features generally consid-
ered relevant to convective cloud development and the dynamic seedi n9 hypo-
thesis, as diagnosed by a one-dimensional, steady-state model, was compiled
for selected High Plains locations. The summary is based primarily on ra-
winsonde data observed at MLS (Miles City, Mont.), GLD (Goodland, Ka ns. ) ,
and BGS (Bis Spri ng , Tex. ) , during the summer months of 1975-77, as part of
HIPLEX (High Plains eooperative Proqram). Data were stratified accordinq tc
the occurrence or nonoccurrence of convective clouds and, when clouds occur-
red, accordinq to cloud type as seen in geosynchronous satellite imaqery.
Geoqraphic comparisons show significant variations from north to south over
the High Plains--the most intense convection occurrinq in the central and
southern plains, the least intense in the north. Laroe annual variations
were noted i n mea n values of the thermodynamic features at each site amonq
the three summers. Mesoscale variability analyses of the thermodynamic fea-
tures show large spatial variations within an 80-km rawinsonde network. The
DMP (dynamic modification potential) diaonosed by the cloud model is strati -
fied by satellite-observed cloud types and mesoscale structures. DMP values
larger than 2 km were found in 50 nercent of the soundinos analyzed. DMP
predicted by the model is shown to occur when stable layers between -5 and
-15 oc 1 eve 1 s tend to inhibit natural convective cloud 9rowth.
17. KEY WORDS AND DOCUMENT ANALySIS
a. DESCRIPTORS--/ *convective cloud model analyses/ *meteorolooical datal
*weather modification/ cloud physics/ mesoscale analysis/ climatology/
satellite meteorology/ convective clouds/ cloud models
b. IDEN TIF IERS--! High Plains/ HIPLEX (Hi g h Plains Coopera ti ve Program)
c. COSA TI F ielc/Grout:' 04B COWRR: 0402 SRIM 550
18. blSTRIBUTION STATEMENT 19. SEcuRITY CLASS 21. NO. OF PAGE
Available from the Notional Technical Information Service, Operations {iH!S REPOR.Tl 205
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GPOB31-316