Accession Number : AD0290242

Title :   DETAILED ANALYSES OF SELECTED PACIFIC STORMS BASED ON CONTINUOUS RADAR RECORDS AND SHORT-IN TERVAL SERIAL ASCENTS. VOLUME V. CASE OF JUNE 5-7, 1961

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : REED,RICHARD J.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : Data and analyses are presented for the fifth and final case in the program of special radiosonde ascents. Included are original radiosonde records, pilot reports, continuous radarscope photographs, surface and upper-level analyses, and the Seattle time section for the period 5-7 June 1961. The radar echoes for this case showed three distinct phases which at first sight did not appear to be related to the synoptic pattern. Re-examination of the synoptic charts revealed, however, that the original analyses were incorrect. Instead of a single frontal passage with this storm, as originally analyzed, there were actually two. Both fronts had been present at an earlier date (3 June), but had subsequently been merged into one on the official history. The radar records, however, clearly showed that each front had maintained its identity, the echo pattern between the frontal passages being of distinctly different character than the patterns at the times of passage. This case also provided an excellent example of the manner in which cold or occluded fronts move inland during the warm season. Stable, maritime air remains lodged against the windward slopes of the mountains, while cooler air moves inland aloft. Upon passing the crest of the mountain range, the cooler air mixes to the surface in the relatively unstable air on the lee side. Thus the front reaches the interior valleys well before there is any change of surface air mass in the coastal valleys. (Author)

Descriptors :   *RADIOSONDES, *STORMS, AIR MASS ANALYSIS, METEOROLOGY, PLOTTING BOARDS, RADAR CROSS SECTIONS, RADAR NAVIGATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE