UDC 661.w8.1:661.573(73~‘1973.06” WEATHER AND CIRCULATION OF JUNE 1973 Warm in the North, Cool in the South

• Main Authors: Robert E. Taubensee-national, A Gulf, Alaska Low
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Canada; Gulf of Alaska; Pacific; Davis Strait; Alaska
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.395.1196; http://docs.lib.noaa.gov/rescue/mwr/101/mwr-101-09-0712.pdf

feature of the mean 700-mb circulation for June 1973 (figs. 1, 2). This Low was slightly east of its May position (Dickson 1973), as were the other major components of the wave train over the Pacific Ocean, in response, partially, to the continued strength of the midlatitude westerly flow. Wind speed along the axis of maximum 700-mb wind from south of Japan to the Washington-Oregon coast (fig. 3) averaged at least 5 m/s faster than normal over the entire route. The maximum departure, in excess of 11 m/s, was reached in the strong height gradient between the Gulf of Alaska Low and the broad subtropical ridge to the south. Mean 700-mb height departures fell over much of western North America from May to June (fig. 4) as short-wave impulses from the mean Low in the Gulf of Alaska moved eastward across the continent. The blocking High over western Canada weakened slightly and moved northward while the southern portion of the associated ridge was less amplified than it had been in May. Elsewhere, a strongly tilted trough stretched from a Low in the Davis Strait southwestward into Texas while a ridge was located along the Atlantic coast. FIGURE 1.-Mean 700-mb contours in dekameters (dam) for June 1973.