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— 150
—{ 200
— 300
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7
—| 400 2
= 20K
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— 500
im 25 t-—
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0
—| 600
—{ 700
—t 800
— 900
= 1000
Fig. 6—Distribution of potential vorticity computed from Fig. 4.
Lines of constant are drawn at intervals of 250 107° deg-cm-sec/g.
Strontium-90 beta activity at sampling sites in disintegrations per
minute per 1000 scf.
MISSION OF APR. 21 AND 22, 1963
The 310°K isentropic chart for April 22 at 00Z is presented in
Fig. 7. During the three-day period, the low in Wyoming moved east of
Nova Scotia. The low over Hudson Bay moved southward and eastward
to southeastern Canada, and the low off the British Columbia coast
moved southeastward into Nevada. Low stabilities associated with the
eastern Pacific ridge had advected across western Canada and isolated
large P,’s over the western United States,
As before, the WB50 and the RB57 aircraft were sent on northwest
to southeast flight tracks to obtain measurements southeast of the low
centered in Nevada. Note that the 310°K surface again intersects the
earth’s surface, but this time the area is larger and extends into
Colorado and western New Mexico.
The cross section along the flight tracks, Fig. 8, extends from
Winnemucca, Nev., to Albuquerque, N. Mex. Isentropic lines are drawn
for a 4°K interval, and the isotachs are again at intervals of 10 knots.
The heavy lines are guide lines to assist the reader in interpreting
Fig. 9.