ay
Although the abowe factors were cousidered, the apparent persistence of
the easterlies from approximately 230,000 to 260,000 feet was the main tool
used in making the forecast.
The actual ce-bour prediction for Tear vas a
wind from 060 degrees with a 60-kmot speed.
Interpolation between winds
masured 14 hours before and 12 hours after shor tine prowides a wind for
zero tine from 106 degrees with a 33-knot speed.
5.3.4
Observed Data
& total of 15 rocket-wind soundings were made before the Teac event; our
obserwation was made at 10Qv hours on D + 1 for postanalysis.
Table 5.1 lists
these obserwations cowering the period July l to Auguste 1, in addition to
winds computed from four observations made between August 5 aod August 12 in
epunection with prediccions for the Orange event.
Most observations vere
made at 1000 and 2200 local time to obtain 12- and 2h-hour wariations from
scheduled Teak zero time of 2200 LST.
Altitudes (HHH) are expressed in thou-
sands of feet, speeds (VVV) are in knots, and directions (DDD) are those from
which the wind was blowing on a 360-degree compass scale, with Sorth at 360
degrees.
Local time at Jobnstoo island can be obtained by subtracting 11 bours
from indicated Greenwich (Z) time.
Winds are computed only on that portion of
the plot which reflects automatic tracking of the target.
When it was necessary
to track mamally, data were taken on the size of the chaff cloud, but oo winds
were couputed.
5.3.5
Summary of Results
On the basis of these data only, several prominent features can be noted
in the wind structure between 210,000 and 260,000 feet.
Heights given as
dividing one zone from ancther are only approximate.
(1) a typical profile of wind wersus altitude through the layer between
230,000 and 255,000 feet shows persistent easterly winds.
Some winds with
important north-south components are observed, but no appreciable vesterly
flow is apparent in this layer.
In the mean, a speed maximcs appears to be
centered near 240,000 feet.
(2) The layers above 255,000 feet and below 220,000 feet, the rertica!
extents of which are unknown, are characterized by considerable wariability.
Westerly winds of appreciable magnitude are observed in these zones.
170
=
Chaff