Movenert of the cell sear
rniwetok to a position southeast of Majuro gave strong socthwesterly flow in the local erea on 28 Pebruary en? west south
west flow on ] Larch, replacing the light variable winds wich
existed on 23 - 25 February.
Contimed southward ootlor en4
a&prroach of following cell from west brought west to -orthrest
flow on 2 and 3 March.
(4)
At 50,000 feet, the slow movement of the clockwise ci~m
culation from a position northwest of Exiwetok to south of
Majuro changed the flow gradually from north northrest to
west southwest.
Aer 1 Uarch this circulation continued its
movenent to the southeast and weekened, vith flow in the local
area becoming west northwesterly.
(5)
At 60,00C feet, no clearly defined trend was presext.
{Ns
‘winds were cuite light and erratic at this level, with easterly
flow at higher levels.
These variable winds persisted through
PRAVO plus 3 days.
ad.
Differences between forecast and cbserved winds:
In regacd
to the differences between forecast and observed winds, reference
is cade toa report of Froiest 4.5, JIf THxa=, by Pa-mer, Lilier,
and Stopinski.
This report stcted that studies of the observa-
i
tional errors in upser wind ccservetions teen by GD/1 ezsimem
indicated thet for wind speeds above 10 knots, arprexiratelr 1f
per cent of the observations varied by sore than 20 degrees, eves
when the cbhservations were cade dy several Cifferent Grows =ots,
but vith the same aizberne unit.
The cifferences betmeer Forecast
goemeipiaitonn
wis
en ee ree or
incividual cells drifting ezstrard.
—
ae