th SatialSpanar nabted,
-
Se Ata atts aise Heat i Be oh at nok
‘teaitlin
depth of 3-6 inches.
et
alice
i
5
4
.
digit ia
ebeoshesfle.
PRR ees
It 1s difficult to estimate what the accuracy of these observations was, .
but assuming that the instrument was correct within 0.2° C., that the observer's readings were &
bo
correct within 0.2° C., that neither of these possible sources of error was consistently biased
and that both errors were distributed normally then 9 values out of 10 are correct within 03° BF
Fe and all are correct within 0.7* F.
TABLE 8.
KEITH:
THREE-HOURLY OBSERVATIONS.
See Notes for Table 6.
:
Experienced observers made the cloud and other observations during the following intervalsBF
(times are inclusive): 1200 Aug 18 -- 0900 Aug 19; 1200 Aug 21 — 0900 Aug 23; 1200 Aug 26
=-- 0900 Aug 27;
TABLE 9
1200 Aug 28 —~ 0900 Aug 29;
KEITH:
1200 Aug 30 -- 0900 Aug 31.
1
HOURLY RELATIVE HUMIDITIES.
This Note applies also to Tables 22 and 25.
The three-hourly values (0300, 0600, etce) are based on direct dry-bulb and wet~bulb
readings (Table 8).
rsf
The remaining values are taken from hygrothermograph charts, with ad just- 7
ments in absolute trace readings being made to fit the three-hourly values.
The three-hourly 3
values are al] correct within 6% and 9 out of 10 are correct within 4% (see Notes, Table 4).
For intermediate hourly values, these errors increase to 8% and 5%.
‘
Further, at values in the |
80s there is a small bias -- about 1% -- in the direction of giving values that are too low;
!
while in the 90s there is similar bias of about 22.
Since the hygrothermograph was checked regularly (usually daily and at least every other
‘
day) times are correct within 15 minutes.
TABLE 10.
MACK:
DAILY OBSERVATIONS.
This Note applies also to Table 26.
rig
we OF
ee Og
sm
eg we SS
a
The Notes for Table 6 apply for all items except RR, DDFF, Sea, and Remarks.
Cloud, wind,|
sea, and other observations were made by experienced observers on all dates except August 26th |
through 29th.
RR.
j
Unavoidably, the raingage was not well exposed (see General Notes and Figure 7).
Therefore readings may be in error by as much as 20%, with values probably tending to be too
low when the wind at time of rainfall was between NNW and NNE and too high when it was between|