1eSé observations was
,

These are estimates onlye

DDFF gives wind direction to & points and windspeed in knotse

lerver's readings Wer
e

—

the values may be taken as being correct within 20% of the
SWhere a range in knot 3 is given,

aS consistently biased
E ex

s when the observer was experienced or 40% when he was not.

Where a single speed

‘8 cOrrect within 0.304
:

Me figure is given, the values may be taken as being correct within 30% when the observer was
E experienced or 60% when he was note
as
SEA conditions are described in the Remarks in instances in which there was any doubt

apply.
E to what standard code number to

1¢ following intervals

1200 Aug 26 . 4 emall, low platform at the southwest corner of FRED.

»

The three- hourly

: Notes, Table 4).
ir, at values in the

pouth side, on which the shelter and raingage were mounted.

Platform #3 is that on the

(See Figure 7e)

These platform

temperature observations were taken with a psychron at a height of 5 feet (plus or minus 6
inches) above the platform itself.
TABLE 11.

MACK:

The values are correct within 0.5° F.

BI-HOURLY TEMPERATURES AND RELATIVE HUMIDITIES.

This Note applies also to Table 27.
For humidity values, the direct once-a-day RH derived from direct dry-—bulb and wet-bulb
readings were taken as being correct and the trace curve of the hygrothermograph was where
necessary adjusted accordingly.

Similarly, the thermograph trace was adjusted where necessary

to fit the direct dry-bulb reading and also the maximum and minimumthermometer readings.

In

Pe

that are too low;

He

eticine) eBndaZac palen

charts, with adjust-

Platform #1 is the

Platform #2 is the large middle platform

4 on the northern side, which has upon it the small shelter house.

é :
er

lb and wet-bulb

ta acTiaa

ee ee

lug 23;

Remarks give dry-bulb and wet-bulb readings on Platforms #1, 2, and 3.

least every other

both instances the necessary adjustments (both for the first and second Intensive Phase),
amounted to not more than 4% for RH or 2° F. for dry-bulb temperature.

Usually, they were less

than 2% and 1°.
It is estimated that all RH values are correct within 8% and that 9 out of 10 are correct

within 5%.
arks.

Cloud, wind,

except August 24th

There was no discernible bias in the RH chart values at MACK for values below 90%.

Above 90%, however, there appears to have been a bias of 1~2%, with the values being too low by
this amount and with the greater bias at the higher values.

It is estimated that bi-hourly temperatures are correct within 1.5° F., an estimate based

and Figure 7).

on the closeness of agreement with direct reading temperatures and with maximum and minimum

mding to be too

thermometer readings.

ien it was between

There is no evidence of bias in the thermograph trace.

Since the hygrothermograph was checked regularly (usually daily and at least every other
day), times are correct within 15 minut
es.

45
MI iin cee

eae

.

.

Se ae ce arteeee ee

toe

aw
.

-

.

~

re

Select target paragraph3