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