Station: Mt. Hamilton 80°42'S 159°23'E 1986 - 87 Season Date Time Sky Ceiling Vis Obst. To vis Temp (C) True Wind Sta. Pres Alt. Remarks 11/25 700 1/10 20,000 50 NIL -19 4.5/275° 26.02 3220' Cloud to south horizon 1800 SCT 6,000 50 NIL -17 3.5/270° 26 " Cloud cover to south 11/26 900 OVC 0 1/4. Light snow -7 3/240° 26.2 " Whiteout 1800 OVC 0 1/4. Light snow -12 NIL 26.15 " Whiteout 11/27 900 BKN 4,000 20 -12 4/340° 26.17 " Large cloudbank to N 11/28 900 SCT 10,000 50 NIL -18 2/250° 26.02 " Cloud on horizon to E, SE 1800 OVC 0 1/4. Light snow -12 NIL 25 " Whiteout 11/29 900 BKN 10,000 20 -12 3/300° 25 " Cloud to N/NE, S on mtn tops 11/30 1200 CLR 50 NIL -13 10/240° 25.15 " Position 2200 SCT 5,000 50 NIL -12 NIL 25.17 " 12/1 900 OVC 0 1/2. Light snow -10 NIL 25.19 " Whiteout 1800 OVC 1,000 2 Light snow -7 7/095° 25.34 " Ground & surface def poor 12/2 1900 BKN 2,000 5 -2 NIL 25.42 3,600' Patches blowing to W. surface def fair, ground poor 1800 CLR 20 Blowing snow -12 30/275° 25.2 " Wind began 11:00A, continued all day 12/3 900 SCT 5,000 50 -11 3/230° 25.18 " Cloudbank to E & some above main peaks to W 1800 SCT 15,000 50 slight blowing snow -13 9/240° 25.18 " Cloud to E moving closer, cloud to N & S horizons 12/4 900 SCT 15,000 50 -11 NIL 25.15 " Cloud bank to E on ice shelf 1800 BKN 4,000 20 -9 3/275° 25.15 " Cloud moved in S, SE during day 12/5 900 BKN 2,000 10 light snow -9 2/310° 25.22 " Several cloud layers. Ground def good, horizon fair 2000 CLR 50 -9 12/240° 25.17 " Drifting snow. Wind began 1900 12/6 900 CLR 50 -11 7/250° 25.2 " Wind all night. 12/7 900 BKN 2,500 15 light snow -6 NIL 25.48 " Clear on E horizon. Low cloud on main range. Fair&fair. 12/8 900 SCT 15,000 50 -6 NIL 25.7 " Cloud on eastern horizon 1800 SCT 15,000 50 -9 20/240° 25.72 " Cloud layers E, almost pushed & blowing snow 12/9 900 OVC 2,000 10 cloud -8 3/110° 25.72 " 1200 OVC 0 1 mod snow -2 8/100° 25.75 " Horizon & ground, poor & poor 1800 OVC 2,000 5 light snow -1 NIL 25.68 3950' Clearing to E, ground def poor 12/10 900 BKN 2,000 20 -1 8/130° 25.57 " 1800 SCT 6,000 20 5 NIL 25.51 " Cloud over main range 12/11 900 SCT 15,000 50 -2 2/270° 25.45 " 1500 SCT 15,000 50 10 NIL 25.48 " Cirrus moving in from N/NE. Very warm! 12/12 900 BKN 5,000 20 2 2/050° 25.51 " BKN high stratus with SCT cumulus 12/13 900 SCT 15,000 50 2 NIL 25.45 " 1800 SCT 15,000 50 -6 NIL 25.52 " High stratus to N & E 12/14 900 SCT 10,000 50 0 NIL 25.48 " High stratus to N & E 12/15 900 SCT 15,000 50 -2 NIL 25.45 " High stratus to N & E 12/16 900 SCT 9,000 50 -6 NIL 25.5 " Alto stratus to W & N 12/17 900 SCT 15,000 50 -6 NIL 25.5 " High stratus on E horizon 12/18 900 CLR 50 -5 NIL 25.42 " Wind during ? To 15 knots 270° 1800 CLR 50 -4 NIL 25.45 " 12/19 900 CLR 50 -4 NIL 25.45 " Moved to camp 4 12/20 900 CLR 50 -6 NIL/gusts to 10 knots/300° 25.1 " 2000 CLR 50 -6 7knots/300° 25.1 " NIL wind most of day 12/21 900 CLR 50 -5 NIL 25.09 " 1200 OVC 0 1/4. low cloud -2 NIL 25.1 " Cloud rolled in 1100hr from SE 12/22 900 SCT 5,000 50 -5 NIL 25 " Only cloud round Mts Dick & Egerton. 2100 SCT 5,000 50 -12 NIL 24.92 " High winds & low cloud on mt range 1500-1700 then clear 12/23 1200 SCT 2,000 20 -3 NIL 25 " Cloud to S on Mts Dick & Egerton & E horizon 12/24 900 CLR 50 -4 NIL 25.12 " 12/25 900 CLR 50 0 NIL 25.16 " 1800 CLR 50 -11 18/275° 25.12 " Blowing snow 12/26 900 CLR 50 -4 10/265° 25.1 " 2100 CLR 50 -1 NIL 25 " 12/27 900 CLR 50 -4 7/240° 24.94 " 12/28 900 SCT 6,000 50 -4 NIL 24.92 " Cloud to E & S - broken 1800 BKN 2,000 15 -6 25/220° 24.9 " Cloud moving in from SE. wind picked up 1500 12/29 0 OVC 1,000 2 light snow -2 15/180° 24.81 " Snow showers from south. Wind increasing over E 30min 900 OVC 100 1 med snow blowing snow -5 12/115° 24.85 " 1800 OVC 0 1/4. hvy snow blowing snow -3 15/185° 24.82 " Wind died till 1400. gusts to 25 knots 12/30 900 OVC 200 1/2. hvy snow -4 8/240° 24.92 " 9"snow fallen over last 36 hours 1800 OVC 200 1 mod snow -5 8/110° 25.1 " Barometer rising quickly 12/31 0 OVC 500 5 midd snow -3 NIL 25.18 " Ground & horizon def poor 900 OVC 1,000 10 light snow -3 NIL 25.2 " 1200 OVC 1,000 5 light snow 3 NIL 25.16 " Snow on rock ablating quickly 1800 BKN 5,000 20 2 NIL 25.12 " Cloud clearing from S & E 01/1 900 CLR 50 2 NIL 25.1 " 2100 BKN 10,000 50 -5 NIL 25.05 " High cloud moved in from E around 1900 01/2 900 OVC 10,000 50 0 NIL 25.1 " 01/3 900 SCT 8,000 50 -1 NIL 25.24 " Thin cloud band moving in from E - clear beyond.