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Avalanche Risk (MSC)
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Mountain Conditions
Wednesday 16th September 2020, 08:33hrs: The snow-pack at all levels is now extremely variable after new snow and graupel was delivered yesterday by 100kmph+ NW winds. Generally anything windward is very scoured, whilst lee slopes have substantial build-ups (assuming wind-slab 1800m+). This mornings "snow" to 1500m has refrozen into hard ice sheets (though porous), whilst loose snow above continues to be transported to lee aspects by building NW winds.
Further heavy rain, NW gales, and snow 1400m - 500m is forecast over the next few days (Wed - Fri).
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15/09/2020 08:01hrs: Rainfall continues and is likely to for next 3-4 days. Snowfall has now lowered to 950m, though has been falling as graupel for past several hours; this will be introducing weak layering into the altitude snowpack. Substantial rainfall has now penetrated the snowpack up to 1800m in the past 48 hours; yesterday saw the development of wet snow slides out of steeper terrain features (up to Class 2 around the Philistine Bluffs).
Snowfall (although thunder storms are likely that does mean graupel/hail rather than "real snow") should lower to 600m by late afternoon, but will rise to 1100m once several new storm fronts arrive tonight.
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14/09/2020 12:12hrs: Raining quite heavily to 1600m at the moment (120mm on Pass so far), and has done so most of the night with rainfall to 2000m at times. Considerable amounts of snow-pack have been stripped off the sub-ranges to 1900m particularly on northern aspects, and there has been some wet snow avalanches triggered around the Main Range (mostly Class 1 & 2 noted so far, and associated with face deloads or steep, heavy altitude snow loads heading over bluffs - last seen out of Philistine Bluffs penetrating about 70m into valley scree. Heard some rumbles in head of Bealey Valley from Rolleston lookout @ 1200hrs but too murky to determine what/where this was associated with, imagine Bealey Slide amphitheater).
Low level snowfalls (600m) from NW are likely to develop for 24 hours from 8am tomorrow morning, in the meantime heavy rain is to continue with snowfall stepping down to 1500m initially.
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13/09/2020 07:37hrs: Strong & warm NW winds yesterday managed to strip off new snow on windward aspects up to 1750m. A new Spring storm is brewing for several days from now... heavy rain is expected on Monday (14th), with snowfall levels varying 1300m - 900m.
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10/09/2020 18:09hrs: Today's storm is passing about the Main Range, it delivered only about 12mm rainfall (so far at valley floor); this has fallen as snow above 1200m, with about 7-10cm delivered at 1800m by moderate southerly winds; new snow on raw ground has already melted back extremely fast. Further light snowfalls to lower levels are expected in the east (Craigieburn/Torlesse) until midday tomorrow.
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 09/09/2020 Mt Rolleston (2275m) - Chockstone Route
 08/09/2020 Mt Rolleston (2275m) - High Peak Access
 07/09/2020 Blimit (1921m)
 07/09/2020 Hills Peak (1640m)
 07/09/2020 Mt Cassidy (1850m)
 07/09/2020 Mt Philistine (1967m) - Southeast aspect
 07/09/2020 Mt Philistine - Philistine Bluffs (1967m)
 07/09/2020 Mt Philistine - Philistine Ramp (1967m)
 07/09/2020 Mt Philistine - Warnocks Bluff (1967m)
 07/09/2020 Mt Rolleston (2275m) - Otira Face (High Peak)
 07/09/2020 Mt Rolleston (2275m) - Otira Face (Middle Peak)
 07/09/2020 Mt Rolleston (2275m) - Otira Slide
 07/09/2020 Mt Rolleston (2275m) - Philistine Traverse
 07/09/2020 Mt Stuart (1906m)
 07/09/2020 Mt Temple (1913m) - West Face
 07/09/2020 Phipps Peak (1965m) - West Ridge
 06/09/2020 Avalanche Peak (1833m)
 05/09/2020 Grey Range
 05/09/2020 Mt Cheeseman (2031m)
 05/09/2020 Mt Olympus (2094m)
 05/09/2020 Tarn Basin (Tims Stream)
 03/09/2020 Lyell Peak (1828m)
 03/09/2020 Mt Bealey (1836m) - North aspect
 03/09/2020 Mt Rolleston (2275m) - Goldney Ridge
 03/09/2020 Mt Rolleston (2275m) - Rome Ridge
 02/09/2020 Kellys Range - Kelly Hill (1408m)
 02/09/2020 Mt Aicken (1858m) - 1863m Point
 02/09/2020 Mt Barron (1730m) - South aspects
 02/09/2020 Mt Rolleston (2275m) - Bealey Face
 02/09/2020 Phipps Peak (1965m) - South Face
Weather Information
| SEVERE WEATHER POSSIBLE IN NEXT 5 DAYS! | Friday
18 Sep
-2ºC | Saturday
19 Sep
-1 / 8ºC | Sunday
20 Sep
0 / 7ºC | Monday
21 Sep
2 / 7ºC | Tuesday
22 Sep
5 / 8ºC | Wednesday
23 Sep
2 / 10ºC | Click for more information
Update:19/09/20 01:30hrs |  |
LATEST DAILY READINGS
Update: 19/9/20 1:26hrs NZST
Sunrise: 6:29hrs
Sunset: 18:30hrs
Temperature: 4.4ºC
(Stable)
Temperature (Low): 4.2ºC
Temperature (High): 4.6ºC
Wind Chill: -0.6ºC
Humidity: 20%
(Rising)
Barometer: 1012.13mb (Rising)
Wind Speed: 18km/h
Wind Direction: W
Wind Gust: 53km/h (0:05hrs)
Cloud Base: 3355m ASL
Freezing Level: 1707m
Daily Rainfall: 0mm
24 Hour Rain: 3.81mm
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THIS STORM CYCLE (134hrs)
Rainfall: 255.0mm
High Rain Rate: 10.9mm/hr @ 17:20hrs 14/9/20
Temp Low: 0.4ºC @ 4:00hrs 16/9/20
Temp High: 8.7ºC @ 10:00hrs 17/9/20
Wind Gust: 105kmph @ 9:05hrs 17/9/20
Dom.Wind Dir: West
Barometer Low: 997mb @ 14:00hrs 15/9/20
SNOW MODEL
Last Update: 19/09/2020 01:04
Location: Mt Rolleston (Goldney Ridge) 1800m
Snow Fall-Line: 1180m
Alt. Temp: -0.5ºC
Alt. Windspeed: 34.3kmph
Alt. Av. Windspeed: 35.3kmph
Alt. Max. Windspeed: 36.3kmph
Alt. Wind Chill: -7.6ºC
Alt. Air Pressure: 808hPa
Alt. 3 Day Rainfall: 86.8mm (Today: 0.0mm)
Storm Snowfall (134hrs): 43.5cm
7 Day Snowfall: 50.2cm
Snowpack Depth: 141.4cm
Windslab N: 15.9cm
Windslab S: 43.0cm
Windslab E: 41.8cm
Surface Stability (@ 35º): Very Poor (Warning: Slab present!)
Avalanche Chance: 100%
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