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20100310 weather data for the 24 hours to 5.30am at 800m

Field Observations:

27cm of 123kg/m3 snow in the last 24 hiurs. It is very heavy.

Date:
20100310
Cloud Cover:
Overcast
Precip type and rate:
S-1
24hr min temp:
-2C
24hr max temp:
2C
Present temp:
2C
24hr new snow (HN24):
27cm
New snow from current storm (HST):
35cm
Snow height (HS):
173cm
Weight of new snow (100mm tube dia):
260gm
Water equiv of new snow:
33mm
Density new snow:
123kg/m3
Surface crystal size:
173mm
Surface crystal form:
New Snow
Wind speed:
Light
Wind direction:
S
Barometric Pressure:
901mbar
Baro trend (last 3 hours):
Steady

20100309 weather data for the 24 hours to 5.30am at 800m

Field Observations:

Yesterday in the backcountry: an inversion with clouds below 2000m and blue above. Up to 30cm of powder on the frozen rain crust. Still not sticking very well.

Date:
20100309
Cloud Cover:
Overcast
Precip type and rate:
Nil
24hr min temp:
-3C
24hr max temp:
1C
Present temp:
-2C
24hr new snow (HN24):
0cm
New snow from current storm (HST):
17cm
Snow height (HS):
146cm
Weight of new snow (100mm tube dia):
0gm
Water equiv of new snow:
0mm
Density new snow:
0kg/m3
Surface crystal size:
2mm
Surface crystal form:
New Snow
Wind speed:
Light
Wind direction:
N
Barometric Pressure:
916mbar
Baro trend (last 3 hours):
Steady

20100308 weather data for the 24 hours to 5.30am at 800m

Field Observations:

Observations from yesterday in Hakuba's backcountry: 12cm in the valley translated into 25cm at 2200m in Tsugaike BC. There is little wind effect for a change, however despite being right way up, the new snow has not bonded with the March 6 melt freeze crust at all. I saw a size 1.5 avalanche triggered by another group and was myself able to easily trigger multiple size 1 slides on anything steeper than 35 degrees.

With continued snowfall and perhaps another 20cm up there these small avalanches start to become more serious with a possible total 40cm of storm snow at 2200m today that has not bonded with the crust below. We will be avoiding all steep terrain and taking care around small steep rolls on gentle terrain.

My Japan Avalanche Network report is here
http://nadare.jp/snowbbs/2010/03/100307-tsugaike-bc.html

Date:
20100308
Cloud Cover:
Overcast
Precip type and rate:
Nil
24hr min temp:
-2C
24hr max temp:
2C
Present temp:
-2C
24hr new snow (HN24):
12cm
New snow from current storm (HST):
20cm
Snow height (HS):
147cm
Weight of new snow (100mm tube dia):
65gm
Water equiv of new snow:
8mm
Density new snow:
69kg/m3
Surface crystal size:
3mm
Surface crystal form:
New Snow
Wind speed:
Light
Wind direction:
SW
Barometric Pressure:
927mbar
Baro trend (last 3 hours):
Steady

20100307 weather data for the 24 hours to 5.30am at 800m

Field Observations:

12cm of snow overnight and at lst below freezing temperatures have returned to the alpine terrain in Hakuba. Weather instruments are reporting amazingly calm winds, not a breath at times. What wind there is is from the south west - this is not a typical NW winter system bringing a lot of snow.

Date:
20100307
Cloud Cover:
Obscured
Precip type and rate:
S1
24hr min temp:
-1C
24hr max temp:
3C
Present temp:
1C
24hr new snow (HN24):
12cm
New snow from current storm (HST):
12cm
Snow height (HS):
138cm
Weight of new snow (100mm tube dia):
70gm
Water equiv of new snow:
9mm
Density new snow:
74kg/m3
Surface crystal size:
2mm
Surface crystal form:
New Snow
Wind speed:
Calm
Wind direction:
n/a
Barometric Pressure:
923mbar
Baro trend (last 3 hours):
Steady

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