Snow and Weather Data

For the preceding 24 hours to 7am at 800m elevation.  Hakuba backcountry snowpack and avalanche conditions below are used at your own risk, Click -All- to view entire season data.

Date Snow Depth 24hr New Snow 24hr New Snow Density 24hr New Water Equiv AM temp Max temp Min temp Precip type and rate Rain Altitude
20190220
140cm
0cm
~ ~
3C
12C
1C
Nil
3,000m
20190219
146cm
0cm
~ ~
-2C
5C
-4C
Nil
~
20190218
154cm
0cm
~ ~
-11C
2C
-11C
Nil
~
20190217
167cm
15cm
~ ~
-3C
1C
-4C
Nil
~
20190216
156cm
1cm
~ ~
0C
2C
-2C
S < 1cm/hr
~

Hakuba Backcountry Conditions Summary

21 Feb 2019, AM update

Re-freezing with a little new snow after 4cm rain at valley bottom and rain to 3000m.

Outlook

Not much new snow in the coming days. Maybe some on Saturday. Day time freezing level generally around 1000-1400m.

Avalanche Hazard

At about 2000m: reducing danger as the saturated snowpack refreezes. Look out for any new windslab now sitting on a hard ice surface.

Snowpack Discussion

A new rain crust has forme over the entire mountain range and was shallow buried 20th night.

Official JAN Avalanche Bulletin

You should read it, but be aware that on some days this bulletin is not so accurate.  Visit the Japan Avalanche Network at www.nadare.jp. Their website is not well designed, so take care finding the info you need - it can take a few clicks to find the full bulletin, not just a summary. Their site doesn't work perfectly in some browsers. Make sure are you reading the bulletin for Hakuba, and for the current date. It is not in English, yet it is the only bulletin in Japan. Significant limitation - VERY IMPORTANT: due to Japanese forecasting laws, the JAN avalanche bulletin is only a statement of estimated conditions at 7am. It does not include changes to the avalanche danger that may occur during that day due to changes in weather. This makes it dangerously inaccurate on days when there is rain in the forecast for midday, or a rapid rise in temperature, or very rapid new snow accumulation.

The info on this page is intentionally brief. Use at your own risk.

Note on the data

This data is collected daily between 6am and 8am for the previous 24 hours at 800m in Ochikura near Tsugaike ski area. It is part of the daily risk management process in our backcountry guiding operation. Our weather station is in an area that receives more snow than the same altitude further south in the valley.

Rain Altitude is given if it rained at anytime in the preceding 24h hours. Sometimes it is an estimate, other times it is based on observation. In December you should always assume there is a shallow early season rain crust above treeline elevation.

Season Comparisons

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