21 Sep 2015

September 21, 2015


    Early Friday morning September 18, 2015. West Couloir Wedge Mountain. Info on Wedge

    Saturday at 1835 meters. We received 6.3 mm of rain at 660 meters.


    Satellite image from Saturday.

    Sunday-- September 20, 2015--Sunrise was at 06:55 hrs.

    Sunday was certainly on the wet side.

    Satellite image from early Sunday morning.

    Calm after the passing of the front Sunday evening 18:00 Hours. Warm front melted all the snow!


Weather Observations for September 21, 2015: taken at 06:00 Hours.

2180 meters      -1, Winds were 5-10 KPH from the SSW
1835 meters        0, Winds were 0-5 KPH from the W
1650 meters        0, Relative Humidity 100%
  660 meters      +6, Valley Temp, Max Temp Yesterday was +15.1. 25.1 mm recorded on Sunday.

On Sunday Squamish received 63.7 mm and Pemberton received 42.8 mm of rain.


   As of 06:45 Hrs this am we have clear skies and variable visibility above 1700 meters.

    Image from 08:30 Hours Monday morning September 21, 2015.

For the forecast, cold front moved through yesterday followed by some weak ridging giving us a mix of sun and cloud (mid-level) for this morning. Should see the cloud lift and dissipate later this morning for drier conditions with sun in a dry Westerly flow aloft. The ridge will strengthen for Tuesday (last day of summer) with sunny skies in a Southwesterly flow, but slide to the Southeast out of our region on Wednesday allowing the low to pump some cloud into the area for unsettled weather. Several lows (one off the Oregon coast others to the North) will bring cloudy skies and periods of light rain to the area for Thursday morning with moderate precipitation by Thursday night. As of now Friday is looking wet but Friday is a ways off so more on that in Friday's post. We are seeing a fairly cool active weather pattern by the end of the week so expect unsettled conditions into next weekend with the snow again appearing on the higher peaks. Continued inconsistencies in the models leave little confidence in the forecast past Wednesday.

The Autumnal Equinox is Wednesday September 23 at 08:20 Pacific Daylight time. Night and day are roughly the same amount of time. Officially the first day of fall, which is certainly looking like fall considering the freezing levels.


Rate of rainfall according to Environment Canada:

Precipitation in the form of liquid water droplets greater than 0.5 mm. If widely scattered, the drop size may be smaller. The intensity of rain is based on rate of fall. "Very light" means that the scattered drops do not completely wet a surface. "Light" means it is greater than a trace and up to 2.5 mm an hour. "Moderate" means the rate of fall is between 2.6 mm to 7.5 mm per hour. "Heavy" means 7 mm per hour or more.



    Dry Monday!!

    Weak ridging for today, improving as the day progresses.

    Ridge strengthens for Tuesday, we could see some convective cloud development.

    Ridge edges below the low to the North.

    Low will spin cloud and moisture our way by Thursday. Large upper trough offshore Friday.



ARTICLES:

Avalanche Fatalities in New Zealand low compared to other nations: Wilderness Magazine

Tignes Ski Patrollers injured after helicopter crash: France

Drones to search for avalanche victims: Gripped Magazine

Kiwi star has first hand experience with an avalanche: BenNevis

CDOT up against the weather installing new avalanche mitigation system: Gazex


    Multiple cloud layers in the Pemberton Valley Friday morning.

    Mount Currie Friday morning.

    Saturday morning overlooking Green Lake.

    Light rain Saturday afternoon.

    Roundhouse before sunrise on Sunday morning--warm front passing through--+8 Deg at 06:00.

    River of Golden Dreams Sunday afternoon after 31.4 mm of rain recorded Saturday and Sunday.

    Blue skies Sunday evening. Max gust yesterday at 2135 meters was 117 KPH at 13:00 Hours.

    There are hungry bears in the valley!!!

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