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388 
Fpcn11 cwvr 060230
forecasts for coastal British Columbia issued by the Pacific weather
centre of Environment Canada at 7 PM PST Sunday 5 november 1995 for
tonight Monday and Tuesday.
The next scheduled forecast will be issued at 5 AM Monday.

Synopsis for coastal BC.
  A strong westerly flow of cool unstable air will bring some showers
with flurries at higher elevations inland this evening.  This flow
will gradually weaken overnight and Monday.  As a result showers and
flurries will be isolated tomorrow with lighter winds and more
frequent sunny breaks in most areas.  Clouds will increase over
Vancouver Island and the south and central coast Tuesday afternoon as
a significant weather system approaches the forecast district.

Freezing level..north..800 metres coast to 400 metres inland except
lowering to surface inland tonight.  South..1100 metres outer coast
to 700 metres inland except lowering to 300 metres inland tonight.

Greater Vancouver.
Tonight..cloudy with clear periods. Chance of showers. Locally windy.
 Low zero to 3.
Monday..cloudy with sunny periods. Patchy morning fog. Slight chance
 of showers. High 10.
Tuesday..increasing cloud. Chance of rain late in the day. Low near
 zero. High 8.
Probability of precipitation in percent 40 tonight. 30 Monday and
 60 Tuesday.

Greater Victoria.
Tonight..cloudy with clear periods. Chance of showers. Low 2.
Monday..cloudy with sunny periods. Slight chance of showers. High 11.
Tuesday..increasing cloud. Chance of rain late in the day. Low 1.
 High 8.
Probability of precipitation in percent 40 tonight. 30 Monday and
 60 Tuesday.

Lower Fraser Valley.
Tonight..mainly cloudy with clear periods. Chance of showers.
 Low minus 1 to 3.
Monday..patchy morning fog otherwise cloudy with sunny periods.
 Chance of showers. High 9.
Tuesday..increasing cloud. Low near minus 1. High 8.
Probability of precipitation in percent 40 tonight. 40 Monday and
 40 Tuesday.

Whistler.
Tonight..mainly cloudy with a few flurries....heavy at times this
evening. Accumulation 5 to 10 cm.  Low minus 3.
Monday..cloudy with sunny periods. Chance of flurries. High 4.
Tuesday..increasing cloud. Chance of rain or snow late in the day.
 Low minus 3. High 6.
Probability of precipitation in percent 80 tonight. 40 Monday and
 40 Tuesday.

Howe Sound
Sunshine Coast.
Tonight..mainly cloudy with a few showers. Chance of a
thundershower this evening. Low 2.
Monday..cloudy with sunny periods. Chance of showers. Gusty outflow
 wind developing late in the day. High 9.
Tuesday..increasing cloud. Chance of rain late in the day. Low zero.
 High 8.
Probability of precipitation in percent 70 tonight. 40 Monday and
 40 Tuesday.

East Vancouver Island.
Tonight..cloudy with clear periods. Slight chance of showers. Low 1.
Monday..cloudy with sunny periods. High 11.
Tuesday..increasing cloud. Chance of rain late in the day. Low zero.
 High 8.
Probability of precipitation in percent 30 tonight. 20 Monday and
 60 Tuesday.

West Vancouver Island.
Tonight..mainly cloudy with a few showers. Low 3.
Monday..cloudy with sunny periods. Slight chance of showers. High 9.
Tuesday..increasing cloud. Chance of rain. Low 1. High 8.
Probability of precipitation in percent 80 tonight. 30 Monday and
 40 Tuesday.

North Vancouver Island.
Tonight..mainly cloudy with a few showers. Low 2.
Monday..cloudy with sunny periods. Chance of showers. High 8.
Tuesday..increasing cloud. Chance of rain. Low 1. High 8.
Probability of precipitation in percent 80 tonight. 40 Monday and
 60 Tuesday.

Central coast - coastal sections.
Tonight..mainly cloudy with a few showers. Low 4.
Monday..cloudy with sunny periods. Gusty outflow wind developing.
 Chance of showers. High 8.
Tuesday..increasing cloudiness. Locally windy. Low 2 coast to minus 4
 at the head of inlets. High 7 coast to 4 at the head of inlets.
Probability of precipitation in percent 80 tonight. 40 Monday and
 30 Tuesday.

Central coast - inland sections.
Tonight..mainly cloudy with a few showers or flurries. Low zero to 2.
Monday..cloudy with sunny periods. Chance of showers or flurries.
 High 3 to 5.
Tuesday..increasing cloudiness. Locally windy. Low minus 4 to
 minus 1. High 2 to 6.
Probability of precipitation in percent 80 tonight. 40 Monday and
 30 Tuesday.

North coast - coastal sections.
Tonight..mainly cloudy with a few showers. Low 3.
Monday..cloudy with sunny periods. Gusty outflow wind developing.
 Chance of showers. High 6.
Tuesday..sunny with cloudy periods. Locally windy. Low minus 1 to 2.
 High 3 to 7.
Probability of precipitation in percent 80 tonight. 40 Monday and
 20 Tuesday.

North coast - inland sections.
Tonight..mainly cloudy with a few flurries. Low zero.
Monday..cloudy with sunny periods. Chance of showers or flurries.
 High 2 to 5.
Tuesday..sunny with cloudy periods. Locally windy. Low minus 4 to
 zero. High 1 to 4.
Probability of precipitation in percent 80 tonight. 40 Monday and
 20 Tuesday.

Queen Charlottes.
Tonight..cloudy with clear periods. Chance of showers. Low 2.
Monday..cloudy with sunny periods. Chance of showers. High 8.
Tuesday..sunny with cloudy periods. Slight chance of a shower.
 Locally windy. Low near 2. High near 6.
Probability of precipitation in percent 40 tonight. 40 Monday and
 30 Tuesday.

End/cjd


616 
fpcn50 cwvr 052143
mountain weather forecast for coastal British Columbia issued by the
Pacific weather centre of Environment Canada in Vancouver at 2:00 PM
PST Sunday 5 november 1995 valid until midnight Monday.  The next
scheduled forecast will be issued at 6:00 AM PST Monday.

Precipitation intensity is forecast as an
hourly rate of snowfall water equivalent.
  Nil        light          moderate       heavy
no pcpn   up to 2.5 mm   2.5 to 7.5 mm   more than 7.5 mm

discussion..
        A quasi-stationary upper trough will persist over the next 36
 hours. It will maintain a surface reflection extending from
ketchikan southeastwards to jasper. To the north of the trough
the airmass is convectively unstable due to very low temperatures
aloft. Northwesterly flow south of the trough will pump moist and
cool modified maritime arctic air over coastal BC south of 55
degrees north. Weakening winds at higher elevations can be expected
to continue south of the trough.

The general pattern of precipitation expected in this kind of
pattern is orographic (upslope) precipitation on westward facing
slopes south of the trough and less organized precipitation near
peaks to the north. At higher elevations (for example the
coquihalla summit) the ratio of water (as measured in the hourly
precipitation figure on the observation) to snow
is less than the usually quoted 1:10. Hence a meaurement of 2 mm of
precipitation May indicate a fall of up 4 cm of snow.

By Monday afternoon southeast winds aloft will develop north of the
trough in response to building high pressure over the yukon and
central interior BC. Precipitation should dry up north of the trough
at this time.

With current thicknesses of 1000 mb to 500 mb
layer... Ranging from 520 dm in northest BC sloping upwards
to 534 dm on the southern tip of Vancouver Island....most
inland and higher elevation locations will receive snow in the form
of flurries today. The probability of flurries will gradually
decrease over the next 36 hours as the flow weakens.

Freezing level..800 meters north coast 900 meters central coast and
1100 meters south coast. Many below freezing near-surface layers
will persist today and/or form overnight at sheltered inland
Valley locations.

Extended outlook. Late Tuesday evening will bring a frontal system
onshore to the south coast. Outflow winds will pick up in advance of
the front Tuesday morning.  Precipitation will begin at southern
coastal areas as rain with snow expected above 1500 metres
and inland. Northern coastal and inland locales will remain in a
cool but more stable airmass with very isolated showers and
flurries. Wednesday's outlook is for the system to deepen rapidly
and to come onshore near cape scott. Freezing levels will jump to
near 2300 metres on the south coast accompanied by significant
rainfalls and wind. Snow will retreat to the highest coastal peaks
and areas of the central interior where a deep cold layer should
remain trapped.

South coast mountains.
Warnings.. None.
Light flurries...occasionally moderate on west facing slopes...
Beoming infrequent Monday.
Mountaintop winds..west 50 km/h diminishing to west 30
km/h overnight.

Location        precip to 4am   precip 4am-4pm   min  max
                Monday          Monday

south coast

squamish        6-15           1-5              -4    2
duffey lk       1-5            1-5              -4    0
allison pass    6-15           1-5              -5    0
Fraser canyon   6-15           1-5              -4    4



central coast mountains.
Warnings.. None.
Light flurries occasionally moderate on west facing slopes.
Flurries becoming infrequent overnight.
Mountaintop winds.. West 40 km/h diminishing to west 20 km/h
overnight.

Location        precip to 4am   precip 4am-4pm   min  max
                Monday          Monday

central coast

heckman pass    6-15            1-5             -3   -1


north coast mountains.
Light flurries becoming isolated this evening. Isolated flurries
Monday.
Mountaintop winds..west 20 km/h diminshing this evening shifting to
southeast 20 km/h early Tuesday morning.


Location        precip to 4am   precip 4am-4pm   min  max
                Monday          Monday

north coast

terrace tyee    1-5            1-5              2    4
bear pass       1-5            1-5             -2    0
ningunsaw pass  1-5            1-5             -5   -2
telegraph crk   1-5            1-5             -5   -2


confidence..good. The system producing light flurries in
the north is primarily convective hence accumulations will vary
greatly over short distances and small changes in elevation. The
same caveat applies for orographic precipitation in the south.


This mountain weather forecast was produced for BC ministry of
transportation and highways, snow avalanche programs and applies
specifically to those areas in the forecast.  If further information
or other products are required for local operations, please call
664-9033.

End/cjd