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805 
Fpcn11 cwvr 062330
forecasts for coastal British Columbia issued by the Pacific weather
centre of Environment Canada at 4 PM PST Monday 6 november 1995 for
tonight Tuesday and Wednesday.
The next scheduled forecast will be issued at 7 PM.

Synopsis for coastal BC.
  Colder arctic air in the interior has spread to northern coastal
areas and is flowing toward southern coastal areas.  As well
thickening clouds ahead of an approaching frontal system will spread
to southern portions of the forecast district this evening.
Scattered showers and flurries will become more frequent and
widespread overnight.  Because of the proximity of arctic air steady
precipitation will begin over mountain and many inland areas as snow.
Although low lying inland areas will see a rapid switchover of the
precipitation from snow to rain mountain settlements May receive a
significant accumulation before temperatures rise above the zero
mark.  The entire south coast can expect a considerable amount of
precipitation before the system responsible moves into the interior.
  Northern areas will see somewhat drier conditions Tuesday as more
organized northeasterly outflow winds become established.

Freezing level..north..800 metres coast to 400 metres inland lowering
to surface inland overnight.  South..1000 metres outer coast to 700
metres inland lowering to surface inland overnight.  Level rising to
2300 metres southern Vancouver Island Tuesday evening.

Greater Vancouver.
Tonight..mainly cloudy with showers or wet flurries over higher
 terrain. Low zero to 3.
Tuesday..rain mixed at first with snow at higher elevations.
 Rain heavy at
 times. Windy. High 8.
Wednesday..rain. Windy. Low 5. High 11.
Probability of precipitation in percent 70 tonight. 100 Tuesday and
 100 Wednesday.

Greater Victoria.
Tonight..mainly cloudy. Showers likely. Low 2.
Tuesday..rain beginning in the morning. Rain heavy at times. Windy.
 High 7.
Wednesday..rain. Windy. Low 5. High 13.
Probability of precipitation in percent 40 tonight. 100 Tuesday and
 100 Wednesday.

Lower Fraser Valley.
Tonight..mainly cloudy with showers or flurries. Low plus 2 to
 minus 1.
Tuesday..snow or mixed rain and snow beginning in the morning
 changing to rain before noon. Rain heavy at times. Windy. High 4
 to 7.
Wednesday..rain. Windy. Low 4. High 11.
Probability of precipitation in percent 40 tonight. 80 Tuesday and
 100 Wednesday.

Whistler.
Snowfall warning in effect.
Tonight..mainly cloudy. Flurries. Low minus 1.
Tuesday..snow beginning early changing to rain in the afternoon.
 Accumulations up to 20 cm. High 4.
Wednesday..rain. Windy. Low 4. High 8.
Probability of precipitation in percent 70 tonight. 100 Tuesday and
 100 Wednesday.

Howe Sound.
Tonight..mainly cloudy. Scattered showers. Low 1.
Tuesday..rain developing in the morning. Locally windy. High 8.
Wednesday..rain. Windy. Low 4. High 11.
Probability of precipitation in percent 40 tonight. 100 Tuesday and
 100 Wednesday.

Sunshine Coast.
Tonight..mainly cloudy. Low 1.
Tuesday..cloudy. Rain developing. Windy. High 7.
Wednesday..rain. Windy. Low 4. High 11.
Probability of precipitation in percent 20 tonight. 80 Tuesday and
 100 Wednesday.

East Vancouver Island.
Tonight..mainly cloudy. Slight chance of a shower. Low 1.
Tuesday..overcast. Rain beginning near noon. Windy. High 7.
Wednesday..rain. Windy. Low 4. High 11.
Probability of precipitation in percent 30 tonight. 90 Tuesday and
 100 Wednesday.

West Vancouver Island.
Tonight..mainly cloudy with showers. Low 1.
Tuesday..overcast. Rain beginning in the morning. Windy. High 7.
Wednesday..periods of rain. Windy. Low 3. High 10.
Probability of precipitation in percent 70 tonight. 100 Tuesday and
 90 Wednesday.

North Vancouver Island.
Tonight..mainly cloudy. Slight chance of showers. Low 2.
Tuesday..mainly cloudy. Showers. High 8.
Wednesday..periods of rain. Windy. Low 3. High 10.
Probability of precipitation in percent 30 tonight. 80 Tuesday and
 90 Wednesday.

Central coast.
Tonight..mainly cloudy. Chance of showers. Low minus 4 inland
 to plus 2 coast.
Tuesday..mainly cloudy.
 Locally windy. High 5 inland to 8 coast.
Wednesday..showers. Flurries inland. Windy. Low near 1 coast and
 minus 1 inland. High near 7 coast and 2 inland.
Probability of precipitation in percent 70 tonight. 20 Tuesday and
 90 Wednesday.

North coast.
Tonight..mainly cloudy. Scattered flurries inland. Low minus 2 coast
to minus 6 inland.
Tuesday..a mix of sun and cloud on the coast. Cloudy with flurries
inland. Locally windy. High 7 coast to 2 inland.
Wednesday..cloudy with sunny periods. Chance of showers or flurries
elsewhere. Locally windy.
 Low 2 coast to minus 4 inland. High 6 coast to 2 inland.
Probability of precipitation in percent 60 tonight. 60 Tuesday and
 30 Wednesday.

Queen Charlottes.
Tonight..mainly cloudy. Slight chance of a shower. Low 1.
Tuesday..mainly cloudy. Slight chance of a shower.
 High 8.
Wednesday..cloudy with showers. Windy. Low near 1. High near 7.
Probability of precipitation in percent 30 tonight. 30 Tuesday and
 80 Wednesday.

End/cjd


020 
fpcn50 cwvr 062147
mountain weather forecast for coastal British Columbia issued by the
Pacific weather centre of Environment Canada in Vancouver at 2:00 PM
PST Monday 6 november 1995 valid until midnight Tuesday.  The next
scheduled forecast will be issued at 6:00 AM PST Tuesday.

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..
       Slack flow aloft has permitted an encroachment of arctic air
well into the central interior and out to the coastline in northern
areas. A strong east-west oriented baroclinic zone off the
south coast is contributing to the formation of weak (stable) waves.
Most of the cloud and precipitation associated with these stable
waves is moving onto the washington coast however the zone itself is
pushing northward today. In fact a weak wave is moving onto
the south coast this afternoon but it is relatively dry. Falling
pressures within the baroclinic zone will help to draw arctic air
closer to the south coast today. Consequently, low level cold air
will encounter the leading edge of precipitation over southern areas
overnight and Tuesday. Many areas will see significant snowfalls
before enough warm air is advected over the district to modify low
level temperatures above the zero mark. Significant rainfalls will
follow.

Northern districts will experence dry cool outflows with little
precipitation.

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. Freezing levels over the south coast will rise
Tuesday afternoon to near 2300 meters south coast and 1600 meters
central coast.

Extended outlook. Wednesday will see the departure of organized
moisture inland. Freezing levels will gradually subside from 2300
metres early in the day to 1500 meters on the south coast late
Wednesday. Instability showers will develop throughout the day
giving significant accumulations to west facing slopes. Northern
coastal and inland locales will remain in a cool but more stable
airmass with very isolated showers and
flurries.

South coast mountains.
Warnings..heavy snow warning for Whistler.
Light flurries...intensifying to moderate snow Tuesday morning.
Mountaintop winds..west 20 km/h shifting and increasing to southeast
30 km/h overnight.

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

south coast

squamish        1-5           15-30             -4    3
duffey lk       1-5           6-15              -12   0
allison pass    1-5           6-15              -7    1
Fraser canyon   1-5           6-15              -2    4



central coast mountains.
Warnings.. None.
Light flurries.. Light snow begining Tuesday aternoon.
Mountaintop winds.. Southeast 20 km/h increasing to southeast 30
km/h Tuesday morning.

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

central coast

heckman pass       1-5            1-5             -6   0


north coast mountains.
Isolated flurries.
Mountaintop winds..southeast 30 km/h.


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

north coast

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


confidence..fair to poor. Model output is inconsistent from one run
to the next and between model versions. Timing could be out by 6 to
12 hours and the phase of precipitation ( liquid, freezing or
frozen) is strongly dependant on the rate of warm advection
aloft...a parameter that is varying from run to run within and
between the models.  Confidence is good on net precipitation
amounts.

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