FPCN39 CWLW 241445
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PST TUESDAY 24 NOVEMBER 1998 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      16    5     550   2     43    9     750   7
KAMLOOPS     KEL      27    5     600   7     53    9     950   9
OKANAGAN     KEL      13    4     550   2     35    8     750   7
CASTLEGAR    SPOK      9    5     500  17     68    8    1000  17
CRANBROOK    SPOK     11    2     950  39     11    5     950  15
REVELSTOKE   KEL      10    2     500   2     24    5     650   7

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   SW  37   SW  91
CRANBROOK             W   26   W   70

TODAY'S VENTING: POOR INCREASING TO FAIR MOST AREAS THIS AFTERNOON.

VENTING FOR WEDNESDAY: FAIR

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     27    2    1150   9    100    5    2350  18
PR. GEORGE   P.G.      9    0     700   2     25    3    1050   5
SMITHERS     P.G.      9    0     500   2      9    2     550   2
WELLS GRAY   P.G.     26    2    1200   9    100    6    2550  19
FT NLSN      F.N.      9  -11     400  15     45  -10     650  15
FT STJOHN    F.N.     49   -7     900  23     58   -3     950  15

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   46   SW  57
SMITHERS              S   33   S   57

TODAY'S VENTING: POOR BECOMING FAIR TO GOOD MOST AREAS. EXCEPT
REMAINING POOR AT PRINCE GEORGE AND OVER THE BULKLEY VALLEY.


VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    7     100  46    100   10    1150  51
FRASER VLY   QUIL     ##   ##     ###  ##    100   11    1250  51
SRN VRISL    QUIL      9    8       0  23    100   11    1200  45
CNTRL VRISL  QUIL      9    6      50  23     55    8      50  23
NRN VRISL    HRDY      9    6       0  21    100    8     850  24
TERRACE      ANT       9    0     200   7      9    3     200   7
STEWART      ANT      12    3     100   5     12    3     100   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   74   S  117   SW 146
PORT HARDY   S   63   SW  80   SW  83
SANDSPIT     SE  72   S   63   S   57

TODAY'S VENTING: POOR BECOMING GOOD MOST AREAS. EXCEPT REMAINING
POOR OVER THE NORTH.




VENTING FOR WEDNESDAY: FAIR




VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


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