FPCN39 CWLW 091453
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 9 DECEMBER 1997 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       9    1     200   3     58    5    1450   8
KAMLOOPS     KEL      12    0     450   3     58    2    1450   8
OKANAGAN     KEL      12    0     450   3     58    2    1450   8
CASTLEGAR    SPOK     42    0    1050   7     55    1    1400   7
CRANBROOK    SPOK     30   -9    1150   5     63   -4    1450  10
REVELSTOKE   KEL      12    0     550   3     52    0    1450   8

*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    VR   5   W   15   W   26
CRANBROOK             NW  13   NW  31

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: POOR




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.     10   -3     950  14     60   -2    1550  11
PR. GEORGE   P.G.      9   -5     700   8     60   -3    1500  11
SMITHERS     P.G.     10   -7     650   1     70   -3    1500  12
WELLS GRAY   P.G.     10   -3    1000  14     75   -1    1500  14
FT NLSN      F.N.      9  -15     400  12     59  -14    1500  12
FT STJOHN    F.N.     11   -2     700  12     61   -1    1500  12

*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   43   SW  30
SMITHERS              S   70   S   30

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     23    5     250   9     44    7     950  11
FRASER VLY   QUIL      9    4      50   9     40    7     900  11
SRN VRISL    QUIL     14    3     100   5     34    7     800   9
CNTRL VRISL  QUIL     12    2     100   5     22    5     800   7
NRN VRISL    HRDY     27    5     250   8     46    7     800   9
TERRACE      ANT      11    1     250  11     51    2     850  11
STEWART      ANT       9    2     100  11     29    2     400  11

*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   37   S   41   SW  43
PORT HARDY   S   72   S   83   SW  74
SANDSPIT     SW  61   SW  65   SW  67

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR WEDNESDAY: FAIR TO GOOD.




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


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