FPCN39 CWLW 181521
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 18 NOVEMBER 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    2     200   6     54    4     200   9
KAMLOOPS     KEL       9    3     350   6     66    4     350  10
OKANAGAN     KEL       9    4     350   6     70    5     650   8
CASTLEGAR    SPOK      9    3     500   6     61    4     750   6
CRANBROOK    SPOK      9   -1     950  22     31    0     950  22
REVELSTOKE   KEL       9    1     450   6     67    3     450   9

*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   S   15   S   22
CRANBROOK             W   11   W   33

TODAY'S VENTING: GOOD EXCEPT POOR IN THE SOUTHEAST.

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.      9   -4     950  15     23   -2     950  15
PR. GEORGE   P.G.      9   -4     700   7     23   -3     850   7
SMITHERS     P.G.     20   -2     800   5     40    0     900   5
WELLS GRAY   P.G.      9   -2    1000  15     19   -1    1000  15
FT NLSN      F.N.      9  -10     400   6     37   -9     900   6
FT STJOHN    F.N.     37   -7    1150   7     37   -7    1150   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
PR. GEORGE            SW  19   W   35
SMITHERS              S   11   SW  35

TODAY'S VENTING: POOR

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     20    9     200   9     83   10     400  15
FRASER VLY   QUIL      9    7      50   9     20   64     300  12
SRN VRISL    QUIL     14    9     150   4     61   10     450  17
CNTRL VRISL  QUIL     12    8     100   4    100   10     350  17
NRN VRISL    HRDY     19    8     200   6     69    9     400  12
TERRACE      ANT       9   -1     200  15     58    0     300  15
STEWART      ANT       9    3       0   7     59    0     200  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
VANCOUVER    E   37   SE  43   S   39
PORT HARDY   SE  63   SE  70   S   56
SANDSPIT     SE  54   SE  52   SE  44

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

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


END/PJS