FPCN39 CWLW 241552
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 MONDAY 24 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    6     200   3     62    6    1000  30
KAMLOOPS     KEL      17    8     600   3     66    8    1000  12
OKANAGAN     KEL       9    5     350   3     61    8    1000  12
CASTLEGAR    SPOK      9    5     500  15     52    7     800  15
CRANBROOK    SPOK      9    3     950  30     49    3     950  15
REVELSTOKE   KEL       9    4     450   3     39    5     650   6

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  26   W   52
CRANBROOK             W   20   W   59

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.     10    3     950  10     62    5    1450  15
PR. GEORGE   P.G.      9    5     700  10     61    6    1300  15
SMITHERS     P.G.      9    3     500  10     57    4    1200  15
WELLS GRAY   P.G.     10    5    1000  15     83    6    1450  18
FT NLSN      F.N.      9   -8     400   4      9   -8     400   4
FT STJOHN    F.N.     30    3    1000   7     61    4    1050   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   50   W   56
SMITHERS              SW  39   SW  56

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    9     100  23     60   10    1000  15
FRASER VLY   QUIL      9    8      50   9     48    9     150  12
SRN VRISL    QUIL      9    8       0   8     55   10     450  13
CNTRL VRISL  QUIL      9    8      50   8     48    9     150   9
NRN VRISL    HRDY      9    7       0   5     60   10    1350   5
TERRACE      ANT       9    5     200   9     60    6     900  10
STEWART      ANT       9    5       0   4     19    6     100   4

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   26   SW  35   SW  44
PORT HARDY   S   44   S   50   SW  54
SANDSPIT     SW  35   SW  39   SW  43

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR TUESDAY: FAIR

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

END/MW