FPCN39 CWLW 031449
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 PDT FRIDAY 3 OCTOBER 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      21   13     600   3    100   17    2350   8
KAMLOOPS     KEL      16   11     550   3    100   17    2750  11
OKANAGAN     KEL      14   10     500   3    100   17    2750  11
CASTLEGAR    SPOK     43   11    1000   8    100   15    1900  14
CRANBROOK    SPOK     39    8    1150  17    100   14    2900  18
REVELSTOKE   KEL      13   10     550   3     44   13    1200   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   SW  30   SW  65
CRANBROOK             SW  20   SW  54

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         13 C
SPOKANE         1100 m         11 C

TODAY'S VENTING: GOOD.



VENTING FOR SATURDAY: GOOD.



VENTING OUTLOOK SUNDAY THRU 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    5     950  16    100   13    3950  16
PR. GEORGE   P.G.      9    6     700  23    100   12    3700  17
SMITHERS     P.G.      9    4     500   4    100   10    2800  16
WELLS GRAY   P.G.    100    7    2850  16    100   13    4000  16
FT NLSN      F.N.      9    2     400  20    100    5    1350  21
FT STJOHN    F.N.    100    4    2300  22    100    8    3700  28

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   S   17
SMITHERS              E   15   NE  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       700 m          8 C
FT. NELSON       600 m          5 C

TODAY'S VENTING: GOOD.



VENTING FOR SATURDAY: GOOD.



VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     50   13     500  12     70   15    1200  20
FRASER VLY   QUIL     50   13     500  10     70   16    1200  20
SRN VRISL    QUIL     50   13     500  10     65   16     800  15
CNTRL VRISL  QUIL     55   12     500  15     75   15    1200  20
NRN VRISL    HRDY     83   12     400  33    100   15    1400  32
TERRACE      ANT       9    8     200   8     61   12    1550   5
STEWART      ANT      15   11     200   3     41   12     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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  43   SW  57   SW  61
PORT HARDY   S   39   SW  44   SW  46
SANDSPIT     NE  35   E   37   E   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      missing        missing
PORT HARDY       100 m         12 C
ANNETTE          200 m         12 C

TODAY'S VENTING: GOOD.


VENTING FOR SATURDAY: GOOD.



VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR TO GOOD.



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


END/GF