FPCN39 CWLW 081348
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 WEDNESDAY 8 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      13    7     500   1     62   11    1000  10
KAMLOOPS     KEL      28    7     750   5     89   12    1600  11
OKANAGAN     KEL      11    5     500   1     53   11    1200   6
CASTLEGAR    SPOK     10    4     600   2     50   10    1300   7
CRANBROOK    SPOK     10    2    1000   2     50   10    1300   6
REVELSTOKE   KEL      10    4     500   1     38    8     950   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   30   S   63
CRANBROOK             S   15   S   37

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         10 C
SPOKANE         msg            msg

TODAY'S VENTING: Fair to good.

VENTING FOR THURSDAY: Good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Good.

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.     20    2    1350   5     70    6    2600  10
PR. GEORGE   P.G.     40    2    1100  10     80    5    1400  15
SMITHERS     P.G.     57    4    1100  10     80    5    1200  15
WELLS GRAY   P.G.     20    2    1300   5     70    7    4000  10
FT NLSN      F.N.     10   -3     400   2     45    0    1500  13
FT STJOHN    F.N.     20   -4     800   8     45    0    1500  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   39   S   48
SMITHERS              E   44   SE  48

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1303 m          5 C
FT. NELSON      1477 m          1 C

TODAY'S VENTING: Fair to Good.

VENTING FOR THURSDAY: Good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Good.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   12     700  20    100   14    1150  44
FRASER VLY   QUIL     90   10     650  15    100   15    1300  46
SRN VRISL    QUIL     90   10     650  15    100   14    1000  37
CNTRL VRISL  QUIL    100   10     700  25    100   14    1050  37
NRN VRISL    HRDY     71    9     600  15    100   12    1350  16
TERRACE      ANT      70    6     600  15    100    9    1400  36
STEWART      ANT      70    8     500  20    100    9    1300  25

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  39   S   46   S   44
PORT HARDY   SE  41   SE  44   SE  35
SANDSPIT     NE  35   E   31   E   31

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      no inversion
PORT HARDY      no inversion
ANNETTE         no inversion

TODAY'S VENTING: Good.

VENTING FOR THURSDAY: Good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: Good.

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


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