FPCN39 CWLW 011456
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 1 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       9    9     200   0     69   17     750  15
KAMLOOPS     KEL      14   15     700   1     60   19    1250   8
OKANAGAN     KEL       9   14     450   0     50   18    1050   7
CASTLEGAR    SPOK      9   13     500   3      9   15     500   3
CRANBROOK    SPOK      9   13     950  13     10   15     950  13
REVELSTOKE   KEL       9   11     450   0      9   13     450   0

*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    S   13   S   35   S   72
CRANBROOK             SW  22   SW  63

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1800 m         19 C
SPOKANE          900 m         19 C

TODAY'S VENTING: FAIR TO POOR IN VALLEY BOTTOMS. GOOD OVER HIGHER
GROUND.


VENTING FOR THURSDAY: GOOD


VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO 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.     72   12    2400   6    100   18    3950  10
PR. GEORGE   P.G.     11    8     750   4     95   15    2750   8
SMITHERS     P.G.     10    6     650   1     45   11    1300   7
WELLS GRAY   P.G.     58   10    2000   6    100   17    4000  10
FT NLSN      F.N.      9    4     750   0      9    6    1150   2
FT STJOHN    F.N.      9    6    1700   0     29    9    2150  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   63   S   83
SMITHERS              SE  30   S   83

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         13 C
FT. NELSON       NONE           N/A

TODAY'S VENTING: FAIR TO POOR IN THE VALLEY BOTTOMS. GOOD OVER HIGHER
ELEVATIONS.



VENTING FOR THURSDAY: GOOD



VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   14     100  22     65   16     400  22
FRASER VLY   QUIL     10   14      50  22     77   17     550  22
SRN VRISL    QUIL     20   14     200   7     59   16     400  15
CNTRL VRISL  QUIL      9   12      50   7     60   15     500  12
NRN VRISL    HRDY     10   11      50  13     65   14     600  13
TERRACE      ANT       9    9     200  18    100   12    1500  16
STEWART      ANT       9   10       0   8     52   12     400  13

*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    S   65   S   89   S  102
PORT HARDY   SE  87   S  102   S  113
SANDSPIT     NE  39   NE  28   E   24

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         18 C
PORT HARDY       800 m         16 C
ANNETTE          100 m         11 C

TODAY'S VENTING: FAIR TO GOOD.




VENTING FOR THURSDAY: GOOD.




VENTING OUTLOOK FRIDAY THRU SUNDAY: GENERALLY GOOD.




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


END/GF