FPCN39 CWLW 251434
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Monday 25 August 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      28   20    1300   2     98   24    2900  20
KAMLOOPS     KEL      28   19    1450   2     77   24    3350   8
OKANAGAN     KEL       9   16     550   0     74   22    2850   8
CASTLEGAR    SPOK     23   17     900   3     68   22    2950   8
CRANBROOK    SPOK     24   16    1350   4     80   22    3950   7
REVELSTOKE   KEL      11   16     800   1     82   20    2700   8

*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    VR   5   S   17   S   28
CRANBROOK             SW   9   SW  22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1900 m         20 C
SPOKANE         1000 m         17 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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.      9   15     950  18     90   20    3950  12
PR. GEORGE   P.G.     24   14     850  10     83   19    2400  12
SMITHERS     P.G.     10   13     600   1     71   18    3000   7
WELLS GRAY   P.G.      9   14    1000  18     90   20    4000  11
FT NLSN      F.N.     18   16     500   8     82   22    2700   8
FT STJOHN    F.N.      9   15     700   8     82   21    2850  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  24   S   28
SMITHERS              SE  20   S   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         20 C
FT. NELSON       700 m         21 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     64   17     450  20     70   19    2700  11
FRASER VLY   HRDY     69   18     550  17     70   20    2450  11
SRN VRISL    HRDY     59   17     400  17     68   20    2400  14
CNTRL VRISL  HRDY     59   17     400  17     63   19    2450  10
NRN VRISL    HRDY     43   16     300  14     68   18    2400  12
TERRACE      ANT      77   16     800  18     70   19    2550  10
STEWART      ANT      55   16     450  13     73   19    2750  10

*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   24   S   37   S   39
PORT HARDY   S   28   S   35   S   41
SANDSPIT     S   20   S   24   S   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      MISSING
PORT HARDY       700 m         17 C
ANNETTE         1000 m         17 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD




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

END/JMS