FPCN39 CWLW 011458
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 1 September 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      18   21     650   2    100   27    3500   4
KAMLOOPS     KEL      23   21     900   3    100   27    3750   4
OKANAGAN     KEL      15   19     600   2    100   28    3700   4
CASTLEGAR    SPOK     20   19     800   4     90   27    1300   5
CRANBROOK    SPOK      9   18     950   5     97   27    2700   5
REVELSTOKE   KEL      10   16     550   1     65   23    1400   3

*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   15   S   31
CRANBROOK             VR   5   S   22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2000 m         25 C
SPOKANE         1200 m         25 C

TODAY'S VENTING: POOR IN THE MORNING BECOMING GOOD IN THE AFTERNOON.

VENTING FOR TUESDAY: GOOD.


VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD DURING THE AFTERNOONS.


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   4    100   22    3950   9
PR. GEORGE   P.G.     15   12     900   3    100   21    3700   8
SMITHERS     P.G.     16   13     900   2    100   22    3450   3
WELLS GRAY   P.G.      9   14    1000   4    100   23    4000   9
FT NLSN      F.N.     28   14     600  10    100   22    3750  11
FT STJOHN    F.N.      9   13     700  11    100   19    3750  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  28   S   35
SMITHERS              S   20   S   35

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         18 C
FT. NELSON      1000 m         18 C

TODAY'S VENTING: GOOD.


VENTING FOR TUESDAY: GOOD.


VENTING OUTLOOK WEDNESDAY THRU FRIDAY: POOR IN THE MORNINGS BECOMING
GOOD IN THE AFTERNOON.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   19     500   5     60   21    1000   7
FRASER VLY   QUIL     21   18     300   5     89   23    1550   9
SRN VRISL    QUIL     11   17     150   1     59   22    1050   6
CNTRL VRISL  QUIL     11   18     250   1     75   23    1400   7
NRN VRISL    HRDY      9   15     200   0     21   19     450   1
TERRACE      ANT      27   17     450   8     89   23    1600  10
STEWART      ANT      11   17     200   1     66   23    1100   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
VANCOUVER    VR   5   S   22   S   41
PORT HARDY   S   24   S   33   S   43
SANDSPIT     S   24   S   30   S   31

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE        n/a          n/a
PORT HARDY       300 m         22 C
ANNETTE           n/a          n/a

TODAY'S VENTING: GENERALLY GOOD EXPCET POOR IN AREAS ALONG THE OUTER
COAST.


VENTING FOR TUESDAY: FAIR.


VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR TO GOOD.


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

END/GF