FPCN39 CWLW 071400
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 TUESDAY 7 SEPTEMBER 1999 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      24   15     650   4    100   21    2800  10
KAMLOOPS     KEL      24   14     800   4    100   21    3350  10
OKANAGAN     KEL      13   12     550   2    100   20    2900   8
CASTLEGAR    SPOK     37   13     950   7    100   20    3500  11
CRANBROOK    SPOK     22   12     950   7    100   18    3950  12
REVELSTOKE   KEL      21   13     800   4    100   18    2750  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   NW  15
CRANBROOK             NW  11   NW  22


TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: 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.     30    8    1300   5    100   15    3950   8
PR. GEORGE   P.G.     62   10    1400  10     97   14    2100  11
SMITHERS     P.G.      9    7     500   6     80   14    1650  10
WELLS GRAY   P.G.     21    5    1300   5    100   16    4000  14
FT NLSN      F.N.     29   10     650   9     59   13    1100   9
FT STJOHN    F.N.     48   11    1200  10     76   14    1900   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  11   SW  19
SMITHERS              SW  17   SW  19

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE FORT NELSON AREA.

VENTING FOR WEDNESDAY: FAIR TO GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     57   14    1100   6     82   20    1750   7
FRASER VLY   QUIL     57   14    1050   6     85   21    1800   7
SRN VRISL    QUIL     20   13     450   3     78   20    1700   6
CNTRL VRISL  QUIL     55   15    1150   5     80   21    1800   6
NRN VRISL    HRDY     12   12     200   2     69   17    1550   7
TERRACE      ANT      12    8     200   2    100   13    3000   5
STEWART      ANT      10    9     200   2    100   14    3000   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   NW  19
PORT HARDY   SW   9   SW  19   W   24
SANDSPIT     S   70   S   69   SW  72

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR TO GOOD


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


END/mwso
$$$$^^