FPCN39 CWLW 051400
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 SUNDAY 5 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   17     700   3     87   19    1500  20
KAMLOOPS     KEL      39   17     950   6     86   21    1400  10
OKANAGAN     KEL      29   16     850   4     80   21    1400   8
CASTLEGAR    SPOK     24   15     850   5     63   19    1350   6
CRANBROOK    SPOK      9   14     950  13     79   19    1850   8
REVELSTOKE   KEL      11   13     550   2     60   15     850   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  13   SW  30   SW  57
CRANBROOK             SW  22   SW  57

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: 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   10    1200  10     80   16    2500  10
PR. GEORGE   P.G.     23   11    1200   8     78   16    2200   8
SMITHERS     P.G.     22   10    1100   6     73   15    2100   8
WELLS GRAY   P.G.     33    8    1300   8     82   14    2400  10
FT NLSN      F.N.      9   10     400   1     54   15    1100   6
FT STJOHN    F.N.      9   12     700  10     67   15    1350  18

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   SW  46
SMITHERS              SW  22   SW  46

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.


COAST

         UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     55   16     450  15     89   18     850  18
FRASER VLY   QUIL     54   16     450  15     88   18     800  18
SRN VRISL    QUIL     42   16     350  11     75   18     700  14
CNTRL VRISL  QUIL     56   17     550  11     89   19     900  15
NRN VRISL    HRDY     10   14      50   5     50   14     750  10
TERRACE      ANT      18   11     250   5     55   14     700  10
STEWART      ANT      17   10     200   5     53   13     600   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  35   SW  52   SW  57
PORT HARDY   W   39   W   48   W   50
SANDSPIT     NW  57   NW  59   NW  46

TODAY'S VENTING: GOOD.


VENTING FOR MONDAY: GOOD.


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


END/MWSO
$$$$^^