FPCN39 CWLW 291420
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 PST SUNDAY 29 NOVEMBER 1998 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    2     200   1     33    5     800   4
KAMLOOPS     KEL      11    2     500   1     39    5    1200   4
OKANAGAN     KEL       9    1     350   1     39    5    1200   4
CASTLEGAR    SPOK      9    2     500   5     50    5    1400  10
CRANBROOK    SPOK     10    0     950  14     53    3    1800  14
REVELSTOKE   KEL       9    0     450   1     30    3    1000   4

*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    VR   5   SW  22   SW  63
CRANBROOK             SW  17   SW  44

TODAY'S VENTING: FAIR.

VENTING FOR MONDAY: 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   KEL       9   -4     950   7     28    0    1250   7
PR. GEORGE   KEL       9   -6     700   4      9   -4     700   4
SMITHERS     ANT       9   -6     500  33      9   -3     500  33
WELLS GRAY   KEL       9   -4    1000   7     26    0    1250   7
FT NLSN      F.N.      9  -18     400   7     17  -12     500   7
FT STJOHN    F.N.      9  -11     700   8      9   -7     700   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
PR. GEORGE            S   31   S   28
SMITHERS              SE  30   SE  28

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    5     100  22    100    8     950  30
FRASER VLY   QUIL     10    5      50  22    100    8     900  27
SRN VRISL    QUIL     20    6     300   4    100    9    1000  24
CNTRL VRISL  QUIL      9    1      50   4    100    9    1000  24
NRN VRISL    HRDY     10    6      50  24    100    8     800  27
TERRACE      ANT       9   -4     200  35      9   -2     200  35
STEWART      ANT       9    1       0  12      9   -2       0  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   28   SW  41   SW  41
PORT HARDY   S   31   SW  35   SW  33
SANDSPIT     S   35   S   35   S   37

TODAY'S VENTING: GENERALLY GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.

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


END/DSL