FPCN39 CWLW 221437
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 22 FEBRUARY 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      50    6     500  15     92    8    1150  15
KAMLOOPS     KEL      43    8     950   6    100   11    2800  11
OKANAGAN     KEL      13    4     500   4     59    8    1150   8
CASTLEGAR    SPOK     48    4     850  13     90    7    1350  16
CRANBROOK    SPOK     32    1    1050  19     97    4    1800  19
REVELSTOKE   KEL      10    3     500   3     11    4     500   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  30
CRANBROOK             SW  11   W   30

TODAY'S VENTING: GOOD LOCALLY POOR

VENTING FOR MONDAY: FAIR TO POOR

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.     54    3    1250  10     89    6    2300  10
PR. GEORGE   P.G.      9    4     700  10    100    7    2300  13
SMITHERS     P.G.      9    1     500   5     39    6    1000   8
WELLS GRAY   P.G.    100    1    1050  10     76    5    2000  10
FT NLSN      F.N.     62  -14     750  12     77   -8    1000  12
FT STJOHN    F.N.     59   -4    1250  12     63   -1    1100  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
PR. GEORGE            SW  24   SW  35
SMITHERS              SW  26   SW  35

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR MONDAY: FAIR TO POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     76    8     900  12     90   10    1150  13
FRASER VLY   QUIL     10    7      50  11     89    9    1100  13
SRN VRISL    QUIL     41    7     550   7     77    9    1000  11
CNTRL VRISL  QUIL     32    6     400   7     64    7     850   9
NRN VRISL    HRDY     33    5     250  12     76    7     850  13
TERRACE      ANT       9    4     200  18     85    6     900  18
STEWART      ANT       9    4       0  13     59    6     500  13

*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   20   SW  26   SW  31
PORT HARDY   S   26   SW  28   SW  28
SANDSPIT     SW  33   SW  35   SW  35

TODAY'S VENTING: 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/MWSO