FPCN39 CWLW 271417
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 SATURDAY 27 FEBRUARY 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      23    3     450   5     93    7    1350  13
KAMLOOPS     KEL      70    5    1150  11    100    8    2100  15
OKANAGAN     KEL      38    4     750   8    100    8    2100  15
CASTLEGAR    SPOK      9    1     500   5     32    3     850   7
CRANBROOK    SPOK     10    0     950  19     90    3    1750  17
REVELSTOKE   KEL      13    1     500   5     32    3     750   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  20   SW  52
CRANBROOK             SW  17   SW  50

TODAY'S VENTING: GOOD EXCEPT IN THE WEST KOOTENAYS.

VENTING FOR SUNDAY: 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.    100    0    2250  31    100    3    2650  34
PR. GEORGE   P.G.    100    0    1650  21    100    3    2350  27
SMITHERS     P.G.     56    0     950  14    100    2    1750  17
WELLS GRAY   P.G.     54   -2     850  10    100    3    2700  34
FT NLSN      F.N.      9  -11     400   7      9   -8     400   7
FT STJOHN    F.N.      9  -10     700   8      9   -5     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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   SW  31
SMITHERS              S   28   S   31

TODAY'S VENTING: GOOD EXCEPT EAST OF THE ROCKIES.

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100  41    100    9     650  44
FRASER VLY   QUIL      9    5      50  41    100    9     600  44
SRN VRISL    QUIL     16    7      50  15     95    9     550  28
CNTRL VRISL  QUIL      9    6      50  15     95    9     600  28
NRN VRISL    HRDY     89    5     500  29    100    7     700  28
TERRACE      ANT      10    1     200  21     96    3     900  24
STEWART      ANT      10    0     100  18     95    3     800  17

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   28   SW  46   SW  54
PORT HARDY   S   43   S   50   S   54
SANDSPIT     S   46   S   48   S   48

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD

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


END/LEC