FPCN39 CWLW 281420
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 28 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      15    4     450   2     30    7     650   8
KAMLOOPS     KEL      16    6     600   3     52    8    1250  12
OKANAGAN     KEL      13    4     550   2     40    7    1000  10
CASTLEGAR    SPOK      9    2     500   8      9    4     500   8
CRANBROOK    SPOK      9    1     950   6      9    3     950  10
REVELSTOKE   KEL      10    2     500   2     13    4     600   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  20   SW  43
CRANBROOK             SW  19   SW  50

TODAY'S VENTING: POOR EXCEPT RISING TO FAIR OVER THE KAMLOOPS AND THE
OKANAGAN THIS AFTERNOON.

VENTING FOR MONDAY: 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.     25    2    1300   5     80    6    1900  12
PR. GEORGE   P.G.      9    1     700   4     65    5    1350  10
SMITHERS     P.G.     11    1     650   1     31    5    1200   4
WELLS GRAY   P.G.     15   -1    1600   8     75    6    2000  15
FT NLSN      F.N.     12  -15    1000   5      9   -7     400   4
FT STJOHN    F.N.     55   -6    1250  10     72   -4    1650   9

*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  22   SW  28
SMITHERS              S   26   S   28

TODAY'S VENTING: GENERALLY POOR EXCEPT RISING TO GOOD AT WILLIAMS
LAKE PRINCE GEORGE AND WELLS GRAY. GOOD THROUGHOUT AT FORT ST JOHN.

VENTING FOR MONDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10    9     100   9     40   10     800  15
FRASER VLY   QUIL     25    8     200   4     38    9     450  10
SRN VRISL    QUIL     26    9     350   7     42   10     650  16
CNTRL VRISL  QUIL      9    7      50   6     57    9     400  12
NRN VRISL    HRDY     10    6      50   4     65    8     550  14
TERRACE      ANT      10    1     200   8     10    3     200  15
STEWART      ANT       8   -2     300   4      9    3       0  11

*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   35   SW  50   SW  50
PORT HARDY   S   35   S   50   S   52
SANDSPIT     S   35   S   41   S   44

TODAY'S VENTING: POOR IN THE MORNING RISING TO FAIR OVER SOUTHWEST
BC EXCEPT GOOD OVER CENTRAL AND NORTHERN VANCOUVER ISLAND. EXCEPT
REMAINING POOR OVER NORTHWEST BC.

VENTING FOR MONDAY: POOR

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


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