FPCN39 CWLW 201347
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 FRIDAY 20 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       9    7     600   0     24    9     850   2
KAMLOOPS     KEL      26    8     950   3     45   10    1300   4
OKANAGAN     KEL       9    5     550   0     27    8     950   3
CASTLEGAR    SPOK      9    5     500   5     24    7     800   5
CRANBROOK    SPOK     10    3     950  11     10    5     950  11
REVELSTOKE   KEL       9    4     550   0     17    6     800   2

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   S   26   S   54
CRANBROOK             SW  11   SW  33

TODAY'S VENTING: POOR LOCALLY FAIR.

VENTING FOR SATURDAY: FAIR.




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.      9    5     940  10     10    7     990  14
PR. GEORGE   P.G.      9    4     700  15     31    6     900  15
SMITHERS     P.G.     13    1     650   3     20    5     800   4
WELLS GRAY   P.G.     10    4    1000  10     18    8    1100  15
FT NLSN      F.N.     20  -18     650   4     26  -15     850   4
FT STJOHN    F.N.     14    0     950   5     31    2     950  10

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   S   57
SMITHERS              SE  48   S   57

TODAY'S VENTING: POOR

VENTING FOR SATURDAY: POOR EAST OF ROCKIES OTHERWISE FAIR.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11   10     100  33    100   12    1150  34
FRASER VLY   QUIL     11   10      50  33    100   12    1100  34
SRN VRISL    QUIL     25    9     200  10    100   11     750  28
CNTRL VRISL  QUIL      9    8      50  10      9    8      50  10
NRN VRISL    HRDY     48    7     350  14     57    9     450  14
TERRACE      ANT      10    2     200  34    100    5     700  37
STEWART      ANT       9    5       0  24      9    5       0  24

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   50   S   67   S   78
PORT HARDY   SE  96   S  117   S  135
SANDSPIT     SE 122   SE 109   S   89

TODAY'S VENTING: GOOD OUTER COAST OTHERWISE FAIR TO POOR.

VENTING FOR SATURDAY: FAIR TO GOOD.


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


END/MWSO