FPCN39 CWLW 101354
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 TUESDAY 10 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    3     200   2     41    8     700   7
KAMLOOPS     KEL       9    4     350   2    100    8    2100  13
OKANAGAN     KEL       9    3     350   2    100    8    2050  13
CASTLEGAR    SPOK     25    2     800   6     49    5     950  11
CRANBROOK    SPOK      9   -1     950  18     76    4    1550  17
REVELSTOKE   KEL       9    3     450   2     10    4     500   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   SW  28   SW  63
CRANBROOK             SW  19   SW  61

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR WEDNESDAY: 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.     11    1     950  25     72    3    1300  25
PR. GEORGE   P.G.     16   -2     750   9     23    2     850   9
SMITHERS     P.G.     26    0     800   7     27    1     800   7
WELLS GRAY   P.G.     10    0    1000  25     65    4    1300  25
FT NLSN      F.N.      9  -19     400   8      9  -14     400  10
FT STJOHN    F.N.      9   -2     700   9      9    0     700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   57   SW  67
SMITHERS              S   37   SW  67

TODAY'S VENTING: POOR LOCALLY GOOD

VENTING FOR WEDNESDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100  32     52   10     250  32
FRASER VLY   QUIL      9    7      50  32     43   10     200  32
SRN VRISL    QUIL     14    8     100   8     33   10     150  20
CNTRL VRISL  QUIL      9    6      50   8     12    6      50  15
NRN VRISL    HRDY    100    8    1100  20    100    9    1250  30
TERRACE      ANT       9    3     200  25      9    3     200  25
STEWART      ANT       9    2       0  13      9    3       0  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   35   SW  50   SW  57
PORT HARDY   SW  24   SW  35   SW  48
SANDSPIT     SW  44   SW  48   SW  50

TODAY'S VENTING: FAIR TO POOR.

VENTING FOR WEDNESDAY: FAIR

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


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