FPCN39 CWLW 241324
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 PDT SATURDAY 24 OCTOBER 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      43    8     900   5     50   14    1300   5
KAMLOOPS     KEL      34    6     850   5     45   10    1100   6
OKANAGAN     KEL      40    7    1000   6     48   11    1200   6
CASTLEGAR    SPOK     19    7     750   4     26   10     850   5
CRANBROOK    SPOK     20    2    1050   2     29   14    1150  10
REVELSTOKE   KEL      29    5     850   5     38    8    1050   6

*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    SE   9   SE  24   SE  52
CRANBROOK             VR   5   S   13

TODAY'S VENTING: FAIR TO POOR




VENTING FOR SUNDAY: 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     950  23     40   12    1100  23
PR. GEORGE   P.G.     12    4     750   4     25   12     950   6
SMITHERS     P.G.     11    4     750   1     21   10     850   4
WELLS GRAY   P.G.      9    5    1000  23     41   12    1150  23
FT NLSN      F.N.     26    2     500  13     50    9     800  13
FT STJOHN    F.N.     23    6     800  13     52   14    1100  16

*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   31   S   31
SMITHERS              S   46   S   31

TODAY'S VENTING: POOR




VENTING FOR SUNDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100  17     24   14     150  17
FRASER VLY   QUIL     12   11     100   7     39   16     350  12
SRN VRISL    QUIL      9   10       0   7     19   14     150   7
CNTRL VRISL  QUIL      9    9      50   7     15   12     100   7
NRN VRISL    HRDY      9   10       0   6     14   14     100   6
TERRACE      ANT       9    5     200  28     10   11     250  28
STEWART      ANT       9    8       0  16      9   11       0  16

*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    SE  31   SE  31   S   35
PORT HARDY   SE  35   SE  35   S   19
SANDSPIT     SW  19   S   31   S   43

TODAY'S VENTING: POOR




VENTING FOR SUNDAY: FAIR




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


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