FPCN39 CWLW 161320
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 FRIDAY 16 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      13    8     550   1     52   14    1900   3

KAMLOOPS     KEL      11    7     600   1     68   15    2650   4

OKANAGAN     KEL      11    7     600   1     68   15    2650   4

CASTLEGAR    SPOK     19    7     900   3     64   12    2400   4

CRANBROOK    SPOK      9    4     950   4     64   10    2600   4

REVELSTOKE   KEL      10    6     550   1     34   10    1450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   11   W   17
CRANBROOK             VR   5   W   13

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: 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.     10    4     950  27    100   11    2950  22

PR. GEORGE   P.G.     23    3     850   8     82    9    1450  15

SMITHERS     P.G.     32    4     850   8     54    7    1050  11

WELLS GRAY   P.G.     61    5    1250  27    100   10    2950  22

FT NLSN      F.N.     36    2     650  12     65    7    1050  12

FT STJOHN    F.N.     29    2     900  12     97    8    2200  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  46   SW  44
SMITHERS              SW  57   SW  44

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19   10     300   5     42   13     900   5

FRASER VLY   QUIL      9    9      50   5     51   14    1100   5

SRN VRISL    QUIL     18   10     250   5     37   13     750   5

CNTRL VRISL  QUIL     18   10     250   5     49   14    1000   5

NRN VRISL    HRDY     87   10     500  26    100   12     900  23

TERRACE      ANT      10    7     200  26    100    9     750  33

STEWART      ANT       9    8       0  14     43    9     250  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   SW  22   W   30
PORT HARDY   S   59   S   63   SW  59
SANDSPIT     W   31   SW  50   SW  67

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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


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