FPCN39 CWLW 291322
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 TUESDAY 29 SEPTEMBER 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   15     550   1     41   23    1550   3
KAMLOOPS     KEL      11   12     500   1     41   22    1750   3
OKANAGAN     KEL      11   14     550   1     45   23    2000   3
CASTLEGAR    SPOK      9   13     750   0     13   20     900   1
CRANBROOK    SPOK      9   13     990   1     71   21    2050   8
REVELSTOKE   KEL      10   11     500   1     23   16     850   4

*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    VR   5   NW  15   NW  31
CRANBROOK             VR   5   NW  17

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR WEDNESDAY: POOR TO 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    7     950   4     50   15    3950  11
PR. GEORGE   P.G.     10    6     800   1     45   14    2300   6
SMITHERS     P.G.     12    6     800   1     34   12     950   4
WELLS GRAY   P.G.      9    7    1000   4     50   15    4000  11
FT NLSN      F.N.     32    5     550  14     80   12    3400   9
FT STJOHN    F.N.     60    5    1150  14     80   12    3700   8

*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
SMITHERS              SW  28   SW

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     26   13     350   6     33   17     750   6
FRASER VLY   QUIL     26   13     350   6     33   21    1100   5
SRN VRISL    QUIL     15   13     350   2     33   19     850   4
CNTRL VRISL  QUIL     15   12     300   2     28   22    1150   4
NRN VRISL    HRDY      9   10       0  10     43   15     750  10
TERRACE      ANT      85    9     800  21    100   13    1300  20
STEWART      ANT       9    9       0   6    100   13    1050  17

*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    NW   9   NW  22   W   31
PORT HARDY   VR   5   W   28   W   39
SANDSPIT     SW  57   SW  61   SW  74

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR WEDNESDAY: POOR TO GOOD.




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


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