FPCN39 CWLW 181342
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 SUNDAY 18 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      24    6     700   3     59   11    1600   5
KAMLOOPS     KEL      20    5     750   3     73   11    2100   5
OKANAGAN     KEL      18    3     650   3     73   11    2050   5
CASTLEGAR    KEL      22    6     950   3    100   12    2750  11
CRANBROOK    KEL      59    4    1800   8    100   10    3950  15
REVELSTOKE   KEL      19    5     800   3     70   10    2050   5


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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   35
CRANBROOK             W   13   W   31

TODAY'S VENTING: POOR THIS MORNING THEN GOOD


VENTING FOR MONDAY: 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    1     950  19    100    7    3950  21
PR. GEORGE   P.G.     17    2     900   5     85    6    1600  14
SMITHERS     P.G.      9    2     750   0     83    7    1500  12
WELLS GRAY   P.G.     85    3    1600  21    100    7    4000  21
FT NLSN      F.N.      9    1     400  21    100    9    1300  20
FT STJOHN    F.N.      9    1     700  19    100    8    3700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  54   W   70
SMITHERS              SW  59   W   70

TODAY'S VENTING: POOR BECOMING FAIR TO GOOD THIS AFTERNOON.


VENTING FOR MONDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     44   10     600   8     91   14    1850   8
FRASER VLY   HRDY      9    9      50  10     88   14    1800   8
SRN VRISL    HRDY      9    8       0  10     94   15    1950   8
CNTRL VRISL  HRDY      9    8      50  10     95   15    1950   8
NRN VRISL    HRDY      9    7       0  10     56   11     800   8
TERRACE      ANT       9    6     200  37    100    9    1100  35
STEWART      ANT       9    6       0  16     27    9     150  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NW  15   W   30
PORT HARDY   SW  46   W   46   W   52
SANDSPIT     W   56   W   54   W   63

TODAY'S VENTING: POOR THIS MORNING RISING TO GOOD THIS AFTERNOON
EXCEPT REMAINING POOR IN THE STEWART AREA.

VENTING FOR MONDAY: GOOD


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


END/