FPCN39 CWLW 051321
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 MONDAY 5 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       9   10     200   2    100   17    1900  11
KAMLOOPS     KEL      22   11     600   5    100   17    2000  11
OKANAGAN     KEL      48   12    1050   7    100   17    2000  11
CASTLEGAR    SPOK     24   10     800   5     97   15    2050  11
CRANBROOK    SPOK      9    7     950  13    100   14    2650  13
REVELSTOKE   KEL      10    9     500   2     83   13    1800   9

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   W   33
CRANBROOK             NW  13   NW  39

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.    100    8    1400  36    100   14    3950  34
PR. GEORGE   P.G.     82    8    1200  23    100   12    1800  27
SMITHERS     P.G.      9    6     500  11    100   10    1200  26
WELLS GRAY   P.G.    100    9    1800  35    100   13    4000  34
FT NLSN      F.N.     21    3     550   7     72    9    1450   9
FT STJOHN    F.N.     59    6    1450   9     81   12    2500   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  76   SW

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   13     100  18    100   17    1100  26
FRASER VLY   QUIL      9   12      50  18    100   16    1050  26
SRN VRISL    QUIL      9   13       0   6    100   17    1050  23
CNTRL VRISL  QUIL      9   12       0  10    100   16    1000  23
NRN VRISL    HRDY      9   11       0   8     36   14     350  10
TERRACE      ANT      10    8     250  12     62   12     800  12
STEWART      ANT       9   10       0   8     38   12     350   9

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   SW  30   W   41
PORT HARDY   S   46   S   57   SW  67
SANDSPIT     SW  70   SW  83   SW  98

TODAY'S VENTING: GOOD


VENTING FOR TUESDAY: GOOD




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


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