FPCN39 CWLW 171448 CCA
CORRECTED 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 17 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   3     71   15    2650   6
KAMLOOPS     KEL      13    9     450   3     68   14    2750   6
OKANAGAN     KEL      13    9     450   3     68   13    2600   6
CASTLEGAR    SPOK     16    7     850   2     79   10    2000   2
CRANBROOK    SPOK      9    4     950  10     72    9    1950   9
REVELSTOKE   KEL       9    6     450   3     81    9    2500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   31   W   56
CRANBROOK             W   15   W   52

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.     10    5     950  22    100    9    2400  24
PR. GEORGE   P.G.      9    6     700  14     84    9    2500  15
SMITHERS     P.G.      9    2     500  14     79    6    2550  15
WELLS GRAY   P.G.     10    5    1000  22    100    9    2550  23
FT NLSN      F.N.      9    2     400  20     80    5    2400  29
FT STJOHN    F.N.     87    5    1050  20    100    9    2200  30

*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            W   44   W   54
SMITHERS              W   41   W   54

TODAY'S VENTING:  GOOD

VENTING FOR SUNDAY: FAIR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100  19     82   13    2350  16
FRASER VLY   QUIL      9   10      50  19     81   13    2350  16
SRN VRISL    QUIL      9   11       0   9     86   14    2400  15
CNTRL VRISL  QUIL      9   10      50   9     88   12    2150  15
NRN VRISL    HRDY      9    9       0   4     74   11    2800  15
TERRACE      ANT       9    6     200   5     83    8    2150  15
STEWART      ANT      10    7     100   2     86    8    2550  15

*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    NW  30   NW  31   NW  37
PORT HARDY   W   20   W   30   W   37
SANDSPIT     W   44   W   48   W   48

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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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