FPCN39 CWLW 061320
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 6 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      19   22     500   3     64   34    1950   4
KAMLOOPS     KEL      14   19     500   3     58   32    1850   4
OKANAGAN     KEL      14   19     500   3     58   32    1850   4
CASTLEGAR    SPOK     17   20     750   3    100   32    3500  11
CRANBROOK    SPOK      9   13     950   7    100   32    3950  13
REVELSTOKE   KEL      11   18     500   3     35   29    1350   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  28
CRANBROOK             SW   9   SW  19

TODAY'S VENTING: FAIR TO 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.      9   14     950  15    100   24    2350  21
PR. GEORGE   P.G.      9   14     700   2     70   22    1100   3
SMITHERS     P.G.      9   10     500   2     69   16     550   2
WELLS GRAY   P.G.      9   15    1000  15    100   24    2550  21
FT NLSN      F.N.      9    9     400  30     65   15     650  30
FT STJOHN    F.N.      9   10     700  29    100   19    3700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  48   SW

TODAY'S VENTING: GOOD


VENTING FOR MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   17     550   5     46   24    1200   7
FRASER VLY   QUIL     31   18     600   5     48   27    1450   7
SRN VRISL    QUIL     15   14     200   4     60   23    1100   6
CNTRL VRISL  QUIL     28   17     550   4     41   29    1650   9
NRN VRISL    HRDY      9   13       0   6     86   16     150   6
TERRACE      ANT     100   14    1150  38    100   17    1450  44
STEWART      ANT      89   14     550  25    100   17    1250  38

*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    S   11   SW  30   SW  46
PORT HARDY   S   63   SW  63   SW  70
SANDSPIT     S   56   SW  67   SW  74

TODAY'S VENTING: FAIR TO GOOD.


VENTING FOR MONDAY: GOOD




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


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