FPCN39 CWLW 311321
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 31 AUGUST 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      12   22     500   1    100   35    2650  11
KAMLOOPS     KEL      11   20     500   1    100   32    2200  11
OKANAGAN     KEL      11   20     500   1    100   33    2550  11
CASTLEGAR    SPOK     17   20     750   3     38   32    1450   4
CRANBROOK    SPOK      9   18     950   4     89   31    3950   5
REVELSTOKE   KEL      10   21     550   1    100   34    3450  10

*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   VR   5   SW  13
CRANBROOK             VR   5   W    9

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.      9   14     950   9    100   26    3950   8
PR. GEORGE   P.G.      9   14     800   0    100   25    3700   7
SMITHERS     P.G.      9   14     750   0     32   21    1050   5
WELLS GRAY   P.G.      9   14    1000   9    100   25    4000   8
FT NLSN      F.N.      9   11     400  10    100   20    2650  11
FT STJOHN    F.N.      9   11     700  10    100   21    3700  13

*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              S   35   SW

TODAY'S VENTING: GOOD EXCEPT POOR IN THE SMITHERS AREA




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     18   20     250   5     36   26     500   7
FRASER VLY   QUIL     20   21     300   5     82   30    1050  12
SRN VRISL    QUIL     18   20     250   4     48   28     600   8
CNTRL VRISL  QUIL     19   21     300   4     93   33    1450  11
NRN VRISL    HRDY     20   15     200   6     43   21     500   9
TERRACE      ANT      10   14     200  25    100   20    1300  30
STEWART      ANT       9   14       0   7    100   20     900  23

*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    NW   9   VR   5   W    9
PORT HARDY   S   15   SW  28   SW  39
SANDSPIT     SW  37   SW  54   SW  69

TODAY'S VENTING: FAIR VANCOUVER ISLAND AND LOWER MAINLAND. GOOD
ELSEWHERE.




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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