FPCN39 CWLW 111333
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 11 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      20    8     450   4     66   14    1400   6
KAMLOOPS     KEL      19    8     600   4     67   13    1500   7
OKANAGAN     KEL      19    8     600   4    100   14    2300   9
CASTLEGAR    SPOK     33    8     950   6     94   14    2400   8
CRANBROOK    SPOK     37    6    1250  10    100   12    3950  10
REVELSTOKE   KEL      28    8     750   6     46   10    1150   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   28   S   48
CRANBROOK             VR   5   S   22

TODAY'S VENTING: 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.     12    1     940   1     64   7     1800   5
PR. GEORGE   P.G.     12    1    1000   1     19    6    1750   1
SMITHERS     P.G.     13    2     900   1     16    6    1200   1
WELLS GRAY   P.G.      9   -1    1000   2     60    5    1400   5
FT NLSN      F.N.      9   -1     400  10     56    2     950  10
FT STJOHN    F.N.     79    0    1650  12     92    1    1900  12

*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            SE  28   S   33
SMITHERS              E   35   SE  33

TODAY'S VENTING: FAIR

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     12    9     150   5     75   14     400  15
FRASER VLY   QUIL     15   10     200   5     50   14     400   9
SRN VRISL    QUIL     12    9     100   3     71   14     400  10
CNTRL VRISL  QUIL     16   11     200   4     58   13     350   7
NRN VRISL    HRDY     32   10     150  17     77   12     550  19
TERRACE      ANT      10    5     250   9     10   10     250   9
STEWART      ANT       9    9       0   4      9   10       0   4

*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    SE  48   S   54   S   54
PORT HARDY   SE  72   S   80   S   69
SANDSPIT     E   54   SE  54   SE  44

TODAY'S VENTING: FAIR

VENTING FOR MONDAY: GOOD


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


END/LM