FPCN39 CWLW 101327
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 10 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      54   10     950   7     93   15    2050   8
KAMLOOPS     KEL      55    9    1150   7     99   15    2350   8
OKANAGAN     KEL      65   10    1400   7     99   15    2350   8
CASTLEGAR    SPOK     20    9    1050   2     75   13    1900   7
CRANBROOK    SPOK     35    6    1250   9    100   12    3950  10
REVELSTOKE   KEL      32    7     800   7     76   11    1800   7

*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    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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     550   4     32    4    1200   5
PR. GEORGE   P.G.      9    1     700   3     28    5    1350   3
SMITHERS     P.G.      9    2     550   3     30    5    1250   3
WELLS GRAY   P.G.     11    0     500   5     35    3    1250   7
FT NLSN      F.N.     24   -1     500  15     55    1    1350   6
FT STJOHN    F.N.     54   -1    1400   8     55    1    1600   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   SW  13
SMITHERS              SE  13   S   13

TODAY'S VENTING: FAIR.

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     36   11     450   9    100   14    3100   8
FRASER VLY   QUIL     24   10     300   7    100   14    3050   8
SRN VRISL    QUIL     21   10     200   6     68   14    1300   6
CNTRL VRISL  QUIL     14    9     150   5     32   11     400   7
TERRACE      ANT      10    5     250  13     10    8     250   5
STEWART      ANT       9    7     100   5      9    8     100   5

*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    S    9   S   13   S   17
PORT HARDY   SE  19   SE  26   S   22
SANDSPIT     SE  30   SE  30   SE  28

TODAY'S VENTING: POOR EXCEPT GOOD SOUTH COAST.

VENTING FOR SUNDAY: GOOD

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


END/RWK