FPCN39 CWLW 261456
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 PST SUNDAY 26 OCTOBER 1997 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      21    9     400  10     72   14    1600  15
KAMLOOPS     KEL      22    8     500  12     70   12    1600  15
OKANAGAN     KEL      13    7     500   6     56   12    1200  12
CASTLEGAR    SPOK     17    7     600   8     39   12    1200   8
CRANBROOK    SPOK     16    7    1050   8     48    9    1350  11
REVELSTOKE   KEL      16    7     600   7     30    8     500   8

*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    SW  11   SW  30   W   57
CRANBROOK             SW  22   SW  69

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          500 m         10 C
SPOKANE         1500 m         14 C

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR MONDAY: FAIR TO GOOD

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     12    6    1050   6     56    8    1100  33
PR. GEORGE   P.G.     23    7     750  15     65    8    1000  25
SMITHERS     P.G.     15    6     600   7     54    9     850  18
WELLS GRAY   P.G.     19    6    1050  10     66    9    1250  33
FT NLSN      F.N.      9    0     400   3     40    3     750  10
FT STJOHN    F.N.     45    7     800  15     67   10    1100  20

*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            W   46   W   61
SMITHERS              W   46   W   61

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         12 C
FT. NELSON      1000 m         15 C

TODAY'S VENTING: GOOD EXCEPT FAIR NE BC

VENTING FOR MONDAY: FAIR

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   10     100   6     38   12     250  15
FRASER VLY   QUIL     11   10     100   6     39   12     200  15
SRN VRISL    QUIL     10   10     100   6     39   12     200  15
CNTRL VRISL  QUIL     17   11     100  10     35   11     150  12
NRN VRISL    HRDY     16   10     150   8     47   10     400  12
TERRACE      ANT      13    8     150   7     53    9     900  12
STEWART      ANT      11    6     150   3     21    9      50   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   W   35   W   43
PORT HARDY   W   33   W   44   W   57
SANDSPIT     W   56   W   69   W   87

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       700 m         16 C
PORT HARDY       600 m         12 C
ANNETTE          200 m         10 C

TODAY'S VENTING: FAIR

VENTING FOR MONDAY: FAIR

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR

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


END/