FPCN39 CWLW 151518
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 WEDNESDAY 15 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      28   12     650   5     48   16    1150   5
KAMLOOPS     KEL      29   11     800   5     50   14    1100  10
OKANAGAN     KEL      17   10     600   3     40   14    1100   5
CASTLEGAR    SPOK     30   11     900   6     36   14    1000   6
CRANBROOK    SPOK      9    5     950   9     34   12    1250   9
REVELSTOKE   KEL      13    8     550   3     25   10     800   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  22   SW  44
CRANBROOK             W   11   W   39

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1100 m         15 C
SPOKANE          900 m         14 C

TODAY'S VENTING: FAIR.

VENTING FOR THURSDAY: FAIR.

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO 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.     42    7    1200  15     50   13    1350  15
PR. GEORGE   P.G.     44   10     950  10     50   12    1250  15
SMITHERS     P.G.     15    9     700  10     36   11     650  12
WELLS GRAY   P.G.     40    8    1350  15     60   11    1600  15
FT NLSN      F.N.     24   -3    1200   4     39    2    1250   4
FT STJOHN    F.N.     31    5    1300   4     56    9    1350  15

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  61   W   67
SMITHERS              SW  54   SW  67

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         16 C
FT. NELSON      1400 m         14 C

TODAY'S VENTING: FAIR.

VENTING FOR THURSDAY: FAIR

VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   13     100   8     50   15     350  12
FRASER VLY   QUIL      9   13     100   8     51   16     400  10
SRN VRISL    QUIL      9   13     100   8     50   15     450  10
CNTRL VRISL  QUIL      9   12      50   8     45   14     450   8
NRN VRISL    HRDY     36   13     300  12     58   14     300  20
TERRACE      ANT      17   10     350   8     54   11     500  15
STEWART      ANT       9    6     150   5     21    9     300  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   20   SW  43   SW  59
PORT HARDY   S   61   SW  61   SW  69
SANDSPIT     SW  50   SW  59   SW  70

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       700 m         19 C
PORT HARDY       400 m         15 C
ANNETTE         NO INVERSION

TODAY'S VENTING: FAIR.

VENTING FOR THURSDAY: FAIR


VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD.


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


END/MWSO