FPCN39 CWLW 271459
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 MONDAY 27 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      48   12     850  20     44   14    1050  20
KAMLOOPS     KEL      12    6     500   2     35   10     850   5
OKANAGAN     KEL      12    6     500   2     35   12     950   5
CASTLEGAR    SPOK     10    6     550   2     33    9     700   5
CRANBROOK    SPOK     10    5    1000   4     35    7    1200   5
REVELSTOKE   KEL      11    7     550   2     26    8     650   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   NW  39
CRANBROOK             W   15   NW  44

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         12 C
SPOKANE          MSG

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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.     19    1    1000   2     56    7    1400   8
PR. GEORGE   P.G.     16    4     800   2     55    7    1400   7
SMITHERS     P.G.     15    3     650   4     30    5     800   6
WELLS GRAY   P.G.     17    3    1100   8     58    7    1500  10
FT NLSN      F.N.     18    0     650   6     45    1     950  10
FT STJOHN    F.N.     28    4    1000  12     66    7    1400  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   43   W   59
SMITHERS              SW  48   W   59

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       600 m          6 C
FT. NELSON      NO INVERSION

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY:


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20   10     150   6     52   12     650   8
FRASER VLY   QUIL     28   11     200   6     50   12     550   8
SRN VRISL    QUIL      9    9     100   6     40   12     500   7
CNTRL VRISL  QUIL      9   10     150   4     40   11     400   7
NRN VRISL    HRDY      9    8     100   9     35   10     300  10
TERRACE      ANT      17    6     400   5     45    8    1850   7
STEWART      ANT      13    7     300   4     37    8    1200   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W   11   W   30
PORT HARDY   S   33   SW  41   SW  44
SANDSPIT     SW  43   SW  43   SW  37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m         12 C
PORT HARDY       150 m         10 C
ANNETTE          150 m          7 C

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR

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


END/MWSO