FPCN39 CWLW 151331
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 MONDAY 15 SEPTEMBER 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       9   15     200   2     97   17    1550  20
KAMLOOPS     KEL      12   15     500   2     94   18    1550  13
OKANAGAN     KEL      12   15     500   2     95   18    1500  13
CASTLEGAR    SPOK     34   14    1050   5     82   17    2000   8
CRANBROOK    SPOK     83   13    2050  10     99   16    2550  10
REVELSTOKE   KEL       9   13     450   2     11   15     550   2

*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   SW  17   SW  28
CRANBROOK             W   13   W   33

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m         17 C
SPOKANE         none

TODAY'S VENTING: generally good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: decreasing to poor.


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.     38   10    1300   9     91   12    2100  12
PR. GEORGE   P.G.      9    5     700   2     91   10    2100  12
SMITHERS     P.G.      9    8     500   1     91   10    2100  12
WELLS GRAY   P.G.     27    9    1200   9     84   11    2000  12
FT NLSN      F.N.     95    6    1500  14     95    9    1500  14
FT STJOHN    F.N.     42    3    1050  11     84    6    1500  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  22   W   22
SMITHERS              W   13   W   22

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         13 C
FT. NELSON      none

TODAY'S VENTING: good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: decreasing to fair.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     72   16    1100   9     81   18    1700   7
FRASER VLY   HRDY     75   17    1300   8     94   20    2150   7
SRN VRISL    HRDY     64   16     900   8     84   19    1800   7
CNTRL VRISL  HRDY     53   15     650   8     77   18    1550   7
NRN VRISL    HRDY     30   13     350   8     64   16     900   8
TERRACE      ANT       9   12     200   5     64   16     900   8
STEWART      ANT      10   13      50   1     64   16     900   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   13   SW  19   SW  17
PORT HARDY   SW  17   W   19   W   19
SANDSPIT     NW  22   NW  30   NW  30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       missing
PORT HARDY      1600 m         16 C
ANNETTE          300 m         19 C

TODAY'S VENTING: good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: decreasing to poor.


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


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