FPCN39 CWLW 161354
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 TUESDAY 16 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      23   15     550  18     90   18    2550  18
KAMLOOPS     KEL      19   14     600   4     70   18    2500  10
OKANAGAN     KEL      19   14     600   4     70   18    2500  10
CASTLEGAR    SPOK     94   13    1250   5     80   18    2500  10
CRANBROOK    SPOK    100   12    2000   5     83   17    2550  10
REVELSTOKE   KEL      12   12     500   4     91   15    2850  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   S   30
CRANBROOK             W   11   W   33

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          500 m         13 C
SPOKANE         1500 m         13 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD THURSDAY BECOMING
POOR FRIDAY.




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    6    1450   7     70   14    2950   8
PR. GEORGE   P.G.     36    9    1200   6     70   13    2300   8
SMITHERS     P.G.     20    8    1250   4     67   11    2300   6
WELLS GRAY   P.G.     70    8    1400   7     70   13    3000   9
FT NLSN      F.N.     33    7    1200   7     76   10    2950   8
FT STJOHN    F.N.     39    5    1450   8     77    8    2800   9

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  11   SW  19
SMITHERS              VR   5   VR  19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         10 C
FT. NELSON       800 m          5 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD THURSDAY BECOMING
POOR FRIDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41   15     400  11     70   18    2200  10
FRASER VLY   QUIL     37   15     350  11     70   18    2250  10
SRN VRISL    QUIL     17   14     250   4     73   17    2100  11
CNTRL VRISL  QUIL     11   12     100   3     76   17    1950   8
NRN VRISL    HRDY     16   13     250   3     58   15    1800   6
TERRACE      ANT      10   12     250  15     70   16    2100   8
STEWART      ANT       9   13       0   8     67   16    1950   9

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  46   SE  52   S   57
PORT HARDY   SE  63   SE  67   S   52
SANDSPIT     SE  56   SE  44   SE  31

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m         14 C
PORT HARDY       400 m         14 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD THURSDAY BECOMING
POOR FRIDAY.




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


END/JMS