FPCN39 CWLW 101424
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT WEDNESDAY 10 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      25   15     900   8     31   28    1100   3
KAMLOOPS     KEL      25   15     900   5     29   27    1200   3
OKANAGAN     KEL      25   15     900   5     29   27    1200   3
CASTLEGAR    SPOK     25   15     900   5     31   25    1000   5
CRANBROOK    SPOK     15   12    1100   5     15   25    1500   1
REVELSTOKE   KEL      25   15    1100   5     23   23    1000   3

*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  11   SW  22
CRANBROOK             VR   5   W   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2300 m         31 C
SPOKANE         2500 m         32 C

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: 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.     20   10    1100   6     50   23    1950  12
PR. GEORGE   P.G.     20   10    1100   6     52   22    1900   8
SMITHERS     P.G.     20   11    1100   6     55   20    2150   4
WELLS GRAY   P.G.     20   10    1100   6     55   24    2200  12
FT NLSN      F.N.     20   10    1100   6     71   19    2550   8
FT STJOHN    F.N.     20   11    1100   6     70   21    2700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  11   SW  28
SMITHERS              W    9   SW  28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         21 C
FT. NELSON       900 m         17 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15   18     600   5     51   21    1750   7
FRASER VLY   QUIL     15   18     600   5     51   25    1800   7
SRN VRISL    QUIL     30   15     600   5     67   22    1750   8
CNTRL VRISL  QUIL     10   15     600   5     48   24    1750   5
NRN VRISL    HRDY     20   15     700   5     49   17    1650  10
TERRACE      ANT      40   15     900   5     60   10    2050  10
STEWART      ANT      10   15     200   5     59   10    2050  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   11   SW  15   SW  17
PORT HARDY   NW  13   SW  15   SW  30
SANDSPIT     NW  19   NW  20   W   20

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1200 m         28 C
PORT HARDY      1600 m         28 C
ANNETTE          900 m         15 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD.




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


END/JMS