FPCN39 CWLW 051433
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 Friday 5 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      42   19     850  12     97   24    2500  18
KAMLOOPS     KEL      36   18     950   5     88   23    2600   6
OKANAGAN     KEL      33   17     800   6     88   24    2850   6
CASTLEGAR    SPOK     27   17     800   6     88   25    2500   6
CRANBROOK    SPOK      9   16     950   6    100   25    2600  15
REVELSTOKE   KEL      21   15     650   7     73   21    2450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   SW  19
CRANBROOK             VR   5   SW  26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1600 m         22 C
SPOKANE         1700 m         23 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.     22   13    1100   9    100   19    3350  10
PR. GEORGE   P.G.     23   13    1000   5     95   18    3400   6
SMITHERS     P.G.     14   11     850   2     95   17    3100   8
WELLS GRAY   P.G.      9   13    1000   9    100   18    3000  10
FT NLSN      F.N.      9   13     400   4     90   18    3450   6
FT STJOHN    F.N.     26   13    1000   6     91   19    3250   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW   9   SW  17
SMITHERS              S   13   S   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         18 C
FT. NELSON       600 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     74   18    1150   9    100   22    2250  10
FRASER VLY   QUIL     60   17     800   9    100   22    2200  10
SRN VRISL    QUIL      9   17     650   0    100   21    2200   9
CNTRL VRISL  QUIL      9   16     250   0    100   19    2250   5
NRN VRISL    HRDY     12   14     100   4    100   18    2200  12
TERRACE      ANT      10   13     250  11    100   18    2350  12
STEWART      ANT       9   14      50   0    100   18    2450  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   19   SW  24
PORT HARDY   SW  19   SW  22   SW  26
SANDSPIT     SW  19   SW  17   SW  17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         15 C
PORT HARDY       100 m         14 C
ANNETTE          100 m         14 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD.




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

END/JMS