FPCN39 CWLW 101431
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 Sunday 10 August 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     100   23    2050  10    100   28    3200  11
KAMLOOPS     KEL      95   20    1900  10    100   25    3350  11
OKANAGAN     KEL      43   18    1000   6    100   27    3350  11
CASTLEGAR    KEL      52   17    1200   7    100   24    3500  11
CRANBROOK    KEL      99   16    2150  14    100   22    3950  13
REVELSTOKE   KEL      62   18    1450   7    100   23    2450  11


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE  11   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1432 m         20 C
SPOKANE         1050 m         18 C

TODAY'S VENTING: GOOD.




VENTING FOR SUNDAY: GOOD




VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO 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.      9   12     950   3    100   22    3950   9
PR. GEORGE   P.G.     33   13     900  12    100   21    3700  10
SMITHERS     P.G.     40   15     950   9    100   22    2700   9
WELLS GRAY   P.G.     31   14    1600   4    100   22    4000   9
FT NLSN      F.N.      9   17     400  10    100   25    2800  12
FT STJOHN    F.N.      9   14     700  10    100   21    2550  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   N   15
SMITHERS              NW  15   N   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       915 m         19 C
FT. NELSON       700 m         23 C

TODAY'S VENTING: GOOD




VENTING FOR SUNDAY: GOOD




VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     40   18     150   5     80   27     900  10
FRASER VLY   QUIL     20   14     120   2     90   30    1500  10
SRN VRISL    QUIL     15   19     100   6     50   25     850   6
CNTRL VRISL  QUIL     38   23     550   6     98   31    2800   6
NRN VRISL    HRDY     15   16     200   3     29   22     550   4
TERRACE      ANT      57   20     650  14    100   27    2000  12
STEWART      ANT      17   18     150   6     97   27    1500  11


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NE  22   NE  24   E   17
PORT HARDY   N   19   NE  20   NE  26
SANDSPIT     N   30   N   26   N   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       792 m         25 C
PORT HARDY       762 m         NIL
ANNETTE          457 m         25 C

TODAY'S VENTING: POOR TO FAIR




VENTING FOR SUNDAY: POOR TO FAIR




VENTING OUTLOOK MONDAY THRU WEDNESDAY: POOR BECOMING FAIR TO GOOD BY
WEDNESDAY.




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

END/MW