FPCN39 CWLW 231434
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 Saturday 23 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      63   22    1550  15     76   26    2150  15
KAMLOOPS     KEL      15   22     800   1     61   27    2300   5
OKANAGAN     KEL      12   21     650   1     60   28    2450   5
CASTLEGAR    SPOK     25   21     750   7     59   29    2400   5
CRANBROOK    SPOK      9   19     950   4     70   27    3950   9
REVELSTOKE   KEL       9   17     500   1     68   22    2250   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  30
CRANBROOK             SW  13   SW  33

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         24 C
SPOKANE         1500 m         28 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     80   17    1850  12     80   23    3950  10
PR. GEORGE   P.G.     51   16    1100  12     80   22    3700  10
SMITHERS     P.G.     37   16     900   8     90   21    2800  11
WELLS GRAY   P.G.     88   17    2250  11     83   24    4000  10
FT NLSN      F.N.      9   15     400  13     77   20    2000  10
FT STJOHN    F.N.     16   15     750  10     75   19    2250   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   24   S   33
SMITHERS              S   30   S   33

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         19 C
FT. NELSON      1400 m         23 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     81   19     750  17     50   22    1650  12
FRASER VLY   QUIL     89   20     850  17     50   23    2000  10
SRN VRISL    QUIL     24   18     550   3     45   22    1400  12
CNTRL VRISL  QUIL     18   17     350   3     50   23    1800  10
NRN VRISL    HRDY      9   15     150   0     69   19    1650  12
TERRACE      ANT     100   16     800  36     80   19    2600  15
STEWART      ANT      43   15     250  16     80   19    2050  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   17   S   24   SW  41
PORT HARDY   S   50   S   59   S   57
SANDSPIT     S   80   S   82   S   83

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       800 m         19 C
PORT HARDY       400 m         16 C
ANNETTE          700 m         15 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SUNDAY: FAIR TO GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.



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

END/JMS