FPCN39 CWLW 141431
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 Monday 14 July 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      26   23     750   3     76   27    1850   6
KAMLOOPS     KEL      21   21     750   3     82   26    2050   7
OKANAGAN     KEL      18   20     650   3     82   26    2050   7
CASTLEGAR    SPOK     23   20     800   5     37   26    1150   5
CRANBROOK    SPOK      9   18     950   8     69   24    2050   8
REVELSTOKE   KEL       9   16     450   3     25   22     900   4

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   W   24
CRANBROOK             SW   9   W   22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         24 C
SPOKANE         1000 m         23 C

TODAY'S VENTING: fair to good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: generally 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.     92   17    1850  17    100   21    3950  17
PR. GEORGE   P.G.     39   17    1200   7    100   21    3700  15
SMITHERS     P.G.     23   16     800   6     72   20    1500   9
WELLS GRAY   P.G.     98   17    2000  17    100   22    4000  17
FT NLSN      F.N.      9   18     400  18     76   21     900  19
FT STJOHN    F.N.    100   19    1400  25    100   24    3700  31

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   20   W   28
SMITHERS              W   20   W   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         18 C
FT. NELSON       900 m         22 C

TODAY'S VENTING: good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: good.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     52   19     800   7     71   22    1250   8
FRASER VLY   QUIL     50   19     800   7     78   24    1450   8
SRN VRISL    QUIL     36   17     600   5     66   22    1200   7
CNTRL VRISL  QUIL     54   20     900   6     80   25    1550   7
NRN VRISL    HRDY      9   16       0   3     56   19    1200   7
TERRACE      ANT      45   17    1300   4     71   21    2100   5
STEWART      ANT      39   17     950   4     63   21    1650   4

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   SW  15   W   26
PORT HARDY   W   13   SW  17   SW  19
SANDSPIT     W   19   SW  19   SW  24

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       none
PORT HARDY      2000 m         19 C
ANNETTE          none

TODAY'S VENTING: good.

VENTING FOR TUESDAY: good.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: good.


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

END/dsl