FPCN39 CWLW 131432
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 13 June 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      50   20     600  15     80   26    1250  15
KAMLOOPS     KEL      49   21    1000   8     80   27    2000   8
OKANAGAN     KEL      37   20     900   6     80   27    2000   8
CASTLEGAR    SPOK     32   17     950   6     76   24    1900   7
CRANBROOK    SPOK     57   18    1700   8    100   23    3950   8
REVELSTOKE   KEL      13   18     650   2     92   25    2300   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   N   19   N   22
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1150 m         23 C
SPOKANE         1850 m         23 C

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON DUE TO AN UNSTABLE
AIRMASS.

VENTING FOR SATURDAY: FAIR TO GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR TO GOOD FOR A FEW HOURS
DURING THE AFTERNOON.




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.    100   17    3950  14    100   22    3950  14
PR. GEORGE   P.G.     90   17    1350  21    100   22    3700  15
SMITHERS     P.G.      9   15     500   5    100   20    3500  14
WELLS GRAY   P.G.    100   18    4000  14    100   23    4000  14
FT NLSN      F.N.    100   18    1200  25    100   24    3400  20
FT STJOHN    F.N.    100   17    1700  25    100   23    3700  20

*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            W   19   W   20
SMITHERS              W   15   W   20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1250 m         19 C
FT. NELSON       800 m         17 C

TODAY'S VENTING: GOOD THIS AFTERNOON DUE TO AN UNSTABLE AIRMASS
AND GUSTY WINDS.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD DURING THE AFTERNOONS.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     55   17     900   8     65   20    1000   8
FRASER VLY   QUIL     55   18     950   8     65   22    1000   8
SRN VRISL    QUIL     52   16     800   7     65   20    1000   8
CNTRL VRISL  QUIL     55   17     900   8     65   21    1000   8
NRN VRISL    HRDY     20   14     250   5     46   17     800   6
TERRACE      ANT      70   15    1650   6     88   19    2300   6
STEWART      ANT      61   15    1050   7     86   19    2050   6

*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   20   NW  19   NW  15
PORT HARDY   NW  13   NW  20   NW  26
SANDSPIT     SW  26   SW  28   SW  37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         14 C
PORT HARDY      2000 m         26 C
ANNETTE         NONE           ## C

TODAY'S VENTING: GOOD IN THE NORTH DUE TO AN UNSTABLE AIRMASS AT
LOW LEVELS. IN THE SOUTH VENTING WILL STRUGGLE TO REACH THE GOOD
CATEGORY DUE TO AN ELEVATED TEMPERATURE INVERSION.

VENTING FOR SATURDAY: FAIR.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD IN THE NORTH. FAIR IN
THE SOUTH.


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

END/JDG