FPCN39 CWLW 071433
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 7 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      21   18     700   3     94   24    2800   6
KAMLOOPS     KEL      26   17     900   3    100   24    3350   6
OKANAGAN     KEL      25   17     900   3    100   24    3350   6
CASTLEGAR    SPOK     11   16     850   1     91   24    3500   5
CRANBROOK    SPOK     10   14     950  10    100   21    3950   6
REVELSTOKE   KEL      32   17    1300   3    100   24    3450   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW   9   S   13
CRANBROOK             VR   5   SW  15

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         16 C
SPOKANE          900 m         17 C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE AT LOW LEVELS
SO THAT BY AFTERNOON GOOD VENTING CAN BE EXPECTED.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD DURING THE AFTERNOONS.




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.     67   12    2200   6    100   18    3950  10
PR. GEORGE   P.G.     25   10     800  13    100   19    3700  10
SMITHERS     P.G.     20   10     700   6     80   15    1800   9
WELLS GRAY   P.G.     95   13    2850   8    100   19    4000  10
FT NLSN      F.N.     24   15     650   6    100   23    3400   6
FT STJOHN    F.N.      9   13     700   8    100   19    3700   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  20   SW  28
SMITHERS              SW  22   SW  28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         14 C
FT. NELSON       800 m         21 C

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

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: REMAINING 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     89   16    1700   8    100   20    2700  10
FRASER VLY   QUIL     87   16    1650   8    100   20    2700  10
SRN VRISL    QUIL     70   15    1200   7    100   20    2650   9
CNTRL VRISL  QUIL     38   13     650   5     71   15    1250   7
NRN VRISL    HRDY     50   12     450  12    100   15    1750  21
TERRACE      ANT     100   10     800  33    100   14    1700  32
STEWART      ANT     100   12     750  26    100   14    1300  28

*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    W   13   SW  13   SW  17
PORT HARDY   SW  19   SW  22   SW  26
SANDSPIT     W   28   W   28   W   31

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         13 C
PORT HARDY       100 m         12 C
ANNETTE            NONE        ## C

TODAY'S VENTING: THE AIRMASS REMAINS UNSTABLE AT LOW LEVELS
SO THAT BY AFTERNOON GOOD VENTING CAN BE EXPECTED.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD DURING THE AFTERNOONS.




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

END/JDG