FPCN39 CWLW 161433
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 16 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      81   22    1450   9    100   27    3200   8
KAMLOOPS     KEL      66   20    1200   9    100   26    3350   8
OKANAGAN     KEL      66   20    1200   9    100   26    3350   8
CASTLEGAR    SPOK     41   18     850  11     97   25    1650  14
CRANBROOK    SPOK      9   19     950  16    100   26    3950  21
REVELSTOKE   KEL      24   18     650   8    100   23    3450   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   W   19
CRANBROOK             W   11   W   28

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          650 m         19 C
SPOKANE         1200 m         23 C

TODAY'S VENTING: BECOMING GOOD NEAR MID MORNING AS THE AIRMASS
REMAINS UNSTABLE ENOUGH AT LOW LEVELS.

VENTING FOR TUESDAY: FAIR TO GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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.    100   14    2700  17    100   22    3950   8
PR. GEORGE   P.G.    100   15    2350  19    100   22    3700   8
SMITHERS     P.G.      9   11     500   3    100   19    2900   8
WELLS GRAY   P.G.    100   14    2850  17    100   22    4000   8
FT NLSN      F.N.     50   14     500  12    100   20    3000   8
FT STJOHN    F.N.     95   15    1200  15    100   20    2400  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  17   SW  24
SMITHERS              S    9   S   24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1300 m         15 C
FT. NELSON      MISSING

TODAY'S VENTING: BECOMING GOOD NEAR MID MORNING AS THE AIRMASS
REMAINS UNSTABLE ENOUGH AT LOW LEVELS.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: CONTINUING GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     50   17     900   8     50   20     800   9
FRASER VLY   QUIL     50   17     850   8     50   20    1000   6
SRN VRISL    QUIL     33   16     500   5     50   20     800  10
CNTRL VRISL  QUIL     48   17     800   6     50   20     900   7
NRN VRISL    HRDY     33   13     400   7     60   16     700  15
TERRACE      ANT      69   12    1150   9     77   15    1450   8
STEWART      ANT      65   13    1000   8     73   15    1200   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   17   SW  26   SW  33
PORT HARDY   S   44   S   54   S   56
SANDSPIT     SE  52   SE  57   S   57

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2100 m         28 C
PORT HARDY      1500 m         21 C
ANNETTE          100 m         15 C

TODAY'S VENTING: FAIR ON THE SOUTH COAST DUE TO AN ELEVATED
INVERSION. GOOD ON THE NORTH COAST AS THE AIRMASS REMAINS
UNSTABLE ENOUGH AT LOW LEVELS.

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: CONTINUING GOOD.




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

END/JDG