FPCN39 CWLW 061434
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 Sunday 6 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      31   21     900   3    100   26    3200  12
KAMLOOPS     KEL      21   19     750   3    100   25    3350  12
OKANAGAN     KEL      17   17     600   3    100   22    3350  12
CASTLEGAR    SPOK     63   19    1050  13    100   24    2300  16
CRANBROOK    SPOK    100   20    2500  19    100   27    3950  19
REVELSTOKE   KEL      14   16     600   3    100   20    3450  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   24   W   30
CRANBROOK             W   11   W   37

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          750 m         19 C
SPOKANE         1450 m         20 C

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

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: CONTINUING 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.     83   15    1600  18    100   18    3950  19
PR. GEORGE   P.G.     77   16    1400  14    100   20    3700  17
SMITHERS     P.G.     55   15    1150   9     84   18    1450  13
WELLS GRAY   P.G.    100   17    4000  19    100   20    4000  19
FT NLSN      F.N.     10   20     500   1    100   25    3500   5
FT ST JOHN   F.N.      9   18     700   2    100   21    2000  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   33   W   41
SMITHERS              W   24   W   41

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       750 m         15 C
FT. NELSON       600 m         23 C

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

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: CONTINUING GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     65   17     700  12     84   19    1100  12
FRASER VLY   QUIL     64   17     650  12     83   19    1050  12
SRN VRISL    QUIL     54   17     600  10     86   20    1150  11
CNTRL VRISL  QUIL     71   18     800  11     90   21    1350  11
NRN VRISL    HRDY      9   12       0   3     55   16     950   6
TERRACE      ANT     100   16    1750  14    100   20    2650  13
STEWART      ANT      46   14     450  10    100   20    2150  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   W   20   W   28
PORT HARDY   SW  20   S   24   SW  26
SANDSPIT     S   33   S   30   S   26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NONE           ## C
PORT HARDY       150 m         14 C
ANNETTE          100 m         13 C

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

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: CONTINUING GOOD.




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

END/JDG