FPCN39 CWLW 301431
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 30 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      22   16     650   3    100   23    2250  15
KAMLOOPS     KEL      55   18    1300   6    100   24    3350   7
OKANAGAN     KEL      31   16     900   4    100   24    3350   7
CASTLEGAR    SPOK     22   16    1000   3    100   20    3000   5
CRANBROOK    SPOK     19   13    1050   9     89   18    2900   7
REVELSTOKE   KEL      41   16    1100   6    100   21    3450   7

*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   VR   5   VR   5
CRANBROOK             VR   5   E    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          850 m         17 C
SPOKANE         1100 m         17 C

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

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD BECOMING FAIR BY
FRIDAY.




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.      9   14     950   1     72   22    3950   3
PR. GEORGE   P.G.     25   14     850  10     85   22    3700   4
SMITHERS     P.G.     29   15     850   7    100   21    3500   7
WELLS GRAY   P.G.      9   14    1000   1     72   21    4000   3
FT NLSN      F.N.     68   14     750  23    100   18    2050  19
FT STJOHN    F.N.    100   13    1450  23    100   18    3700  19

*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            VR   5   VR   5
SMITHERS              W   15   W    5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         21 C
FT. NELSON       750 m         15 C

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

VENTING FOR TUESDAY: GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD THROUGH THURSDAY. FAIR
ON FRIDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     27   15     550   4    100   19    3000   4
FRASER VLY   QUIL     26   15     500   4    100   20    3000   4
SRN VRISL    QUIL     31   16     650   4    100   19    3000   4
CNTRL VRISL  QUIL     42   17     950   4    100   20    3000   4
NRN VRISL    HRDY     42   14     600   6     50   17    1000   5
TERRACE      ANT      25   18    1050   2     46   23    1950   3
STEWART      ANT      21   17     450   3     40   23    1550   2

*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    W   15   W   11   VR   5
PORT HARDY   W   15   W   11   VR   5
SANDSPIT     W   17   NW  13   NW  11

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       250 m         15 C
PORT HARDY      1100 m         21 C
ANNETTE         1800 m         25 C

TODAY'S VENTING: GOOD THIS AFTERNOON ON THE SOUTH COAST DUE
TO AN UNSTABLE AIRMASS. THE AIRMASS IS MORE STABLE TO THE NORTH
SO VENTING WILL ONLY BE FAIR.

VENTING FOR TUESDAY: FAIR TO GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR TO GOOD WEDNESDAY.
POOR TO FAIR THURSDAY AND FRIDAY DUE TO A RIDGE OF HIGH PRESSURE.




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

END/JDG