FPCN39 CWLW 021433
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 2 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      44   17    1100   5    100   23    3200   7
KAMLOOPS     KEL      74   17    1900   6    100   23    3350   7
OKANAGAN     KEL      24   15     800   3    100   23    3350   7
CASTLEGAR    SPOK     52   15    1150   8    100   21    3500  15
CRANBROOK    SPOK    100   14    2550  17    100   19    3950  16
REVELSTOKE   KEL      20   14     800   3    100   19    2850   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   S   11   S   19
CRANBROOK             VR   5   SW  20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m         14 C
SPOKANE         1200 m         14 C

TODAY'S VENTING: VENTING WILL BE GOOD BY LATE MORNING DUE TO AN
UNSTABLE AIRMASS.

VENTING FOR TUESDAY: FAIR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GENERALLY GOOD AS THE
AIRMASS BECOMES INCREASINGLY UNSTABLE.




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   12    2800  21    100   19    3950  21
PR. GEORGE   P.G.    100   13    2350  18    100   18    3700  20
SMITHERS     P.G.     22   13     800   4    100   17    3500  17
WELLS GRAY   P.G.    100   14    4000  21    100   20    4000  21
FT NLSN      F.N.      9   12     400   7     90   18    2100   8
FT STJOHN    F.N.     10   13     700   8    100   18    3700  10

*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              SW  17   SW  24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       800 m         13 C
FT. NELSON       650 m         16 C

TODAY'S VENTING: VENTING WILL BE GOOD BY LATE MORNING DUE TO AN
UNSTABLE AIRMASS.

VENTING FOR TUESDAY: FAIR TO GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GENERALLY GOOD AS THE
AIRMASS BECOMES INCREASINGLY UNSTABLE.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     40   15     700   6     40   18     700   6
FRASER VLY   QUIL     36   15     950   3     40   18    1150   3
SRN VRISL    QUIL     40   14     700   6     40   18     700   6
CNTRL VRISL  QUIL     40   13     700   6     40   15     700   6
NRN VRISL    HRDY     26   12     250   6     70   15    1200  10
TERRACE      ANT      54   11     700  12    100   15    2100  15
STEWART      ANT      45   12     450   9    100   15    1450  13

*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    SE   9   S   19   S   26
PORT HARDY   SE  26   SE  37   S   44
SANDSPIT     S   33   S   35   S   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2000 m         23 C
PORT HARDY       200 m         13 C
ANNETTE          500 m         14 C

TODAY'S VENTING: WARMING WILL TAKE PLACE ALOFT AHEAD OF AN
APPROACHING FRONTAL SYSTEM TODAY. AS A RESULT VENTING WILL BE
FAIR OVER SOUTHERN SECTIONS. NORTHERN SECTIONS WILL REMAIN
UNSTABLE ENOUGH FOR GOOD VENTING THIS AFTERNOON.

VENTING FOR TUESDAY: FAIR TO GOOD.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GENERALLY GOOD AS THE
AIRMASS BECOMES INCREASINGLY UNSTABLE.




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

END/JDG