FPCN39 CWLW 231432
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 23 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      17   15     600   2     90   20    3200  10
KAMLOOPS     KEL      64   15    1300   8     70   20    3350  10
OKANAGAN     KEL      64   15    1300   8     70   20    3350  10
CASTLEGAR    SPOK     56   12    1000  12     70   17    2050  10
CRANBROOK    SPOK     45   10    1200  16     80   15    3950  10
REVELSTOKE   KEL      17   13     700   4     80   16    3450  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
PENTICTON    W    9   W   20   NW  31
CRANBROOK             W   15   W   43

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m         13 C
SPOKANE         1000 m         12 C

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: 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.      9    9     950  19    100   18    3950  10
PR. GEORGE   P.G.     51   14    1000  17    100   19    2450  11
SMITHERS     P.G.     48   15     900  12    100   20    2200  11
WELLS GRAY   P.G.     67   13    1400  19    100   18    4000  10
FT NLSN      F.N.      9   19     400   2     88   27    3400   4
FT STJOHN    F.N.      9   13     700   2     57   19    2700   9

*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            N   24   NE  31
SMITHERS              VR   5   VR  31

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         15 C
FT. NELSON       600 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     91   15    1050  14    100   18    3100  10
FRASER VLY   QUIL     70   14     750  12    100   17    3050  10
SRN VRISL    QUIL     81   15     900  13    100   17    1400  10
CNTRL VRISL  QUIL     82   15     950  13    100   18    3050  10
NRN VRISL    HRDY     65   14     600  13     93   16    1100  10
TERRACE      ANT      19   20     650   3     84   27    3200   4
STEWART      ANT      42   19     450   8     72   27    1750   5

*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   30   W   33   NW  26
PORT HARDY   W   22   NW  17   NW  11
SANDSPIT     NW   9   VR   5   SE  13

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY      NO INVERSION
ANNETTE          900 m         20 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD



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

END/JMS