FPCN39 CWLW 271430
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 Friday 27 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      15   17     800   1     89   21    2350   9
KAMLOOPS     KEL      16   17    1050   1     86   23    3350   9
OKANAGAN     KEL      13   15     750   1     86   23    3350   9
CASTLEGAR    SPOK     25   14     750   6    100   22    3500  11
CRANBROOK    SPOK      9   14     950   7    100   20    3950  13
REVELSTOKE   KEL      11   13     650   1     88   19    2500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   19   SW  24
CRANBROOK             SW   9   SW  24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 m         15 C
SPOKANE          800 m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.     88   11    1800  15     90   18    3950  11
PR. GEORGE   P.G.     14   11     750   7     90   16    2850  12
SMITHERS     P.G.     12   11     650   2     87   14    2250   8
WELLS GRAY   P.G.     99   11    2050  16     90   18    4000  11
FT NLSN      F.N.    100   10    1750  17     90   15    2200  12
FT STJOHN    F.N.    100   10    2050  16     90   14    2600  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   33   W   48
SMITHERS              W   20   N   48

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       800 m         13 C
FT. NELSON      NO INVERSION

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     55   15     900   7    100   19    2150  10
FRASER VLY   QUIL     71   16    1150   8    100   21    2550  11
SRN VRISL    QUIL     35   15     700   4     99   18    1850   9
CNTRL VRISL  QUIL      9   13     150   0     96   15    1750   9
NRN VRISL    HRDY     30   13     450   6     73   16    1350   7
TERRACE      ANT      53   13     800   9    100   16    3200  12
STEWART      ANT      21   13     250   6     88   16     950   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   SW  20   SW  26
PORT HARDY   SW  15   SW  15   SW  13
SANDSPIT     SW  17   NW   9   N   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY       500 m         13 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

VENTING OUTLOOK SUNDAY THRU TUESDAY: GOOD.




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

END/JMS