FPCN39 CWLW 051406
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT FRIDAY 5 JUNE 1998 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      72   17    1200   9    100   25    3200  10
KAMLOOPS     KEL      62   15    1150   9    100   25    3350  10
OKANAGAN     KEL      62   15    1150   9    100   22    3350  10
CASTLEGAR    SPOK     62   15    1150   9    100   22    3350  10
CRANBROOK    SPOK     62   15    1150   9    100   22    3350  10
REVELSTOKE   KEL      41   13     900   8    100   19    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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   S    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         14 C
SPOKANE         MISSING

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.      9   11     950   6    100   21    3950  12
PR. GEORGE   P.G.      9   11     700   6     91   21    2400   8
SMITHERS     P.G.     18   15     800   3    100   24    2700   8
WELLS GRAY   P.G.      9   11    1000   6    100   22    4000  12
FT NLSN      F.N.      9   11    1000   6    100   22    4000  12
FT STJOHN    F.N.      9   11    1000   6    100   22    4000  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            NW  13   NW  17
SMITHERS              NW  19   NW  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         20 C
FT. NELSON      1200 m         21 C

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     27   15    1000   2     38   20    1250   3
FRASER VLY   QUIL     27   16    1050   2     39   21    1300   3
SRN VRISL    QUIL     20   14     850   1     24   19    1100   2
CNTRL VRISL  QUIL     23   15    1000   2     38   24    1500   2
NRN VRISL    HRDY     32   13     650   4     42   17     850   5
TERRACE      ANT      39   18     650   8    100   27    2500   8
STEWART      ANT      38   18     550   6     91   27    2050   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   N   13   NE  22
PORT HARDY   NW  15   N   13   N   15
SANDSPIT     N   30   N   20   N   19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1400 m         26 C
PORT HARDY      1400 m         27 C
ANNETTE          700 m         23 C

TODAY'S VENTING: fair to poor.

VENTING FOR SATURDAY: fair to poor.

VENTING OUTLOOK SUNDAY THRU TUESDAY: poor.

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


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