FPCN39 CWLW 081408
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 8 SEPTEMBER 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      28   18     750   4     82   27    2150   7
KAMLOOPS     KEL      35   17     850   6     73   26    2000   7
OKANAGAN     KEL      22   16     700   4     68   24    1550   6
CASTLEGAR    KEL      42   16     950   9     92   24    2400  10
CRANBROOK    KEL      42   14    1250   5     87   22    2850   7
REVELSTOKE   KEL       9   11     500   5     69   22    1550   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   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1500 m         23 C
SPOKANE         MISSING      MISSING

TODAY'S VENTING: FAIR TO POOR THIS MORNING BECOMING BRIEFLY GOOD
LATE THIS AFTERNOON.


VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR BECOMING GOOD ON THURSDAY
AS A TROUGH MOVES THROUGH.


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   12     950  11     46   21    1450   9
PR. GEORGE   P.G.     17   11     800   6     36   20    1200   8
SMITHERS     P.G.     12   13     800   1     38   19    1050   4
WELLS GRAY   P.G.      9   12    1000  11    100   22    2950   9
FT NLSN      F.N.      9   13     400  13     33   18     600  13
FT STJOHN    F.N.      9   15     700  13    100   20    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   W   15
SMITHERS              SW   9   W   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m         21 C
FT. NELSON       600 m         21 C

TODAY'S VENTING: POOR THIS MORNING BECOMING FAIR TO GOOD
IN THE PEACE DISTRICT AND ABOVE 1000M IN THE CARIBOO.

VENTING FOR TUESDAY: FAIR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY:FAIR BECOMING GOOD ON THURSDAY
AS A WEAK TROUGH MOVES THROUGH.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     11   17     450   1     50   22     900   5
FRASER VLY   HRDY     12   19     600   1     66   27    1600   5
SRN VRISL    HRDY      9   16     250   0     42   23     950   4
CNTRL VRISL  HRDY     11   17     400   1     47   24    1150   4
NRN VRISL    HRDY      9   13     100   0     38   18     600   5
TERRACE      ANT      45   15     500  15     79   18    1250  15
STEWART      ANT       9   14       0   8     67   18    1000  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    NE  13   E   15   SE  11
PORT HARDY   VR   5   VR   5   SE   9
SANDSPIT     SW  19   SW  26   SW  28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      MISSING       MISSING
PORT HARDY      1700 m         28 C
ANNETTE         2800 m         17 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR TUESDAY: FAIR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY:FAIR BECOMING GOOD ON THURSDAY
AS A WEAK TROUGH MOVES THROUGH.

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


END/LM