FPCN39 CWLW 041340
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 MONDAY 4 OCTOBER 1999 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       9   10     550   0     41   18    1150   4
KAMLOOPS     KEL       9    9     600   0     37   17    1200   4
OKANAGAN     KEL       9    9     600   0     43   18    1450   4
CASTLEGAR    SPOK     24    9     800   5     34   16    1000   5
CRANBROOK    SPOK      9    7     950   5     35   16    1450   5
REVELSTOKE   KEL       9    7     500   0     31   14    1050   4

*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    9   SW  20
CRANBROOK             W    9   W   26

TODAY'S VENTING: POOR BECOMING FAIR THIS AFTERNOON EXCEPT REMAINING
POOR THROUGH LOWER ELEVATION EASTERN VALLEYS.




VENTING FOR TUESDAY: FAIR

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    6     950   4     75   15    1500   8
PR. GEORGE   P.G.     32    8     900   3     60   14    1400   7
SMITHERS     P.G.     11    5     700   1     50   10    1600   4
WELLS GRAY   P.G.     10    3     800   2     70   14    1500   8
FT NLSN      F.N.      9    1     400   7     58    6     800  10
FT STJOHN    F.N.     60    8    1100   8     90   11    1900  11

*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   17
SMITHERS              S   11   SW  17

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



VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     13   11     200   3     15   15     300   3
FRASER VLY   QUIL     14   13     250   3     62   21     950   8
SRN VRISL    QUIL     12   11     200   2     28   18     450   5
CNTRL VRISL  QUIL     12   12     200   2     32   19     550   5
NRN VRISL    HRDY     36   11     800   4     41   13     850   4
TERRACE      ANT      10    9     250  16    100   12    1050  18
STEWART      ANT      32   10     250  11     75   12     650  16

*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  17   S   24   S   28
PORT HARDY   SE  15   S   28   S   26
SANDSPIT     S   28   S   35   S   37

TODAY'S VENTING: GENERALLY POOR THIS MORNING BECOMING BRIEFLY GOOD
THIS AFTERNOON THROUGH THE FRASER VALLEY WITH HEATING. GOOD THIS
AFTERNOON IN THE NORTH.




VENTING FOR TUESDAY: FAIR




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

END/TCS