FPCN39 CWLW 271350
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 SUNDAY 27 SEPTEMBER 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      34   15     750   5     62   24    1550   5
KAMLOOPS     KEL      32   14     850   5     68   24    2000   5
OKANAGAN     KEL      19   12     550   5     57   22    1550   5
CASTLEGAR    SPOK     25   13     750   6     55   21    1450   6
CRANBROOK    SPOK     25    8     900   5     50   19    1100   7
REVELSTOKE   KEL      13   10     500   5     42   17    1200   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   11   NW  22
CRANBROOK             NW   9   NW  20

TODAY'S VENTING: FAIR

VENTING FOR MONDAY: 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.     43   9     2000   5    100   16    3000  10
PR. GEORGE   F.N.     45   10    2050   8    100   16    3000  10
SMITHERS     ANT      35   11    1100   2    100   16    2100  10
WELLS GRAY   F.N.    100   10    2550   8    100   17    3000  11
FT NLSN      F.N.      9   11     400   6    100   16    2550  10
FT STJOHN    F.N.      9    9     700   6    100   15    2850  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              W   41   W

TODAY'S VENTING:GOOD

VENTING FOR MONDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     44   13     600   5     80   19    1200   8
FRASER VLY   HRDY     40   12     600   5     80   24    1250   7
SRN VRISL    HRDY     30   14     300   8     89   21    1050   6
CNTRL VRISL  HRDY     72   16     700   5    100   26    1350   7
NRN VRISL    HRDY     15   13     100   8     48   15     500  10
TERRACE      ANT      90   14    1100   6    100   19    2100  15
STEWART      ANT      77   15     850  12    100   19    1850  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  11   NW  22   NW  28
PORT HARDY   NW  17   W   31   W   48
SANDSPIT     W   30   W   39   W   54

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

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


END/LM