FPCN39 CWLW 251428
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 PST TUESDAY 25 NOVEMBER 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    3     450   2     51    6     750   7

KAMLOOPS     KEL      12    2     500   2     51    5     800   7

OKANAGAN     KEL      12    2     500   2     55    6    1000   5

CASTLEGAR    SPOK      9    2     500   4     44    6     850   8

CRANBROOK    SPOK      9   -1     950  11     39    3     950  11

REVELSTOKE   KEL      14    3     700   2     46    4     800   6


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  30
CRANBROOK             W   11   W   39

TODAY'S VENTING: FAIR TO MARGINALLY GOOD

VENTING FOR WEDNESDAY: 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    0     950  10     93    4    2200  12

PR. GEORGE   P.G.     18    1     850   6     48    4    1250   8

SMITHERS     P.G.     13    0     650   3     40    2     750   5

WELLS GRAY   P.G.     60    2    1600  12    100    5    4000  13

FT NLSN      F.N.      9  -11     400  16      9   -7     400  16

FT STJOHN    F.N.      9    1     700  22    100    4    1600  25


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   35   W   52
SMITHERS              SW  30   SW  52

TODAY'S VENTING: GOOD AT HIGHER ELEVATIONS. POOR IN THE VALLEYS AND
IN THE FORT NELSON AREA.

VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     25    8     300   8    100   11    1300  17

FRASER VLY   QUIL     16    7     150   8     95   10    1050  16

SRN VRISL    QUIL     23    8     200   8     99   11    1200  15

CNTRL VRISL  QUIL      9    6      50   7     80    8     750   8

NRN VRISL    HRDY     23    6     350   5     60    8     850   8

TERRACE      ANT      10    2     250  15     98    5    1350  15

STEWART      ANT      11    4     100   2     59    5     500   2


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  20   S   24   SW  31
PORT HARDY   S   26   S   31   SW  39
SANDSPIT     SW  31   SW  39   SW  46

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

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


END/PJS