FPCN39 CWLW 071528
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 FRIDAY 7 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       9    8     200   2     58   10     800  10
KAMLOOPS     KEL       9    8     350   2     53   10     800  12
OKANAGAN     KEL       9    9     350   2     45   10     800   9
CASTLEGAR    SPOK     21    9     800   4     24   10     900   4
CRANBROOK    SPOK      9    4     950   5      9    7     950   5
REVELSTOKE   KEL       9    6     450   2      9    7     450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE  13   E   15
CRANBROOK             E   13   E   31

TODAY'S VENTING: GOOD IN THE CANYON. FAIR TO POOR ELSEWHERE.

VENTING FOR SATURDAY: 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.     57    0    1350  14     62    5    1800   8
PR. GEORGE   P.G.     34   -1     950  12     58    3    1450   8
SMITHERS     P.G.     15   -1     800   3     53    1    1200   8
WELLS GRAY   P.G.     57    0    1450  14     76    4    1800  13
FT NLSN      F.N.      9   -1     400  18     27    4     500  18
FT STJOHN    F.N.      9   -3     700  28      9   -2     700  28

*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            E   33   E   26
SMITHERS              SE  46   E   26

TODAY'S VENTING: GOOD AT HIGHER ELEVATIONS. FAIR TO POOR ELSEWHERE.

VENTING FOR SATURDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21   11     400   4     44   13     950   5
FRASER VLY   QUIL     19   11     300   4     43   13     900   5
SRN VRISL    QUIL     28   12     550   4     39   13     850   4
CNTRL VRISL  QUIL     15   11     200   3     29   12     600   4
NRN VRISL    HRDY     19    9     300   4     27   11     600   4
TERRACE      ANT       9    2     200   8     59    4     600  17
STEWART      ANT      17    6     100   7     16    4     100   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   E   15   E   15
PORT HARDY   E   15   E   15   E   20
SANDSPIT     SE  26   SE  28   SE  24

TODAY'S VENTING: MAINLY POOR. LOCALLY GOOD IN SOME MAINLAND VALLEYS.

VENTING FOR SATURDAY: FAIR

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


END/PJS