FPCN39 CWLW 221507
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 SATURDAY 22 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    1     200   4     41    5     900   5
KAMLOOPS     KEL       9    3     550   6     34    5     900   6
OKANAGAN     KEL       9    2     350   4     34    5     900   5
CASTLEGAR    SPOK     20    3     750   4     34    6     950   6
CRANBROOK    SPOK      9    1     950   6     24    6    1200   6
REVELSTOKE   KEL       9    3     700   4     34    5    1000   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE   9   SE  20   S   33
CRANBROOK             VR   5   W    9

TODAY'S VENTING: FAIR TO POOR

VENTING FOR SUNDAY: POOR

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   -2     950   4      9    0     950   8
PR. GEORGE   P.G.      9   -1     700   5     16    1     850   5
SMITHERS     P.G.     11   -1     600   2     12    0     650   2
WELLS GRAY   P.G.      9   -1    1000   8      9    0    1000   8
FT NLSN      F.N.      9   -6     400   7      9   -4     400   8
FT STJOHN    F.N.      9   -4     700   7      9   -2     700   8

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  35   S   26
SMITHERS              SE  46   S   26

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     17    6     150  10     26    9     250  10
FRASER VLY   QUIL     22    7     200  10     30   10     300  10
SRN VRISL    QUIL     26    8     200   9     30   10     300   9
CNTRL VRISL  QUIL     18    6     150   9     22    7     200   9
NRN VRISL    HRDY     79    8     550  20     82   10     600  20
TERRACE      ANT       9    2     250  10      9    3     250  13
STEWART      ANT       9    5       0  11      9    3       0  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  50   SE  54   S   48
PORT HARDY   SE  82   S   82   S   56
SANDSPIT     SE  80   SE  78   S   65

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: POOR

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


END/MWSO