FPCN39 CWLW 191558
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 WEDNESDAY 19 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      26    4     500  10     45    6     800  10
KAMLOOPS     KEL      19    4     700   3     49    4    1400   6
OKANAGAN     KEL      12    1     500   2     49    5    1200   5
CASTLEGAR    SPOK     16    2     750   3     24    3     750   3
CRANBROOK    SPOK      9    0    1050   5     23    3     950   5
REVELSTOKE   KEL      16    3     700   3     41    4    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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  22   SW  61
CRANBROOK             S    9   SW  28

TODAY'S VENTING: FAIR LOCALLY GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.


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     980   4     29    0    1150  10
PR. GEORGE   P.G.     30   -2     900   4     32   -1     950  10
SMITHERS     P.G.      9   -2     500   4     22   -1     800   5
WELLS GRAY   P.G.     19   -1    1100   5     28    0    1200  10
FT NLSN      F.N.      9  -17     400   2     21  -14     450  12
FT STJOHN    F.N.     19  -10     800   2     26  -10     800  12

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   24   SE  19
SMITHERS              E   31   SE  19

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     16    7     200  10     65   11     300  25
FRASER VLY   QUIL     17    7     200  10     55   11     250  20
SRN VRISL    QUIL     19    9     200   7     64   11     250  25
CNTRL VRISL  QUIL     14    2     100   7     56   11     250  20
NRN VRISL    HRDY     14    4     100   7     62    9     300  20
TERRACE      ANT      26    1     200  20     52    2     300  20
STEWART      ANT      13    1     100   3     35    0     300   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   57   S   67   S   63
PORT HARDY   E   37   E   35   NE  19
SANDSPIT     NE  20   NE  22   NE  19

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.

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


END/