FPCN39 CWLW 051439
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 5 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      13    9     550   2     27   11     900   3
KAMLOOPS     KEL      32    9     850   8     30   11    1100   3
OKANAGAN     KEL       9    7     350   2     30   11    1100   3
CASTLEGAR    SPOK     25    7     850   5     36   11    1050   6
CRANBROOK    SPOK     14    6    1000   8     36   11    1300   8
REVELSTOKE   KEL       9    6     450   1     14    7     700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  24   SW  50
CRANBROOK             W   17   W   54

TODAY'S VENTING: Poor to fair.

VENTING FOR THURSDAY: 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.     10    8     950  24    100    9    1300  24
PR. GEORGE   P.G.      9    8     700  15     46    9     950  17
SMITHERS     P.G.      9    4     500   5      9    6     500   5
WELLS GRAY   P.G.      9    5    1000  23    100   10    2050  23
FT NLSN      F.N.      9   -1     400  15      9    4     400  15
FT STJOHN    F.N.      9    5     700  22     10    7     700  22

*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            W   28   W   46
SMITHERS              NW  20   NW  46

TODAY'S VENTING: Fair to good.

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     13   12     100  11     17   14     150  11
FRASER VLY   QUIL     15   12     100  11     19   14     150  11
SRN VRISL    QUIL     15   12     100   8     21   14     150  10
CNTRL VRISL  QUIL     15   12     100   8     18   13     150  10
NRN VRISL    HRDY     18   11     150   8     18   11     150   8
TERRACE      ANT       9    7     250   9     78    8    1100  12
STEWART      ANT      29    9     550   4     10    8     100   1

*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   20   SW  35   SW  43
PORT HARDY   N   20   NW  11   SW  24
SANDSPIT     N   22   NW  22   NW  24

TODAY'S VENTING: Poor.

VENTING FOR THURSDAY: Poor.

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


END/DB