FPCN39 CWLW 061512
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 THURSDAY 6 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    9     200   1     35   11     950   8

KAMLOOPS     KEL      16    9     650   3     52   11    1150  10

OKANAGAN     KEL       9    8     350   1     20   11     750   3

CASTLEGAR    SPOK     17    8     750   3     21   10     850   4

CRANBROOK    SPOK      9    5     950  11     19   10     950  11

REVELSTOKE   KEL       9    7     450   1     19    8     650   3


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W   11
CRANBROOK             SW  11   W   35

TODAY'S VENTING: POOR TO FAIR

VENTING FOR FRIDAY: 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.     77    6    1900  11     80    7    1950  11

PR. GEORGE   P.G.     42    4    1000  13     66    6    1300  13

SMITHERS     P.G.      9    0     500   3     54    5    1100  10

WELLS GRAY   P.G.     72    5    1850  11     81    7    2050  11

FT NLSN      F.N.      9    0     400  10     19    4     400  10

FT STJOHN    F.N.      9    1     700  22     78    4    1150  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  28   NE  15
SMITHERS              NE  28   NE  15

TODAY'S VENTING: GOOD EXCEPT POOR IN THE NORTHEAST

VENTING FOR FRIDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20   13     200  10     50   14     400  16

FRASER VLY   QUIL      9   12      50  10     28   13     250  10

SRN VRISL    QUIL     24   12       0   8     29   13     500   8

CNTRL VRISL  QUIL      9   10      50   8     39   12     550   8

NRN VRISL    HRDY      9    9       0  10     61   10     600  11

TERRACE      ANT      10    3     200  15     56    7     950   8

STEWART      ANT      28    7     250   9     38    7     350   9


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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  11   S   11   S   20
PORT HARDY   NE  17   NE  15   NE  13
SANDSPIT     N   39   NE  28   N   20

TODAY'S VENTING: FAIR TO POOR EXCEPT GOOD ALONG THE CENTRAL AND NORTH
COAST

VENTING FOR FRIDAY: POOR

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

END/PJS