FPCN39 CWLW 261431
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 26 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      15    4     450   2     35    7    1000   2

KAMLOOPS     KEL      13    4     550   2     51    6    1250   4

OKANAGAN     KEL      12    3     500   2     47    5     850   2

CASTLEGAR    SPOK     34    3     900   7     48    4     950   7

CRANBROOK    SPOK      9   -1     950  14     31    3    1100  14

REVELSTOKE   KEL      17    4     850   2     30    6    1600   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   VR   5   W   19
CRANBROOK             VR   5   W   22

TODAY'S VENTING: 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.     50    1    1350  12     59    3    2150  11

PR. GEORGE   P.G.     20   -1     800  10     37    1    1000  10

SMITHERS     P.G.      9   -2     500   2     18    1     850   3

WELLS GRAY   P.G.     33    0    1200  12     97    3    2350  12

FT NLSN      F.N.     23   -8     450  16     33   -2     550  16

FT STJOHN    F.N.     10   -2     700  16     10    0     700  16


*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            SW  31   SW  41
SMITHERS              S   44   SW  41

TODAY'S VENTING: GOOD AT HIGHER ELEVATIONS POOR IN THE VALLEYS

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      9    7     100  11     31   10     300  11

FRASER VLY   QUIL      9    7      50  11     30    9     250  11

SRN VRISL    QUIL     16    7     150   5     22   10     300   5

CNTRL VRISL  QUIL     16    7     150   5     47    8     750   5

NRN VRISL    HRDY     92    7     650  24     50    9    1000  14

TERRACE      ANT      10    2     200  16     57    4     750  15

STEWART      ANT      24    5     200   8     59    4     500   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    VR   5   VR   5   NW  11
PORT HARDY   S   28   SW  28   SW  31
SANDSPIT     S   63   SW  63   SW  61

TODAY'S VENTING: FAIR IN THE SOUTH GOOD IN THE NORTH

VENTING FOR THURSDAY: FAIR

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


END/PJS