FPCN39 CWLW 271429
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 27 JANUARY 1999 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      18   -1     600   2     43    1    1050   5
KAMLOOPS     KEL      14   -3     600   2     46    0    1200   5
OKANAGAN     KEL      13   -4     500   2     39   -2     700   3
CASTLEGAR    SPOK     18   -4     800   3     22   -1     900   4
CRANBROOK    SPOK      9   -9     950   6      9   -5     950   6
REVELSTOKE   KEL      11   -5     500   2     16   -3     700   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   SW  35   W   89
CRANBROOK             SW  24   W   78

TODAY'S VENTING:  POOR BECOMING FAIR THIS AFTERNOON IN WESTERN
 SECTIONS.

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.     92   -4    1300  41    100   -2    1400  41
PR. GEORGE   P.G.    100   -2    1250  33    100   -1    1350  33
SMITHERS     P.G.     88   -2    1150  21    100   -1    1250  25
WELLS GRAY   P.G.     78   -3    1050  20    100   -2    1450  41
FT NLSN      F.N.      9  -14     400   5      9  -15     400   5
FT STJOHN    F.N.     25   -9     800  13     25   -9     800  13

*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  37   W   43
SMITHERS              SW  31   SW  43

TODAY'S VENTING: GOOD EXCEPT POOR IN NORTHERN SECTIONS.

VENTING FOR THURSDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     63    6     450  20    100    9    1550  25
FRASER VLY   QUIL     59    6     400  20    100    8    1150  24
SRN VRISL    QUIL     79    7     650  18    100   10    1650  23
CNTRL VRISL  QUIL     50    6     350  15     81    7     650  18
NRN VRISL    HRDY     37    4     500   7     72    6     800  12
TERRACE      ANT       9   -1     200  14     10    0     200  14
STEWART      ANT       9   -1     200  16      9    0     200  15

*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    SW  52   SW  74   W   74
PORT HARDY   W   43   W   59   SW  70
SANDSPIT     W   48   W   54   W   52

TODAY'S VENTING: GOOD EXCEPT POOR IN NORTHERN INLAND SECTIONS.

VENTING FOR THURSDAY: GOOD.

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


END/LEC