FPCN39 CWLW 261340
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 MONDAY 26 JANUARY 1998 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      55    7     500  20     55    7     500  20
KAMLOOPS     KEL      55    6     700  15     55    6     700  15
OKANAGAN     KEL      12    3     450   2     12    5     500   2
CASTLEGAR    SPOK      9    3     500   6      9    4     500   6
CRANBROOK    SPOK      9    2     950  32      9    4     950  32
REVELSTOKE   KEL      10    3     500   2     10    4     500   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  26   SW  50
CRANBROOK             W   17   W   50

TODAY'S VENTING: POOR EXCEPT GOOD NORTHWESTERN SECTIONS.

VENTING FOR TUESDAY: 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.     10    3     950  36    100    4    1550  26
PR. GEORGE   P.G.     11    5     700  29    100    6    1500  19
SMITHERS     P.G.      9    3     500  20    100    4    1500  20
WELLS GRAY   P.G.    100    5    1650  39    100    5    1650  29
FT NLSN      F.N.     16  -15     550   4     20  -13     750   3
FT STJOHN    F.N.     54   -1    1050  16     63    1    1150  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  56   SW  61
SMITHERS              SW  63   SW  61

TODAY'S VENTING: GOOD EXCEPT POOR IN FORT NELSON.

VENTING FOR TUESDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100  31    100   11     650  31
FRASER VLY   QUIL     16   10     100  13     76   11     500  22
SRN VRISL    QUIL     32   11     200  13    100   12     950  25
CNTRL VRISL  QUIL      9    9      50  12    100    9     850  25
NRN VRISL    HRDY      9    8       0  26     89    9     400  26
TERRACE      ANT       9    3     200  34     89    5     700  34
STEWART      ANT       9    6       0  13     89    5     700  30

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  33   SW  46   SW  59
PORT HARDY   S   50   SW  59   SW  59
SANDSPIT     SW  80   SW  80   SW  76

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR.




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


END/JDG