FPCN39 CWLW 061433
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 TUESDAY 6 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       9   -4     200   2      9   -2     200   2
KAMLOOPS     KEL       9   -1     350   2     12    1     500   2
OKANAGAN     KEL      11    0     450   2     13    2     550   2
CASTLEGAR    SPOK      9    2     500  13      9    3     500  13
CRANBROOK    SPOK      9   -1    1000  13      9    1    1000  13
REVELSTOKE   KEL       9   -1     450   2     10    0     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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  24   SW  59
CRANBROOK             SW  22   SW  69

TODAY'S VENTING: POOR

VENTING FOR WEDNESDAY: 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.     25  -10    1150  10     33   -9    1200  10
PR. GEORGE   P.G.     13  -13     800   5     29  -11     950   8
SMITHERS     P.G.      9  -14     500   1     15  -12     700   3
WELLS GRAY   P.G.     23  -12    1150  10     28  -10    1200  10
FT NLSN      F.N.     19  -26     800   3     19  -26     800   3
FT STJOHN    F.N.     42  -22    1300   6     42  -22    1300   6

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   SW  35
SMITHERS              SW  26   W   35

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR WEDNESDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    5     100   7     14    6     150   7
FRASER VLY   QUIL      9    4      50   7      9    5      50   7
SRN VRISL    QUIL      9    5       0   5     12    6     100   5
CNTRL VRISL  QUIL      9    2      50   5      9    3      50   5
NRN VRISL    HRDY      9    1       0   5      9    2       0   5
TERRACE      ANT       9   -9     200  12     12   -7     250  10
STEWART      ANT       9   -6       0   4     28   -3     400   4

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  11   W   20   W   39
PORT HARDY   W   22   W   30   W   39
SANDSPIT     W   20   W   30   W   43

TODAY'S VENTING: POOR

VENTING FOR WEDNESDAY: POOR

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


END/MWSO