FPCN39 CWLW 081418
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 8 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   -5     200   3     29   -5     200  11
KAMLOOPS     KEL      49   -4     350  20     59   -4     350  20
OKANAGAN     KEL       9   -5     350   3     39   -4     350  11
CASTLEGAR    SPOK      9   -4     500   5     21   -2     750   5
CRANBROOK    SPOK      9   -9    1000   5     20   -8    1100   5
REVELSTOKE   KEL       9   -8     450   3      9   -8     450   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   N   19   N   30
CRANBROOK             VR   5   NW  17

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR FRIDAY: POOR TO 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.     46  -15    1300  12     36  -15    1300  12
PR. GEORGE   P.G.      9  -19     700   7     30  -16    1000   8
SMITHERS     P.G.     10  -17     600   1      9  -18     500   1
WELLS GRAY   P.G.     61  -12    1550  12     25  -11    1650  12
FT NLSN      F.N.      9  -28     900   3     12  -20     950   4
FT STJOHN    F.N.      9  -25     900   3     12  -20     950   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   NW  20
SMITHERS              N   28   N   20

TODAY'S VENTING: POOR.

VENTING FOR FRIDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     13    1     150   5     17    3     250   5
FRASER VLY   QUIL      9    0      50   5      9    1      50   5
SRN VRISL    QUIL     13    2     150   3     54    6     650   9
CNTRL VRISL  QUIL      9    1     150   0     13    2     150   3
NRN VRISL    HRDY      9    0       0  11     76    3     750  14
TERRACE      ANT       9  -13     200  10      9  -12     200  10
STEWART      ANT      11   -7      50   4      9  -12       0   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NE  15   N   22   N   37
PORT HARDY   N   17   N   30   N   48
SANDSPIT     NE  37   N   43   N   46

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR FRIDAY: POOR TO GOOD.




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


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