FPCN39 CWLW 091415
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 FRIDAY 9 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      15   -9     500   2     23   -5     750   3
KAMLOOPS     KEL      13   -9     550   2     42   -5    1600   3
OKANAGAN     KEL      13   -9     550   2     42   -5    1600   3
CASTLEGAR    SPOK     21   -6     900   3     25   -3    1050   3
CRANBROOK    SPOK      9  -11     950   8      9   -8     950   8
REVELSTOKE   KEL      25   -7    1050   3     40   -6    1600   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W    9   W   30
CRANBROOK             VR   5   SW   9

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR SATURDAY: 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.     16  -19    1050   7     22  -18    1150   7
PR. GEORGE   P.G.     30  -17    1000  11     30  -17    1000  11
SMITHERS     P.G.      9  -21     500   1      9  -18     500   1
WELLS GRAY   P.G.      9  -15    1500   5      9  -15    1000   7
FT NLSN      F.N.      9  -32     400   0      9  -34     400   0
FT STJOHN    F.N.      9  -25    1000   0      9  -25    1000   0

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  28   NE  17
SMITHERS              E   33   NE  17

TODAY'S VENTING: POOR.


VENTING FOR SATURDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   -1     100   6     25    3     350   6
FRASER VLY   QUIL      9   -2      50   6     22    1     300   6
SRN VRISL    QUIL     15    0     150   5     26    4     350   5
CNTRL VRISL  QUIL     15    0     150   5     20    1     250   5
NRN VRISL    HRDY      9   -2       0   9     30    1     550  10
TERRACE      ANT      49  -14     200  20     49  -13     200  22
STEWART      ANT       9   -9       0   6      9  -13       0   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NW  24   NW  61
PORT HARDY   N   19   NW  39   NW  67
SANDSPIT     NE  31   N   39   N   54

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR SATURDAY: POOR TO FAIR.




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


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