FPCN39 CWLW 221346
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 22 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      39    2     200  15     45    5     900  15
KAMLOOPS     KEL       9    1     350   2     31    2     950  12
OKANAGAN     KEL      11    2     450   2     35    4     900  12
CASTLEGAR    SPOK      9    2     500   2     29    2     900  12
CRANBROOK    SPOK     10    0     950   8     30    1     950   8
REVELSTOKE   KEL      10    2     500   2     10    3     900   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   30   S   67
CRANBROOK             S    9   S   24

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.     23  -10    1300   4     28   -8    1400   8
PR. GEORGE   P.G.     12  -13     750   4     27  -12    1050   8
SMITHERS     P.G.      9  -12     500   0      9  -11     500   5
WELLS GRAY   P.G.      9  -18     900   3     27   -8    1400   9
FT NLSN      F.N.      9  -23     650   0      9  -22     750   5
FT STJOHN    F.N.     43  -19    1300  15     57  -16    1600  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  31   S   11
SMITHERS              E   35   E   11

TODAY'S VENTING: POOR TO GOOD


VENTING FOR SATURDAY: POOR TO FAIR



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     41    6     350  13     59    7     600  13
FRASER VLY   QUIL     22    6     250   7     42    6     250   7
SRN VRISL    QUIL     44    7     450  10     65    8     650  12
CNTRL VRISL  QUIL     44    7     450  10     45    7     450  10
NRN VRISL    HRDY      9    3       0   4     61    4     300   5
TERRACE      ANT      10   -9     250  14     73   -7    1000  12
STEWART      ANT      10   -9     250  14     71   -7      50   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    E   28   SE  33   SE  33
PORT HARDY   N   30   VR   5   S   19
SANDSPIT     N   59   N   61   NE  63

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SATURDAY:  FAIR 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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