FPCN39 CWLW 151459
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 15 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      64    4     850  11     78    5    1100  12
KAMLOOPS     KEL      18    1     500   5     75    1    1900  12
OKANAGAN     KEL       9   -1     350   5     65    1    1500  10
CASTLEGAR    SPOK      9    0     500  20     80   -2    1500  20
CRANBROOK    SPOK      9    0     950  33     80    0    1950  33
REVELSTOKE   KEL       9   -5     450   5     25   -4     650   5

*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    SW   9   W   19   W   33
CRANBROOK             W   19   NW  52

TODAY'S VENTING: Good.


VENTING FOR FRIDAY: 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.     49   -1    1300  14     79   -2    1200  14
PR. GEORGE   P.G.      9   -7     700  10     19   -6     900  10
SMITHERS     P.G.      9   -8     500   3      9   -8     500   3
WELLS GRAY   P.G.      9   -5    1000  14      9   -4    1000  14
FT NLSN      F.N.     10  -28     550   1     25  -24    1000   3
FT STJOHN    F.N.     27  -23    1150   4     34  -20    1300   5

*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            W   26   W   37
SMITHERS              SW  22   SW  37

TODAY'S VENTING: Generally 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      9    7     100  28     80    8    1400  28
FRASER VLY   QUIL      9    5      50  17     80    5    1550  17
SRN VRISL    QUIL     21    8     100  17     80    9    1250  17
CNTRL VRISL  QUIL      9    4      50  17     80    5    1250  17
NRN VRISL    HRDY     10    5       0  20     80    6    1200  20
TERRACE      ANT       9   -6     200   0     70   -6    1200   0
STEWART      ANT      11    0      50   3      9   -6       0   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
VANCOUVER    S   19   SW  20   SW  26
PORT HARDY   S   33   S   35   S   31
SANDSPIT     S   33   S   33   S   31

TODAY'S VENTING: GOOD.


VENTING FOR FRIDAY: POOR


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


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