FPCN39 CWLW 151402
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 15 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       9    6     200  15     65    7    1800   5
KAMLOOPS     KEL       9    0     350   2     65    4    1800   5
OKANAGAN     KEL       9    3     350   2     65    5    1800   5
CASTLEGAR    SPOK      9    2     500  13      9    4     500  13
CRANBROOK    SPOK     48    2    1100  26    100    2    1600  26
REVELSTOKE   KEL       9    1     450   2      9    2     450   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    VR   5   SW  15   SW  30
CRANBROOK             W   15   W   43

TODAY'S VENTING: good locally poor.

VENTING FOR SATURDAY: 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.     10   -2     950  29    100    1    1800  33
PR. GEORGE   P.G.      9    0     700  22    100    1    2000  33
SMITHERS     P.G.      9    0     500   4    100    1    2000  35
WELLS GRAY   P.G.      9   -2    1000  15    100    1    2000  35
FT NLSN      F.N.      9   -8     400   7      9   -6     400   7
FT STJOHN    F.N.     11    2     700  32    100    3    2000  35

*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            W   31   W   41
SMITHERS              SW  26   SW  41

TODAY'S VENTING: good.

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     23    6     300   7    100    9    1400  18
FRASER VLY   QUIL     22    6     250   7     91    8     900  17
SRN VRISL    QUIL     19    6     200   5    100    9    1150  15
CNTRL VRISL  QUIL     15    5     150   5     79    8     800  14
NRN VRISL    HRDY     34    4     500   6     79    8     800  14
TERRACE      ANT       9    3     200  18      9    3     200  18
STEWART      ANT       9    3       0   4      9    3       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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  20   S   24   SW  33
PORT HARDY   SE  39   S   52   S   46
SANDSPIT     S   33   S   37   S   35

TODAY'S VENTING: good.

VENTING FOR SATURDAY: fair.


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


END/mwso