FPCN39 CWLW 141353
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 14 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     100    9    1200  30    100    9    1200  30
KAMLOOPS     KEL      43    6     700  11     91    9    1500  13
OKANAGAN     KEL      14    4     450   4     43    6     700  11
CASTLEGAR    SPOK      9    2     500   9      9    4     500   9
CRANBROOK    SPOK      9    2     950  15      9    4     950  15
REVELSTOKE   KEL       9    2     450   4     10    3     450   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
PENTICTON    SW  13   W   37   W   80
CRANBROOK             W   30   W   87

TODAY'S VENTING: fair 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.     58    3    1050  47    100    5    1400  48
PR. GEORGE   P.G.     88    4    1050  39     92    5    1050  39
SMITHERS     P.G.      9    2     500  15      9    4     500  15
WELLS GRAY   P.G.    100    6    1600  48    100    6    1600  48
FT NLSN      F.N.      9   -9     400   5     17   -6     500   6
FT STJOHN    F.N.     33    3     850  15     39    4     900  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   57   W   76
SMITHERS              W   46   W   76

TODAY'S VENTING: good except in the northwest Central Interior
and the Northeast.

VENTING FOR FRIDAY: poor to fair.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15    9     100  17     39   10     300  17
FRASER VLY   QUIL      9    8      50  17     38   10     250  17
SRN VRISL    QUIL     31   10     200  15     72   11     350  28
CNTRL VRISL  QUIL      9    9      50  12     32   10     200  15
NRN VRISL    HRDY     11    7     150   1     11    8     250   1
TERRACE      ANT       9    2     200  15      9    4     200  15
STEWART      ANT       9    4       0  16      9    4       0  16

*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    W   50   W   67   W   69
PORT HARDY   W   50   W   65   W   61
SANDSPIT     W   54   W   61   W   61

TODAY'S VENTING: generally fair.

VENTING FOR FRIDAY: fair.


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


END/mwso